diff --git a/lib/js/Gruntfile.js b/lib/js/Gruntfile.js
index b32a016..87b826f 100644
--- a/lib/js/Gruntfile.js
+++ b/lib/js/Gruntfile.js
@@ -68,6 +68,16 @@
       ThriftGenDeepConstructor: {
         command: '../../compiler/cpp/thrift -gen js -o test ../../test/JsDeepConstructorTest.thrift'
       },
+      ThriftBrowserifyNodeInt64: {
+        command: [
+          './node_modules/browserify/bin/cmd.js ./node_modules/node-int64/Int64.js -s Int64 -o test/build/js/lib/Int64.js',
+          './node_modules/browserify/bin/cmd.js ../nodejs/lib/thrift/int64_util.js -s Int64Util -o test/build/js/lib/Int64Util.js',
+          './node_modules/browserify/bin/cmd.js ./node_modules/json-int64/index.js -s JSONInt64 -o test/build/js/lib/JSONInt64.js'
+        ].join(' && ')
+      },
+      ThriftGenInt64: {
+        command: '../../compiler/cpp/thrift -gen js -o test ../../test/Int64Test.thrift'
+      },
       ThriftGenDoubleConstants: {
         command: '../../compiler/cpp/thrift -gen js -o test ../../test/DoubleConstantsTest.thrift'
       },
@@ -147,6 +157,18 @@
           },
         }
       },
+      ThriftJS_Int64: {
+        options: {
+          urls: [
+            'http://localhost:8089/test-int64.html'
+          ],
+          puppeteer: {
+            headless: true,
+            args: ['--no-sandbox'],
+            ignoreHTTPSErrors: true,
+          },
+        }
+      },
       ThriftWS: {
         options: {
           urls: [
@@ -218,7 +240,7 @@
       }
     },
     jshint: {
-      // The main thrift library file. not es6 yet :(
+      // The main Thrift library file. not es6 yet :(
       lib: {
         src: ['src/**/*.js'],
       },
@@ -261,7 +283,7 @@
   grunt.loadNpmTasks('grunt-jsdoc');
   grunt.loadNpmTasks('grunt-shell-spawn');
 
-  grunt.registerTask('wait', 'Wait just one second for server to start', function () {
+  grunt.registerTask('wait', 'Wait just one second for the server to start', function () {
     var done = this.async();
     setTimeout(function() {
       done(true);
@@ -269,25 +291,37 @@
   });
 
   grunt.registerTask('installAndGenerate', [
-    'shell:InstallThriftJS', 'shell:InstallThriftNodeJSDep', 'shell:ThriftGen',
-    'shell:ThriftGenDeepConstructor', 'shell:ThriftGenDoubleConstants',
+    'shell:InstallThriftJS',
+    'shell:InstallThriftNodeJSDep',
+    'shell:ThriftGen',
+    'shell:ThriftGenDeepConstructor',
+    'shell:ThriftGenDoubleConstants',
     'shell:InstallTestLibs',
+    'shell:ThriftBrowserifyNodeInt64',
+    'shell:ThriftGenInt64'
   ]);
 
   grunt.registerTask('test', [
     'installAndGenerate',
     'jshint',
-    'shell:ThriftTestServer', 'shell:ThriftTestServer_TLS',
-    'shell:ThriftTestServerES6', 'shell:ThriftTestServerES6_TLS',
+    'shell:ThriftTestServer',
+    'shell:ThriftTestServer_TLS',
+    'shell:ThriftTestServerES6',
+    'shell:ThriftTestServerES6_TLS',
     'wait',
     'qunit:ThriftDeepConstructor',
-    'qunit:ThriftJS', 'qunit:ThriftJS_TLS',
+    'qunit:ThriftJS',
+    'qunit:ThriftJS_TLS',
     'qunit:ThriftJS_DoubleRendering',
     'qunit:ThriftWS',
-    'qunit:ThriftJSJQ', 'qunit:ThriftJSJQ_TLS',
+    'qunit:ThriftJSJQ',
+    'qunit:ThriftJSJQ_TLS',
     'qunit:ThriftWSES6',
-    'shell:ThriftTestServer:kill', 'shell:ThriftTestServer_TLS:kill',
-    'shell:ThriftTestServerES6:kill', 'shell:ThriftTestServerES6_TLS:kill',
+    'qunit:ThriftJS_Int64',
+    'shell:ThriftTestServer:kill',
+    'shell:ThriftTestServer_TLS:kill',
+    'shell:ThriftTestServerES6:kill',
+    'shell:ThriftTestServerES6_TLS:kill',
   ]);
   grunt.registerTask('default', ['test', 'concat', 'uglify', 'jsdoc']);
 };
diff --git a/lib/js/README.md b/lib/js/README.md
index 9d51e2a..5c7a1c2 100644
--- a/lib/js/README.md
+++ b/lib/js/README.md
@@ -138,3 +138,8 @@
 
