diff --git a/compiler/cpp/src/thrift/generate/t_js_generator.cc b/compiler/cpp/src/thrift/generate/t_js_generator.cc
index f8f1beed89a..d30ce41537c 100644
--- a/compiler/cpp/src/thrift/generate/t_js_generator.cc
+++ b/compiler/cpp/src/thrift/generate/t_js_generator.cc
@@ -698,8 +698,12 @@ string t_js_generator::render_const_value(t_type* type, t_const_value* value) {
     for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {
       if (v_iter != val.begin())
         out << "," << endl;
-
-      out << indent() << render_const_value(ktype, v_iter->first);
+      
+      if (ktype->is_base_type() && ((t_base_type*)get_true_type(ktype))->get_base() == t_base_type::TYPE_I64){
+        out << indent() << "\"" << v_iter->first->get_integer() << "\"";
+      } else {
+        out << indent() << render_const_value(ktype, v_iter->first);
+      }
 
       out << " : ";
       out << render_const_value(vtype, v_iter->second);
diff --git a/lib/js/package.json b/lib/js/package.json
index c4bcc6d6c3b..a35ac15a323 100644
--- a/lib/js/package.json
+++ b/lib/js/package.json
@@ -16,7 +16,7 @@
   },
   "dependencies": {
     "jsdoc": "^3.5.5",
-    "json-int64": "^0.0.3",
+    "json-int64": "^1.0.0",
     "nopt": "^4.0.1"
   }
 }
diff --git a/lib/js/test/test-int64.html b/lib/js/test/test-int64.html
index 620e6ff861d..bcb05fb371e 100644
--- a/lib/js/test/test-int64.html
+++ b/lib/js/test/test-int64.html
@@ -25,6 +25,7 @@
       <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>
+      <script src="build/js/lib/JSONInt64.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>
 
diff --git a/lib/js/test/test-int64.js b/lib/js/test/test-int64.js
index 4df87e1d398..cf7e8282b79 100644
--- a/lib/js/test/test-int64.js
+++ b/lib/js/test/test-int64.js
@@ -86,6 +86,12 @@ QUnit.module('Int64');
     for (let i = 0; i < EXPECTED_INT64_LIST.length; ++i) {
       assert.ok(EXPECTED_INT64_LIST[i].equals(Int64Test.INT64_LIST[i]));
     }
+
+    for (let i = 0; i < EXPECTED_INT64_LIST.length; ++i){
+      let int64Object = EXPECTED_INT64_LIST[i];
+      assert.ok(Int64Test.INT64_2_INT64_MAP[JSONInt64.toDecimalString(int64Object)].equals(int64Object));
+    }
+
     console.log('Int64 test -- ends');
   });
 
diff --git a/lib/nodejs/test/int64.test.js b/lib/nodejs/test/int64.test.js
index 106e446b11e..27ad28c003f 100644
--- a/lib/nodejs/test/int64.test.js
+++ b/lib/nodejs/test/int64.test.js
@@ -18,6 +18,7 @@
  */
 
 const Int64 = require("node-int64");
+const JSONInt64 = require("json-int64");
 const i64types = require("./gen-nodejs-es6/Int64Test_types.js");
 const test = require("tape");
 
@@ -72,6 +73,16 @@ const cases = {
     for (let i = 0; i < EXPECTED_INT64_LIST.length; ++i) {
       assert.ok(EXPECTED_INT64_LIST[i].equals(i64types.INT64_LIST[i]));
     }
+
+    for (let i = 0; i < EXPECTED_INT64_LIST.length; ++i) {
+      const int64Object = EXPECTED_INT64_LIST[i];
+      assert.ok(
+        i64types.INT64_2_INT64_MAP[
+          JSONInt64.toDecimalString(int64Object)
+        ].equals(int64Object)
+      );
+    }
+
     assert.end();
   }
 };
diff --git a/lib/nodets/test/int64.test.ts b/lib/nodets/test/int64.test.ts
index 3ff0d85b470..d209234b50c 100644
--- a/lib/nodets/test/int64.test.ts
+++ b/lib/nodets/test/int64.test.ts
@@ -18,6 +18,7 @@
  */
 
 import Int64 = require("node-int64");
+import JSONInt64 = require('json-int64');
 import i64types = require("./gen-nodejs/Int64Test_types");
 import test = require("tape");
 