     thrift --gen js:ts file.thrift
 
+# Breaking Changes
+
+## 0.13.0
+
+1. 64-bit integer constants are now generatd using node-int64 e.g.: var x = new Int64("7fffffffffffffff");
diff --git a/lib/js/package-lock.json b/lib/js/package-lock.json
index 63d81c3..19710df 100644
--- a/lib/js/package-lock.json
+++ b/lib/js/package-lock.json
@@ -4,11 +4,51 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "JSONStream": {
+      "version": "1.3.5",
+      "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.5.tgz",
+      "integrity": "sha512-E+iruNOY8VV9s4JEbe1aNEm6MiszPRr/UfcHMz0TQh1BXSxHK+ASV1R6W4HpjBhSeS+54PIsAMCBmwD06LLsqQ==",
+      "dev": true,
+      "requires": {
+        "jsonparse": "^1.2.0",
+        "through": ">=2.2.7 <3"
+      }
+    },
     "abbrev": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
       "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q=="
     },
+    "acorn": {
+      "version": "6.0.4",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.0.4.tgz",
+      "integrity": "sha512-VY4i5EKSKkofY2I+6QLTbTTN/UvEQPCo6eiwzzSaSWfpaDhOmStMCMod6wmuPciNq+XS0faCglFu2lHZpdHUtg==",
+      "dev": true
+    },
+    "acorn-dynamic-import": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/acorn-dynamic-import/-/acorn-dynamic-import-4.0.0.tgz",
+      "integrity": "sha512-d3OEjQV4ROpoflsnUA8HozoIR504TFxNivYEUi6uwz0IYhBkTDXGuWlNdMtybRt3nqVx/L6XqMt0FxkXuWKZhw==",
+      "dev": true
+    },
+    "acorn-node": {
+      "version": "1.6.2",
+      "resolved": "https://registry.npmjs.org/acorn-node/-/acorn-node-1.6.2.tgz",
+      "integrity": "sha512-rIhNEZuNI8ibQcL7ANm/mGyPukIaZsRNX9psFNQURyJW0nu6k8wjSDld20z6v2mDBWqX13pIEnk9gGZJHIlEXg==",
+      "dev": true,
+      "requires": {
+        "acorn": "^6.0.2",
+        "acorn-dynamic-import": "^4.0.0",
+        "acorn-walk": "^6.1.0",
+        "xtend": "^4.0.1"
+      }
+    },
+    "acorn-walk": {
+      "version": "6.1.1",
+      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-6.1.1.tgz",
+      "integrity": "sha512-OtUw6JUTgxA2QoqqmrmQ7F2NYqiBPi/L2jqHyFtllhOUvXYQXf0Z1CYUinIfyT4bTCGmrA7gX9FvHA81uzCoVw==",
+      "dev": true
+    },
     "agent-base": {
       "version": "4.2.1",
       "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-4.2.1.tgz",
@@ -109,12 +149,30 @@
       "integrity": "sha1-p5SvDAWrF1KEbudTofIRoFugxE8=",
       "dev": true
     },
+    "array-filter": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/array-filter/-/array-filter-0.0.1.tgz",
+      "integrity": "sha1-fajPLiZijtcygDWB/SH2fKzS7uw=",
+      "dev": true
+    },
     "array-find-index": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/array-find-index/-/array-find-index-1.0.2.tgz",
       "integrity": "sha1-3wEKoSh+Fku9pvlyOwqWoexBh6E=",
       "dev": true
     },
+    "array-map": {
+      "version": "0.0.0",
+      "resolved": "https://registry.npmjs.org/array-map/-/array-map-0.0.0.tgz",
+      "integrity": "sha1-iKK6tz0c97zVwbEYoAP2b2ZfpmI=",
+      "dev": true
+    },
+    "array-reduce": {
+      "version": "0.0.0",
+      "resolved": "https://registry.npmjs.org/array-reduce/-/array-reduce-0.0.0.tgz",
+      "integrity": "sha1-FziZ0//Rx9k4PkR5Ul2+J4yrXys=",
+      "dev": true
+    },
     "array-slice": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/array-slice/-/array-slice-1.1.0.tgz",
@@ -137,6 +195,43 @@
         "safer-buffer": "~2.1.0"
       }
     },
+    "asn1.js": {
+      "version": "4.10.1",
+      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-4.10.1.tgz",
+      "integrity": "sha512-p32cOF5q0Zqs9uBiONKYLm6BClCoBCM5O9JfeUSlnQLBTxYdTK+pW+nXflm8UkKd2UYlEbYz5qEi0JuZR9ckSw==",
+      "dev": true,
+      "requires": {
+        "bn.js": "^4.0.0",
+        "inherits": "^2.0.1",
+        "minimalistic-assert": "^1.0.0"
+      }
+    },
+    "assert": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/assert/-/assert-1.4.1.tgz",
+      "integrity": "sha1-mZEtWRg2tab1s0XA8H7vwI/GXZE=",
+      "dev": true,
+      "requires": {
+        "util": "0.10.3"
+      },
+      "dependencies": {
+        "inherits": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.1.tgz",
+          "integrity": "sha1-sX0I0ya0Qj5Wjv9xn5GwscvfafE=",
+          "dev": true
+        },
+        "util": {
+          "version": "0.10.3",
+          "resolved": "http://registry.npmjs.org/util/-/util-0.10.3.tgz",
+          "integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=",
+          "dev": true,
+          "requires": {
+            "inherits": "2.0.1"
+          }
+        }
+      }
+    },
     "assert-plus": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
@@ -254,6 +349,12 @@
         }
       }
     },
+    "base64-js": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.3.0.tgz",
+      "integrity": "sha512-ccav/yGvoa80BQDljCxsmmQ3Xvx60/UpBIij5QN21W3wBi/hhIC9OoO+KLpu9IJTS9j4DRVJ3aDDF9cMSoa2lw==",
+      "dev": true
+    },
     "bcrypt-pbkdf": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
@@ -269,6 +370,12 @@
       "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.5.2.tgz",
       "integrity": "sha512-dhHTWMI7kMx5whMQntl7Vr9C6BvV10lFXDAasnqnrMYhXVCzzk6IO9Fo2L75jXHT07WrOngL1WDXOp+yYS91Yg=="
     },
+    "bn.js": {
+      "version": "4.11.8",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.8.tgz",
+      "integrity": "sha512-ItfYfPLkWHUjckQCk8xC+LwxgK8NYcXywGigJgSwOP8Y2iyWT4f2vsZnoOXTTbo+o5yXmIUJ4gn5538SO5S3gA==",
+      "dev": true
+    },
     "brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -308,6 +415,219 @@
         }
       }
     },
+    "brorand": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/brorand/-/brorand-1.1.0.tgz",
+      "integrity": "sha1-EsJe/kCkXjwyPrhnWgoM5XsiNx8=",
+      "dev": true
+    },
+    "browser-pack": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/browser-pack/-/browser-pack-6.1.0.tgz",
+      "integrity": "sha512-erYug8XoqzU3IfcU8fUgyHqyOXqIE4tUTTQ+7mqUjQlvnXkOO6OlT9c/ZoJVHYoAaqGxr09CN53G7XIsO4KtWA==",
+      "dev": true,
+      "requires": {
+        "JSONStream": "^1.0.3",
+        "combine-source-map": "~0.8.0",
+        "defined": "^1.0.0",
+        "safe-buffer": "^5.1.1",
+        "through2": "^2.0.0",
+        "umd": "^3.0.0"
+      }
+    },
+    "browser-resolve": {
+      "version": "1.11.3",
+      "resolved": "https://registry.npmjs.org/browser-resolve/-/browser-resolve-1.11.3.tgz",
+      "integrity": "sha512-exDi1BYWB/6raKHmDTCicQfTkqwN5fioMFV4j8BsfMU4R2DK/QfZfK7kOVkmWCNANf0snkBzqGqAJBao9gZMdQ==",
+      "dev": true,
+      "requires": {
+        "resolve": "1.1.7"
+      }
+    },
+    "browserify": {
+      "version": "16.2.3",
+      "resolved": "https://registry.npmjs.org/browserify/-/browserify-16.2.3.tgz",
+      "integrity": "sha512-zQt/Gd1+W+IY+h/xX2NYMW4orQWhqSwyV+xsblycTtpOuB27h1fZhhNQuipJ4t79ohw4P4mMem0jp/ZkISQtjQ==",
+      "dev": true,
+      "requires": {
+        "JSONStream": "^1.0.3",
+        "assert": "^1.4.0",
+        "browser-pack": "^6.0.1",
+        "browser-resolve": "^1.11.0",
+        "browserify-zlib": "~0.2.0",
+        "buffer": "^5.0.2",
+        "cached-path-relative": "^1.0.0",
+        "concat-stream": "^1.6.0",
+        "console-browserify": "^1.1.0",
+        "constants-browserify": "~1.0.0",
+        "crypto-browserify": "^3.0.0",
+        "defined": "^1.0.0",
+        "deps-sort": "^2.0.0",
+        "domain-browser": "^1.2.0",
+        "duplexer2": "~0.1.2",
+        "events": "^2.0.0",
+        "glob": "^7.1.0",
+        "has": "^1.0.0",
+        "htmlescape": "^1.1.0",
+        "https-browserify": "^1.0.0",
+        "inherits": "~2.0.1",
+        "insert-module-globals": "^7.0.0",
+        "labeled-stream-splicer": "^2.0.0",
+        "mkdirp": "^0.5.0",
+        "module-deps": "^6.0.0",
+        "os-browserify": "~0.3.0",
+        "parents": "^1.0.1",
+        "path-browserify": "~0.0.0",
+        "process": "~0.11.0",
+        "punycode": "^1.3.2",
+        "querystring-es3": "~0.2.0",
+        "read-only-stream": "^2.0.0",
+        "readable-stream": "^2.0.2",
+        "resolve": "^1.1.4",
+        "shasum": "^1.0.0",
+        "shell-quote": "^1.6.1",
+        "stream-browserify": "^2.0.0",
+        "stream-http": "^2.0.0",
+        "string_decoder": "^1.1.1",
+        "subarg": "^1.0.0",
+        "syntax-error": "^1.1.1",
+        "through2": "^2.0.0",
+        "timers-browserify": "^1.0.1",
+        "tty-browserify": "0.0.1",
+        "url": "~0.11.0",
+        "util": "~0.10.1",
+        "vm-browserify": "^1.0.0",
+        "xtend": "^4.0.0"
+      },
+      "dependencies": {
+        "browserify-zlib": {
+          "version": "0.2.0",
+          "resolved": "https://registry.npmjs.org/browserify-zlib/-/browserify-zlib-0.2.0.tgz",
+          "integrity": "sha512-Z942RysHXmJrhqk88FmKBVq/v5tqmSkDz7p54G/MGyjMnCFFnC79XWNbg+Vta8W6Wb2qtSZTSxIGkJrRpCFEiA==",
+          "dev": true,
+          "requires": {
+            "pako": "~1.0.5"
+          }
+        },
+        "glob": {
+          "version": "7.1.3",
+          "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.3.tgz",
+          "integrity": "sha512-vcfuiIxogLV4DlGBHIUOwI0IbrJ8HWPc4MU7HzviGeNho/UJDfi6B5p3sHeWIQ0KGIU0Jpxi5ZHxemQfLkkAwQ==",
+          "dev": true,
+          "requires": {
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
+            "once": "^1.3.0",
+            "path-is-absolute": "^1.0.0"
+          }
+        },
+        "pako": {
+          "version": "1.0.7",
+          "resolved": "https://registry.npmjs.org/pako/-/pako-1.0.7.tgz",
+          "integrity": "sha512-3HNK5tW4x8o5mO8RuHZp3Ydw9icZXx0RANAOMzlMzx7LVXhMJ4mo3MOBpzyd7r/+RUu8BmndP47LXT+vzjtWcQ==",
+          "dev": true
+        },
+        "readable-stream": {
+          "version": "2.3.6",
+          "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
+          "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
+          "dev": true,
+          "requires": {
+            "core-util-is": "~1.0.0",
+            "inherits": "~2.0.3",
+            "isarray": "~1.0.0",
+            "process-nextick-args": "~2.0.0",
+            "safe-buffer": "~5.1.1",
+            "string_decoder": "~1.1.1",
+            "util-deprecate": "~1.0.1"
+          },
+          "dependencies": {
+            "string_decoder": {
+              "version": "1.1.1",
+              "resolved": "http://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+              "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+              "dev": true,
+              "requires": {
+                "safe-buffer": "~5.1.0"
+              }
+            }
+          }
+        },
+        "string_decoder": {
+          "version": "1.2.0",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.2.0.tgz",
+          "integrity": "sha512-6YqyX6ZWEYguAxgZzHGL7SsCeGx3V2TtOTqZz1xSTSWnqsbWwbptafNyvf/ACquZUXV3DANr5BDIwNYe1mN42w==",
+          "dev": true,
+          "requires": {
+            "safe-buffer": "~5.1.0"
+          }
+        }
+      }
+    },
+    "browserify-aes": {
+      "version": "1.2.0",
+      "resolved": "http://registry.npmjs.org/browserify-aes/-/browserify-aes-1.2.0.tgz",
+      "integrity": "sha512-+7CHXqGuspUn/Sl5aO7Ea0xWGAtETPXNSAjHo48JfLdPWcMng33Xe4znFvQweqc/uzk5zSOI3H52CYnjCfb5hA==",
+      "dev": true,
+      "requires": {
+        "buffer-xor": "^1.0.3",
+        "cipher-base": "^1.0.0",
+        "create-hash": "^1.1.0",
+        "evp_bytestokey": "^1.0.3",
+        "inherits": "^2.0.1",
+        "safe-buffer": "^5.0.1"
+      }
+    },
+    "browserify-cipher": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/browserify-cipher/-/browserify-cipher-1.0.1.tgz",
+      "integrity": "sha512-sPhkz0ARKbf4rRQt2hTpAHqn47X3llLkUGn+xEJzLjwY8LRs2p0v7ljvI5EyoRO/mexrNunNECisZs+gw2zz1w==",
+      "dev": true,
+      "requires": {
+        "browserify-aes": "^1.0.4",
+        "browserify-des": "^1.0.0",
+        "evp_bytestokey": "^1.0.0"
+      }
+    },
+    "browserify-des": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/browserify-des/-/browserify-des-1.0.2.tgz",
+      "integrity": "sha512-BioO1xf3hFwz4kc6iBhI3ieDFompMhrMlnDFC4/0/vd5MokpuAc3R+LYbwTA9A5Yc9pq9UYPqffKpW2ObuwX5A==",
+      "dev": true,
+      "requires": {
+        "cipher-base": "^1.0.1",
+        "des.js": "^1.0.0",
+        "inherits": "^2.0.1",
+        "safe-buffer": "^5.1.2"
+      }
+    },
+    "browserify-rsa": {
+      "version": "4.0.1",
+      "resolved": "http://registry.npmjs.org/browserify-rsa/-/browserify-rsa-4.0.1.tgz",
+      "integrity": "sha1-IeCr+vbyApzy+vsTNWenAdQTVSQ=",
+      "dev": true,
+      "requires": {
+        "bn.js": "^4.1.0",
+        "randombytes": "^2.0.1"
+      }
+    },
+    "browserify-sign": {
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/browserify-sign/-/browserify-sign-4.0.4.tgz",
+      "integrity": "sha1-qk62jl17ZYuqa/alfmMMvXqT0pg=",
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@@ -3052,6 +4021,26 @@
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+      "requires": {
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@@ -3079,6 +4080,12 @@
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@@ -3314,6 +4321,153 @@
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+            "inherits": "~2.0.3",
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+      "requires": {
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+      "dev": true,
+      "requires": {
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+          "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
+          "dev": true,
+          "requires": {
+            "core-util-is": "~1.0.0",
+            "inherits": "~2.0.3",
+            "isarray": "~1.0.0",
+            "process-nextick-args": "~2.0.0",
+            "safe-buffer": "~5.1.1",
+            "string_decoder": "~1.1.1",
+            "util-deprecate": "~1.0.1"
+          }
+        },
+        "string_decoder": {
+          "version": "1.1.1",
+          "resolved": "http://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+          "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+          "dev": true,
+          "requires": {
+            "safe-buffer": "~5.1.0"
+          }
+        }
+      }
+    },
     "string_decoder": {
       "version": "0.10.31",
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
@@ -3352,6 +4506,23 @@
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       "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo="
     },
+    "subarg": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/subarg/-/subarg-1.0.0.tgz",
+      "integrity": "sha1-9izxdYHplrSPyWVpn1TAauJouNI=",
+      "dev": true,