@@ -72,6 +73,12 @@ const cases = {
     for (let i = 0; i < EXPECTED_INT64_LIST.length; ++i) {
       assert.ok(EXPECTED_INT64_LIST[i].equals(i64types.INT64_LIST[i]));
     }
+
+    for (let i = 0; i < EXPECTED_INT64_LIST.length; ++i){
+      let int64Object = EXPECTED_INT64_LIST[i];
+      assert.ok(i64types.INT64_2_INT64_MAP[JSONInt64.toDecimalString(int64Object)].equals(int64Object));
+    }
+
     assert.end();
   }
 };
diff --git a/lib/ts/package.json b/lib/ts/package.json
index 47eec6277a8..1a1ccdc85a8 100644
--- a/lib/ts/package.json
+++ b/lib/ts/package.json
@@ -23,7 +23,7 @@
   "dependencies": {
     "bufferutil": "^4.0.1",
     "jsdoc": "^3.5.5",
-    "json-int64": "^0.0.3",
+    "json-int64": "^1.0.0",
     "nopt": "^4.0.1"
   },
   "types": "./thrift.d.ts"
diff --git a/lib/ts/test/test-int64.ts b/lib/ts/test/test-int64.ts
index 3ea7919e2c8..254d8d7bfcc 100644
--- a/lib/ts/test/test-int64.ts
+++ b/lib/ts/test/test-int64.ts
@@ -19,6 +19,7 @@
  /* jshint -W100 */
 
 var Int64 = require("node-int64");
+var JSONInt64 = require("json-int64");
 import { Int64Test } from "./gen-js/Int64Test_types";
 
 
@@ -89,6 +90,12 @@ QUnit.module('Int64');
     for (let i = 0; i < EXPECTED_INT64_LIST.length; ++i) {
       assert.ok(EXPECTED_INT64_LIST[i].equals(Int64Test.INT64_LIST[i]));
     }
+
+    for (let i = 0; i < EXPECTED_INT64_LIST.length; ++i){
+      let int64Object = EXPECTED_INT64_LIST[i];
+      assert.ok(Int64Test.INT64_2_INT64_MAP[JSONInt64.toDecimalString(int64Object)].equals(int64Object));
+    }
+
     console.log('Int64 test -- ends');
   });
 
diff --git a/package-lock.json b/package-lock.json
index 1e089d94eb3..7c39c2a2b59 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1223,6 +1223,15 @@
         "underscore": "~1.8.3"
       }
     },
+    "json-int64": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/json-int64/-/json-int64-1.0.0.tgz",
+      "integrity": "sha512-yrTg9swToElhEPETLMdZkEzDhbXLs+cxkw/b2rglMPOBlM1DE0utH1EReSMLcnpYJk5iUvD12r0fP2/xHitF5Q==",
+      "dev": true,
+      "requires": {
+        "node-int64": "0.4.0"
+      }
+    },
     "json-schema-traverse": {
       "version": "0.4.1",
       "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
diff --git a/package.json b/package.json
index 97b7abf9a1d..b850a71b298 100644
--- a/package.json
+++ b/package.json
@@ -49,6 +49,7 @@
     "eslint-plugin-prettier": "^3.0.0",
     "istanbul": "^0.4.5",
     "jsdoc": "^3.5.5",
+    "json-int64": "^1.0.0",
     "prettier": "^1.14.3",
     "tape": "^4.9.0",
     "utf-8-validate": "^4.0.0",
diff --git a/test/Int64Test.thrift b/test/Int64Test.thrift
index 7a9ed2ffc64..348cc9c4753 100644
--- a/test/Int64Test.thrift
+++ b/test/Int64Test.thrift
@@ -32,3 +32,13 @@ const i64 MAX_SIGNED_INT64 = 9223372036854775807
 const i64 MIN_SIGNED_INT64 = -9223372036854775808
 
 const list<i64> INT64_LIST = [SMALL_INT64, MAX_JS_SAFE_INT64, MIN_JS_SAFE_INT64, MAX_JS_SAFE_PLUS_ONE_INT64, MIN_JS_SAFE_MINUS_ONE_INT64, MAX_SIGNED_INT64, MIN_SIGNED_INT64]
+
+const map<i64, i64> INT64_2_INT64_MAP = {
+    SMALL_INT64: SMALL_INT64,
+    MAX_JS_SAFE_INT64: MAX_JS_SAFE_INT64,
+    MIN_JS_SAFE_INT64: MIN_JS_SAFE_INT64,
+    MAX_JS_SAFE_PLUS_ONE_INT64: MAX_JS_SAFE_PLUS_ONE_INT64,
+    MIN_JS_SAFE_MINUS_ONE_INT64: MIN_JS_SAFE_MINUS_ONE_INT64,
+    MAX_SIGNED_INT64: MAX_SIGNED_INT64,
+    MIN_SIGNED_INT64: MIN_SIGNED_INT64
+    }