+      "requires": {
+        "minimist": "^1.1.0"
+      },
+      "dependencies": {
+        "minimist": {
+          "version": "1.2.0",
+          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
+          "dev": true
+        }
+      }
+    },
     "supports-color": {
       "version": "5.5.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
@@ -3367,6 +4538,15 @@
       "integrity": "sha1-cX0izFPwzh3vVZQ2LzqJouu5EQU=",
       "dev": true
     },
+    "syntax-error": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/syntax-error/-/syntax-error-1.4.0.tgz",
+      "integrity": "sha512-YPPlu67mdnHGTup2A8ff7BC2Pjq0e0Yp/IyTFN03zWO0RcK07uLcbi7C2KpGR2FvWbaB0+bfE27a+sBKebSo7w==",
+      "dev": true,
+      "requires": {
+        "acorn-node": "^1.2.0"
+      }
+    },
     "taffydb": {
       "version": "2.6.2",
       "resolved": "https://registry.npmjs.org/taffydb/-/taffydb-2.6.2.tgz",
@@ -3383,8 +4563,58 @@
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       "resolved": "http://registry.npmjs.org/through/-/through-2.3.8.tgz",
       "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
+      "dev": true
+    },
+    "through2": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
+      "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
       "dev": true,
-      "optional": true
+      "requires": {
+        "readable-stream": "~2.3.6",
+        "xtend": "~4.0.1"
+      },
+      "dependencies": {
+        "readable-stream": {
+          "version": "2.3.6",
+          "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
+          "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
+          "dev": true,
+          "requires": {
+            "core-util-is": "~1.0.0",
+            "inherits": "~2.0.3",
+            "isarray": "~1.0.0",
+            "process-nextick-args": "~2.0.0",
+            "safe-buffer": "~5.1.1",
+            "string_decoder": "~1.1.1",
+            "util-deprecate": "~1.0.1"
+          }
+        },
+        "string_decoder": {
+          "version": "1.1.1",
+          "resolved": "http://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+          "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+          "dev": true,
+          "requires": {
+            "safe-buffer": "~5.1.0"
+          }
+        }
+      }
+    },
+    "timers-browserify": {
+      "version": "1.4.2",
+      "resolved": "https://registry.npmjs.org/timers-browserify/-/timers-browserify-1.4.2.tgz",
+      "integrity": "sha1-ycWLV1voQHN1y14kYtrO50NZ9B0=",
+      "dev": true,
+      "requires": {
+        "process": "~0.11.0"
+      }
+    },
+    "to-arraybuffer": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/to-arraybuffer/-/to-arraybuffer-1.0.1.tgz",
+      "integrity": "sha1-fSKbH8xjfkZsoIEYCDanqr/4P0M=",
+      "dev": true
     },
     "to-object-path": {
       "version": "0.3.0",
@@ -3445,6 +4675,12 @@
       "integrity": "sha1-WIeWa7WCpFA6QetST301ARgVphM=",
       "dev": true
     },
+    "tty-browserify": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/tty-browserify/-/tty-browserify-0.0.1.tgz",
+      "integrity": "sha512-C3TaO7K81YvjCgQH9Q1S3R3P3BtN3RIM8n+OvX4il1K1zgE8ZhI0op7kClgkxtutIE8hQrcrHBXvIheqKUUCxw==",
+      "dev": true
+    },
     "tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
@@ -3493,12 +4729,30 @@
       "integrity": "sha1-bgkk1r2mta/jSeOabWMoUKD4grc=",
       "dev": true
     },
+    "umd": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/umd/-/umd-3.0.3.tgz",
+      "integrity": "sha512-4IcGSufhFshvLNcMCV80UnQVlZ5pMOC8mvNPForqwA4+lzYQuetTESLDQkeLmihq8bRcnpbQa48Wb8Lh16/xow==",
+      "dev": true
+    },
     "unc-path-regex": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/unc-path-regex/-/unc-path-regex-0.1.2.tgz",
       "integrity": "sha1-5z3T17DXxe2G+6xrCufYxqadUPo=",
       "dev": true
     },
+    "undeclared-identifiers": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/undeclared-identifiers/-/undeclared-identifiers-1.1.2.tgz",
+      "integrity": "sha512-13EaeocO4edF/3JKime9rD7oB6QI8llAGhgn5fKOPyfkJbRb6NFv9pYV6dFEmpa4uRjKeBqLZP8GpuzqHlKDMQ==",
+      "dev": true,
+      "requires": {
+        "acorn-node": "^1.3.0",
+        "get-assigned-identifiers": "^1.2.0",
+        "simple-concat": "^1.0.0",
+        "xtend": "^4.0.1"
+      }
+    },
     "underscore": {
       "version": "1.8.3",
       "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.8.3.tgz",
@@ -3622,12 +4876,39 @@
       "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=",
       "dev": true
     },
+    "url": {
+      "version": "0.11.0",
+      "resolved": "https://registry.npmjs.org/url/-/url-0.11.0.tgz",
+      "integrity": "sha1-ODjpfPxgUh63PFJajlW/3Z4uKPE=",
+      "dev": true,
+      "requires": {
+        "punycode": "1.3.2",
+        "querystring": "0.2.0"
+      },
+      "dependencies": {
+        "punycode": {
+          "version": "1.3.2",
+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.3.2.tgz",
+          "integrity": "sha1-llOgNvt8HuQjQvIyXM7v6jkmxI0=",
+          "dev": true
+        }
+      }
+    },
     "use": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
       "integrity": "sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==",
       "dev": true
     },
+    "util": {
+      "version": "0.10.4",
+      "resolved": "https://registry.npmjs.org/util/-/util-0.10.4.tgz",
+      "integrity": "sha512-0Pm9hTQ3se5ll1XihRic3FDIku70C+iHUdT/W926rSgHV5QgXsYbKZN8MSC3tJtSkhuROzvsQjAaFENRXr+19A==",
+      "dev": true,
+      "requires": {
+        "inherits": "2.0.3"
+      }
+    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@@ -3672,6 +4953,12 @@
         "extsprintf": "^1.2.0"
       }
     },
+    "vm-browserify": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/vm-browserify/-/vm-browserify-1.1.0.tgz",
+      "integrity": "sha512-iq+S7vZJE60yejDYM0ek6zg308+UZsdtPExWP9VZoCFCz1zkJoXFnAX7aZfd/ZwrkidzdUZL0C/ryW+JwAiIGw==",
+      "dev": true
+    },
     "which": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
@@ -3744,6 +5031,12 @@
       "resolved": "https://registry.npmjs.org/xmlcreate/-/xmlcreate-1.0.2.tgz",
       "integrity": "sha1-+mv3YqYKQT+z3Y9LA8WyaSONMI8="
     },
+    "xtend": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
+      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
+      "dev": true
+    },
     "yargs": {
       "version": "3.10.0",
       "resolved": "http://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
diff --git a/lib/js/package.json b/lib/js/package.json
index a59cdc4..c4bcc6d 100644
--- a/lib/js/package.json
+++ b/lib/js/package.json
@@ -2,6 +2,7 @@
   "name": "thrift",
   "version": "1.0.0",
   "devDependencies": {
+    "browserify": "^16.2.3",
     "grunt": "^1.0.2",
     "grunt-cli": "^1.2.0",
     "grunt-contrib-concat": "^1.0.1",
@@ -10,10 +11,12 @@
     "grunt-contrib-uglify": "^1.0.1",
     "grunt-jsdoc": "^2.2.1",
     "grunt-shell-spawn": "^0.3.10",
-    "jslint": "^0.12.0"
+    "jslint": "^0.12.0",
+    "node-int64": "^0.4.0"
   },
   "dependencies": {
     "jsdoc": "^3.5.5",
+    "json-int64": "^0.0.3",
     "nopt": "^4.0.1"
   }
 }
diff --git a/lib/js/src/thrift.js b/lib/js/src/thrift.js
index fad24d6..b9fa62d 100644
--- a/lib/js/src/thrift.js
+++ b/lib/js/src/thrift.js
@@ -1007,7 +1007,11 @@
 
     /** Serializes a number */
     writeI64: function(i64) {
-        this.tstack.push(i64);
+        if (typeof i64 === 'number') {
+            this.tstack.push(i64);
+        } else {
+            this.tstack.push(Int64Util.toDecimalString(i64));
+        }
     },
 
     /** Serializes a number */
@@ -1078,12 +1082,16 @@
         this.rstack = [];
         this.rpos = [];
 
-        if (typeof JSON !== 'undefined' && typeof JSON.parse === 'function') {
-            this.robj = JSON.parse(this.transport.readAll());
+        received = this.transport.readAll();
+
+        if (typeof JSONInt64 !== 'undefined' && typeof JSONInt64.parse === 'function') {
+            this.robj = JSONInt64.parse(received);
+        } else if (typeof JSON !== 'undefined' && typeof JSON.parse === 'function') {
+            this.robj = JSON.parse(received);
         } else if (typeof jQuery !== 'undefined') {
-            this.robj = jQuery.parseJSON(this.transport.readAll());
+            this.robj = jQuery.parseJSON(received);
         } else {
-            this.robj = eval(this.transport.readAll());
+            this.robj = eval(received);
         }
 
         var r = {};
@@ -1226,7 +1234,6 @@
         r.vtype = Thrift.Protocol.RType[map.shift()];
         r.size = map.shift();
 
-
         this.rpos.push(this.rstack.length);
         this.rstack.push(map.shift());
 
@@ -1351,8 +1358,54 @@
 
     /** Returns the an object with a value property set to the
         next value found in the protocol buffer */
-    readI64: function() {
-        return this.readI32();
+    readI64: function(f) {
+        if (f === undefined) {
+            f = this.rstack[this.rstack.length - 1];
+        }
+
+        var r = {};
+
+        if (f instanceof Array) {
+            if (f.length === 0) {
+                r.value = undefined;
+            } else {
+                if (!f.isReversed) {
+                    f.reverse();
+                    f.isReversed = true;
+                }
+                r.value = f.pop();
+            }
+        } else if (f instanceof Object) {
+            var int64Object = true;
+            var objectKeys = Object.keys(f).sort();
+            var int64Keys = ['buffer', 'offset'];
+            if (objectKeys.length !== int64Keys.length) {
+                int64Object = false;
+            }
+            for (var it=0; int64Object && it < objectKeys.length; ++it) {
+                if (objectKeys[it] !== int64Keys[it]) {
+                    int64Object = false;
+                }
+            }
+            if (int64Object) {
+                r.value = f;
+            } else {
+                for (var i in f) {
+                    if (i === null) {
+                    continue;
+                    }
+                    this.rstack.push(f[i]);
+                    delete f[i];
+
+                    r.value = i;
+                    break;
+                }
+            }
+        } else {
+            r.value = f;
+            this.rstack.pop();
+        }
+        return r;
     },
 
     /** Returns the an object with a value property set to the
diff --git a/lib/js/test/build.xml b/lib/js/test/build.xml
index 04c1360..4795fd2 100755
--- a/lib/js/test/build.xml
+++ b/lib/js/test/build.xml
@@ -28,13 +28,13 @@
   <property name="build" location="build" />
   <property name="jar.file" location="${build}/jstest.jar" />
 
-  <!-- the root directory, where you unpack thrift distibution (e.g. thrift-0.x.x.tar.gz) -->
+  <!-- the root directory, where you unpack thrift distibution (e.g.: thrift-0.x.x.tar.gz) -->
   <property name="thrift.dir" location="../../../" />
   <property name="thrift.java.dir" location="${thrift.dir}/lib/java" />
   <property name="build.tools.dir" location="${thrift.java.dir}/build/tools/"/>
   <property file="${basedir}/build.properties"/>
 
-  <!-- Include the base java properties file -->
+  <!-- Include the base Java properties file -->
   <property file="${thrift.java.dir}/gradle.properties" />
 
   <property name="thrift.compiler" location="${thrift.dir}/compiler/cpp/thrift" />
@@ -187,7 +187,6 @@
     -->
     <jsl:jslint options="evil,forin,browser,bitwise,regexp,newcap,immed" encoding="UTF-8">
       <formatter type="plain" />
-      <fileset dir="${genjs}" includes="**/*.js" />
       <fileset dir="../src" includes="thrift.js" />
 
       <!-- issues with unsafe character -->
diff --git a/lib/js/test/test-deep-constructor.html b/lib/js/test/test-deep-constructor.html
index dfc0da6..462481a 100755
--- a/lib/js/test/test-deep-constructor.html
+++ b/lib/js/test/test-deep-constructor.html
@@ -22,6 +22,7 @@
   <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
   <title>Thrift Javascript Bindings: Unit Test</title>
 
+  <script src="build/js/lib/JSONInt64.js" type="text/javascript" charset="utf-8"></script>
   <script src="build/js/thrift.js"         type="text/javascript" charset="utf-8"></script>
   <script src="gen-js/JsDeepConstructorTest_types.js" type="text/javascript" charset="utf-8"></script>
   <!-- jQuery -->
diff --git a/lib/js/test/test-es6.html b/lib/js/test/test-es6.html
index bf04901..f0b8dd9 100644
--- a/lib/js/test/test-es6.html
+++ b/lib/js/test/test-es6.html
@@ -22,6 +22,9 @@
   <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
   <title>Thrift Javascript Bindings: Unit Test</title>
 
+  <script src="build/js/lib/Int64.js" type="text/javascript" charset="utf-8"></script>
+  <script src="build/js/lib/Int64Util.js" type="text/javascript" charset="utf-8"></script>
+  <script src="build/js/lib/JSONInt64.js" type="text/javascript" charset="utf-8"></script>
   <script src="build/js/thrift.js"         type="text/javascript" charset="utf-8"></script>
   <script src="gen-js-es6/ThriftTest_types.js" type="text/javascript" charset="utf-8"></script>
   <script src="gen-js-es6/ThriftTest.js"       type="text/javascript" charset="utf-8"></script>
diff --git a/lib/js/test/test-int64.html b/lib/js/test/test-int64.html
new file mode 100644
index 0000000..620e6ff
--- /dev/null
+++ b/lib/js/test/test-int64.html
@@ -0,0 +1,55 @@
++<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements. See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership. The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License. You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing,
+  software distributed under the License is distributed on an
+  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  KIND, either express or implied. See the License for the
+  specific language governing permissions and limitations
+  under the License.
+-->
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+<head>
+      <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+      <title>Int64 Constants in JS: Unit Test</title>
+
+      <script src="build/js/thrift.js" type="text/javascript" charset="utf-8"></script>
+      <!-- browserified node-int64 -->
+      <script src="build/js/lib/Int64.js" type="text/javascript" charset="utf-8"></script>
+      <!-- int64 constants to check -->
+      <script src="gen-js/Int64Test_types.js" type="text/javascript" charset="utf-8"></script>
+
+      <!-- jQuery -->
+      <script type="text/javascript" src="build/js/lib/jquery.js" charset="utf-8"></script>
+
+      <!-- QUnit Test framework-->
+      <script type="text/javascript" src="build/js/lib/qunit.js" charset="utf-8"></script>
+      <link rel="stylesheet" href="build/js/lib/qunit.css" type="text/css" media="screen" />
+
+      <!-- the Test Suite-->
+      <script type="text/javascript" src="test-int64.js" charset="utf-8"></script>
+    </head>
+<body>
+  <h1 id="qunit-header">Int64 Constants in JS: Unit Test</h1>
+  <h2 id="qunit-banner"></h2>
+  <div id="qunit-testrunner-toolbar"></div>
+  <h2 id="qunit-userAgent"></h2>
+  <ol id="qunit-tests"><li><!-- get valid xhtml strict--></li></ol>
+  <!-- Uncomment this to check the validity. This significantly slows down the test.
+  <p>
+      <a href="http://validator.w3.org/check/referer"><img
+          src="http://www.w3.org/Icons/valid-xhtml10"
+          alt="Valid XHTML 1.0!" height="31" width="88" /></a>
+  </p>
+  -->
+</body>
+</html>
diff --git a/lib/js/test/test-int64.js b/lib/js/test/test-int64.js
new file mode 100644
index 0000000..4df87e1
--- /dev/null
+++ b/lib/js/test/test-int64.js
@@ -0,0 +1,91 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+ /* jshint -W100 */
+
+// Work around for old API used by QUnitAdapter of jsTestDriver
+if (typeof QUnit.log == 'function') {
+  // When using real QUnit (fron PhantomJS) log failures to console
+  QUnit.log(function(details) {
+    if (!details.result) {
+      console.log('======== FAIL ========');
+      console.log('TestName: ' + details.name);
+      if (details.message) console.log(details.message);
+      console.log('Expected: ' + details.expected);
+      console.log('Actual  : ' + details.actual);
+      console.log('======================');
+    }
+  });
+}
+
+QUnit.module('Int64');
+
+  QUnit.test('Int64', function(assert) {
+    console.log('Int64 test -- starts');
+    const EXPECTED_SMALL_INT64_AS_NUMBER = 42;
+    const EXPECTED_SMALL_INT64 = new Int64(42);
+    const EXPECTED_MAX_JS_SAFE_INT64 = new Int64(Number.MAX_SAFE_INTEGER);
+    const EXPECTED_MIN_JS_SAFE_INT64 = new Int64(Number.MIN_SAFE_INTEGER);
+    const EXPECTED_MAX_JS_SAFE_PLUS_ONE_INT64 = new Int64("0020000000000000"); // hex-encoded
+    const EXPECTED_MIN_JS_SAFE_MINUS_ONE_INT64 = new Int64("ffe0000000000000"); // hex-encoded 2's complement
+    const EXPECTED_MAX_SIGNED_INT64 = new Int64("7fffffffffffffff"); // hex-encoded
+    const EXPECTED_MIN_SIGNED_INT64 = new Int64("8000000000000000"); // hex-encoded 2's complement
+    const EXPECTED_INT64_LIST = [
+      EXPECTED_SMALL_INT64,
+      EXPECTED_MAX_JS_SAFE_INT64,
+      EXPECTED_MIN_JS_SAFE_INT64,
+      EXPECTED_MAX_JS_SAFE_PLUS_ONE_INT64,
+      EXPECTED_MIN_JS_SAFE_MINUS_ONE_INT64,
+      EXPECTED_MAX_SIGNED_INT64,
+      EXPECTED_MIN_SIGNED_INT64
+    ];
+
+    assert.ok(EXPECTED_SMALL_INT64.equals(Int64Test.SMALL_INT64));
+    assert.ok(EXPECTED_MAX_JS_SAFE_INT64.equals(Int64Test.MAX_JS_SAFE_INT64));
+    assert.ok(EXPECTED_MIN_JS_SAFE_INT64.equals(Int64Test.MIN_JS_SAFE_INT64));
+    assert.ok(
+      EXPECTED_MAX_JS_SAFE_PLUS_ONE_INT64.equals(
+        Int64Test.MAX_JS_SAFE_PLUS_ONE_INT64
+      )
+    );
+    assert.ok(
+      EXPECTED_MIN_JS_SAFE_MINUS_ONE_INT64.equals(
+        Int64Test.MIN_JS_SAFE_MINUS_ONE_INT64
+      )
+    );
+    assert.ok(EXPECTED_MAX_SIGNED_INT64.equals(Int64Test.MAX_SIGNED_INT64));
+    assert.ok(EXPECTED_MIN_SIGNED_INT64.equals(Int64Test.MIN_SIGNED_INT64));
+    assert.equal(
+      EXPECTED_SMALL_INT64_AS_NUMBER,
+      Int64Test.SMALL_INT64.toNumber()
+    );
+    assert.equal(
+      Number.MAX_SAFE_INTEGER,
+      Int64Test.MAX_JS_SAFE_INT64.toNumber()
+    );
+    assert.equal(
+      Number.MIN_SAFE_INTEGER,
+      Int64Test.MIN_JS_SAFE_INT64.toNumber()
+    );
+
+    for (let i = 0; i < EXPECTED_INT64_LIST.length; ++i) {
+      assert.ok(EXPECTED_INT64_LIST[i].equals(Int64Test.INT64_LIST[i]));
+    }
+    console.log('Int64 test -- ends');
+  });
+
diff --git a/lib/js/test/test-nojq.html b/lib/js/test/test-nojq.html
index 408424e..37b3eb8 100644
--- a/lib/js/test/test-nojq.html
+++ b/lib/js/test/test-nojq.html
@@ -22,6 +22,9 @@
   <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
   <title>Thrift Javascript Bindings: Unit Test</title>
 
+  <script src="build/js/lib/Int64.js" type="text/javascript" charset="utf-8"></script>
+  <script src="build/js/lib/Int64Util.js" type="text/javascript" charset="utf-8"></script>
+  <script src="build/js/lib/JSONInt64.js" type="text/javascript" charset="utf-8"></script>
   <script src="build/js/thrift.js"         type="text/javascript" charset="utf-8"></script>
   <script src="gen-js/ThriftTest_types.js" type="text/javascript" charset="utf-8"></script>
   <script src="gen-js/ThriftTest.js"       type="text/javascript" charset="utf-8"></script>
diff --git a/lib/js/test/test.html b/lib/js/test/test.html
index 8b67014..85c8395 100755
--- a/lib/js/test/test.html
+++ b/lib/js/test/test.html
@@ -22,6 +22,9 @@
   <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
   <title>Thrift Javascript Bindings: Unit Test</title>
 
+  <script src="build/js/lib/Int64.js" type="text/javascript" charset="utf-8"></script>
+  <script src="build/js/lib/Int64Util.js" type="text/javascript" charset="utf-8"></script>
+  <script src="build/js/lib/JSONInt64.js" type="text/javascript" charset="utf-8"></script>
   <script src="build/js/thrift.js"         type="text/javascript" charset="utf-8"></script>
   <script src="gen-js-jquery/ThriftTest_types.js" type="text/javascript" charset="utf-8"></script>
   <script src="gen-js-jquery/ThriftTest.js"       type="text/javascript" charset="utf-8"></script>
diff --git a/lib/js/test/test.js b/lib/js/test/test.js
index a86a509..35ed6ff 100755
--- a/lib/js/test/test.js
+++ b/lib/js/test/test.js
@@ -51,6 +51,9 @@
 const protocol = new Thrift.Protocol(transport);
 const client = new ThriftTest.ThriftTestClient(protocol);
 
+const int64_2_pow_60 = new Int64('1000000000000000');
+const int64_minus_2_pow_60 = new Int64('f000000000000000');
+
 // Work around for old API used by QUnitAdapter of jsTestDriver
 if (typeof QUnit.log == 'function') {
   // When using real QUnit (fron PhantomJS) log failures to console
@@ -132,9 +135,12 @@
   });
   QUnit.test('I64', function(assert) {
     assert.equal(client.testI64(0), 0);
-    //This is usually 2^60 but JS cannot represent anything over 2^52 accurately
-    assert.equal(client.testI64(Math.pow(2, 52)), Math.pow(2, 52));
-    assert.equal(client.testI64(-Math.pow(2, 52)), -Math.pow(2, 52));
+
+    let int64_2_pow_60_result = client.testI64(int64_2_pow_60);
+    assert.ok(int64_2_pow_60.equals(int64_2_pow_60_result));
+
+    let int64_minus_2_pow_60_result = client.testI64(int64_minus_2_pow_60);
+    assert.ok(int64_minus_2_pow_60.equals(int64_minus_2_pow_60_result));
   });
 
 
@@ -145,15 +151,14 @@
     structTestInput.string_thing = 'worked';
     structTestInput.byte_thing = 0x01;
     structTestInput.i32_thing = Math.pow(2, 30);
-    //This is usually 2^60 but JS cannot represent anything over 2^52 accurately
-    structTestInput.i64_thing = Math.pow(2, 52);
+    structTestInput.i64_thing = int64_2_pow_60;
 
     const structTestOutput = client.testStruct(structTestInput);
 
     assert.equal(structTestOutput.string_thing, structTestInput.string_thing);
     assert.equal(structTestOutput.byte_thing, structTestInput.byte_thing);
     assert.equal(structTestOutput.i32_thing, structTestInput.i32_thing);
-    assert.equal(structTestOutput.i64_thing, structTestInput.i64_thing);
+    assert.ok(structTestOutput.i64_thing.equals(structTestInput.i64_thing));
 
     assert.equal(JSON.stringify(structTestOutput), JSON.stringify(structTestInput));
   });
@@ -163,8 +168,7 @@
     xtrTestInput.string_thing = 'worked';
     xtrTestInput.byte_thing = 0x01;
     xtrTestInput.i32_thing = Math.pow(2, 30);
-    //This is usually 2^60 but JS cannot represent anything over 2^52 accurately
-    xtrTestInput.i64_thing = Math.pow(2, 52);
+    xtrTestInput.i64_thing = int64_2_pow_60;
 
     const nestTestInput = new ThriftTest.Xtruct2();
     nestTestInput.byte_thing = 0x02;
@@ -177,7 +181,7 @@
     assert.equal(nestTestOutput.struct_thing.string_thing, nestTestInput.struct_thing.string_thing);
     assert.equal(nestTestOutput.struct_thing.byte_thing, nestTestInput.struct_thing.byte_thing);
     assert.equal(nestTestOutput.struct_thing.i32_thing, nestTestInput.struct_thing.i32_thing);
-    assert.equal(nestTestOutput.struct_thing.i64_thing, nestTestInput.struct_thing.i64_thing);
+    assert.ok(nestTestOutput.struct_thing.i64_thing.equals(nestTestInput.struct_thing.i64_thing));
     assert.equal(nestTestOutput.i32_thing, nestTestInput.i32_thing);
 
     assert.equal(JSON.stringify(nestTestOutput), JSON.stringify(nestTestInput));
@@ -252,7 +256,7 @@
     structTestInput.string_thing = 'worked';
     structTestInput.byte_thing = 0x01;
     structTestInput.i32_thing = Math.pow(2, 30);
-    structTestInput.i64_thing = Math.pow(2, 52);
+    structTestInput.i64_thing = int64_2_pow_60;
 
     const structTestOutput = modifiedClient.testStruct(structTestInput);
 
@@ -260,7 +264,7 @@
     assert.equal(structTestOutput.string_thing, structTestInput.string_thing);
     assert.equal(structTestOutput.changed, null);
     assert.equal(structTestOutput.i32_thing, structTestInput.i32_thing);
-    assert.equal(structTestOutput.i64_thing, structTestInput.i64_thing);
+    assert.ok(structTestOutput.i64_thing.equals(structTestInput.i64_thing));
   });
 
 
@@ -332,13 +336,13 @@
       'string_thing': 'Goodbye4',
       'byte_thing': 4,
       'i32_thing': 4,
-      'i64_thing': 4
+      'i64_thing': new Int64(4)
     },
     {
       'string_thing': 'Hello2',
       'byte_thing': 2,
       'i32_thing': 2,
-      'i64_thing': 2
+      'i64_thing': new Int64(2)
     }]
   };
   QUnit.test('testInsanity', function(assert) {
@@ -401,15 +405,13 @@
     assert.expect(2);
 
     const done = assert.async(2);
-    //This is usually 2^60 but JS cannot represent anything over 2^52 accurately
-    client.testI64(Math.pow(2, 52), function(result) {
-      assert.equal(result, Math.pow(2, 52));
+    client.testI64(int64_2_pow_60, function(result) {
+      assert.ok(int64_2_pow_60.equals(result));
       done();
     });
 
-    //This is usually 2^60 but JS cannot represent anything over 2^52 accurately
-    client.testI64(Math.pow(-2, 52), function(result) {
-      assert.equal(result, Math.pow(-2, 52));
+    client.testI64(int64_minus_2_pow_60, function(result) {
+      assert.ok(int64_minus_2_pow_60.equals(result));
       done();
     });
   });
diff --git a/lib/js/test/test_handler.js b/lib/js/test/test_handler.js
index af5f7bd..8ba296b 100644
--- a/lib/js/test/test_handler.js
+++ b/lib/js/test/test_handler.js
@@ -24,6 +24,7 @@
 const genFolder = es6Mode ? 'gen-nodejs-es6' : 'gen-nodejs';
 const ttypes = require(`./${genFolder}/ThriftTest_types`);
 const TException = require('../../nodejs/lib/thrift').TException;
+const Int64 = require('node-int64');
 
 exports.ThriftTestHandler = {
   testVoid: function(result) {
@@ -122,13 +123,13 @@
     hello.string_thing = 'Hello2';
     hello.byte_thing = 2;
     hello.i32_thing = 2;
-    hello.i64_thing = 2;
+    hello.i64_thing = new Int64(2);
 
     const goodbye = new ttypes.Xtruct();
     goodbye.string_thing = 'Goodbye4';
     goodbye.byte_thing = 4;
     goodbye.i32_thing = 4;
-    goodbye.i64_thing = 4;
+    goodbye.i64_thing = new Int64(4);
 
     const crazy = new ttypes.Insanity();
     crazy.userMap = [];
diff --git a/lib/js/test/testws.html b/lib/js/test/testws.html
index 184500f..5ff9f22 100644
--- a/lib/js/test/testws.html
+++ b/lib/js/test/testws.html
@@ -22,6 +22,9 @@
   <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
   <title>Thrift Javascript Bindings: Unit Test</title>
 
+  <script src="build/js/lib/Int64.js" type="text/javascript" charset="utf-8"></script>
+  <script src="build/js/lib/Int64Util.js" type="text/javascript" charset="utf-8"></script>
+  <script src="build/js/lib/JSONInt64.js" type="text/javascript" charset="utf-8"></script>
   <script src="build/js/thrift.js"         type="text/javascript" charset="utf-8"></script>
   <script src="gen-js/ThriftTest_types.js" type="text/javascript" charset="utf-8"></script>
   <script src="gen-js/ThriftTest.js"       type="text/javascript" charset="utf-8"></script>