diff --git a/tests/index.html b/tests/index.html
index efbe63a2..43347dba 100644
--- a/tests/index.html
+++ b/tests/index.html
@@ -27,7 +27,7 @@
 	<script src="spec/s-number.js"></script>
 	<script src="spec/s-object.js"></script>
 	<script src="spec/s-string.js"></script>
-
+	<script src="spec/s-json.js"></script>
 
 	<script type="text/javascript">
 		(function() {
diff --git a/tests/native.html b/tests/native.html
index 241b61b7..b0c31c1d 100644
--- a/tests/native.html
+++ b/tests/native.html
@@ -23,7 +23,7 @@
 	<script src="spec/s-number.js"></script>
 	<script src="spec/s-object.js"></script>
 	<script src="spec/s-string.js"></script>
-
+	<script src="spec/s-json.js"></script>
 
 	<script type="text/javascript">
 		(function() {
diff --git a/tests/spec/s-json.js b/tests/spec/s-json.js
new file mode 100644
index 00000000..82447c69
--- /dev/null
+++ b/tests/spec/s-json.js
@@ -0,0 +1,168 @@
+/* global describe, it, expect */
+
+describe('JSON.parse', function () {
+    it('should throw correct Error types', function () {
+        try {
+            expect(function () {
+                JSON.parse();
+            }).toThrow();
+        } catch (e) {
+            expect(e instanceof SyntaxError).toBe(true);
+        }
+        try {
+            expect(function () {
+                JSON.parse(undefined);
+            }).toThrow();
+        } catch (e) {
+            expect(e instanceof SyntaxError).toBe(true);
+        }
+        try {
+            expect(function () {
+                JSON.parse('');
+            }).toThrow();
+        } catch (e) {
+            expect(e instanceof SyntaxError).toBe(true);
+        }
+        try {
+            expect(function () {
+                JSON.parse('{"A": undefined}');
+            }).toThrow();
+        } catch (e) {
+            expect(e instanceof SyntaxError).toBe(true);
+        }
+    });
+    it('work with basic primatives', function () {
+        expect(JSON.parse(null)).toBe(null);
+        expect(JSON.parse('-1')).toBe(-1);
+        expect(JSON.parse('0')).toBe(0);
+        expect(JSON.parse('1')).toBe(1);
+        expect(JSON.parse(false)).toBe(false);
+        expect(JSON.parse(true)).toBe(true);
+        expect(JSON.parse('null')).toBe(null);
+    });
+    it('work with complex object', function () {
+        var expected = { A: [1, true, false, null, '\u0000\b\n\f\r\t'] };
+        var actual = JSON.parse('{"A":[1,true,false,null,"\\u0000\\b\\n\\f\\r\\t"]}');
+        expect(actual).toEqual(expected);
+    });
+});
+
+describe('JSON.stringify', function () {
+    it('cyclic should throw a TypeError', function () {
+        var a = [];
+        a[0] = a;
+        try {
+            expect(function () {
+                JSON.stringify(a);
+            }).to.throwException(function (e) {
+                expect(e).toBe.a(TypeError);
+            });
+        } catch (e) {
+           expect(e instanceof TypeError).toBe(true);
+        }
+    });
+    it('basic', function () {
+        expect(JSON.stringify(null)).toBe('null');
+        expect(JSON.stringify(-1)).toBe('-1');
+        expect(JSON.stringify(0)).toBe('0');
+        expect(JSON.stringify(1)).toBe('1');
+        expect(JSON.stringify(Number(1))).toBe('1');
+        expect(JSON.stringify(false)).toBe('false');
+        expect(JSON.stringify(true)).toBe('true');
+        expect(JSON.stringify(Boolean(true))).toBe('true');
+        expect(JSON.stringify()).toBe(undefined);
+        expect(JSON.stringify(undefined)).toBe(undefined);
+        expect(JSON.stringify('')).toBe('""');
+        expect(JSON.stringify('abc')).toBe('"abc"');
+        expect(JSON.stringify(String('abc'))).toBe('"abc"');
+    });
+    it('known issues', function () {
+        var noop = function () {};
+        var customJSON = function () {
+            return 1;
+        };
+        customJSON.toJSON = customJSON;
+        // Firefox 3.1b1 and b2 serialize string, number, and boolean
+        // primitives as object literals.
+        expect(JSON.stringify(0)).toBe('0');
+        // FF 3.1b1, b2, and JSON 2 serialize wrapped primitives as object
+        // literals.
+        expect(JSON.stringify(Object(0))).toBe('0');
+        expect(JSON.stringify(Object(''))).toBe('""');
+        // FF 3.1b1, 2 throw an error if the toJSON is `null`, `undefined`, or
+        // does not define a canonical JSON representation (this applies to
+        // objects with `toJSON` properties as well, *unless* they are nested
+        // within an object or array).
+        expect(function () {
+            JSON.stringify(noop);
+        }).not.toThrow();
+        expect(typeof JSON.stringify(noop)).toBe('undefined');
+        // IE 8 serializes `undefined` as `"undefined"`. Safari 5.1.7 and FF
+        // 3.1b3 pass this test.
+        expect(typeof JSON.stringify(undefined)).toBe('undefined');
+        // Safari <= 5.1.7 and FF 3.1b3 throw `Error`s and `TypeError`s,
+        // respectively, if the toSON is omitted entirely.
+        expect(function () {
+            JSON.stringify();
+        }).not.toThrow();
+        expect(typeof JSON.stringify()).toBe('undefined');
+        // FF 3.1b1, 2 throw an error if the given testTemp.a is not a number,
+        // string, array, object, Boolean, or `null` literal. This applies to
+        // objects with custom `toJSON` methods as well, unless they are nested
+        // inside object or array literals. YUI 3.0.0b1 ignores custom `toJSON`
+        // methods entirely.
+        expect(function () {
+            JSON.stringify(customJSON);
+            JSON.stringify([customJSON]);
+        }).not.toThrow();
+        expect(JSON.stringify(customJSON)).toBe('1');
+        expect(JSON.stringify([customJSON])).toBe('[1]');
+        // Prototype <= 1.6.1 serializes `[undefined]` as `"[]"` instead of
+        // `"[null]"`.
+        expect(JSON.stringify([undefined])).toBe('[null]');
+        // YUI 3.0.0b1 fails to serialize `null` literals.
+        expect(JSON.stringify(null)).toBe('null');
+        // FF 3.1b1, 2 halts serialization if an array contains a function:
+        // `[1, true, noop, 1]` serializes as "[1,true,],". These versions
+        // of Firefox also allow trailing commas in JSON objects and arrays.
+        // FF 3.1b3 elides non-JSON values from objects and arrays, unless they
+        // define custom `toJSON` methods.
+        expect(JSON.stringify([undefined, noop, null])).toBe('[null,null,null]');
+        // Simple serialization test. FF 3.1b1 uses Unicode escape sequences
+        // where character escape codes are expected (e.g., `\b` => `\u0008`).
+        // Removed test for '\0' => '\\'u0000'as Chrome 10 fails in 'use strict' mode with
+        // Error: Uncaught SyntaxError: Octal literals are not allowed in strict mode.
+        expect(function () {
+            JSON.stringify({
+                A: [customJSON, true, false, null, '\b\n\f\r\t']
+            });
+        }).not.toThrow();
+        expect(JSON.stringify({
+            A: [customJSON, true, false, null, '\b\n\f\r\t']
+        })).toBe('{"A":[1,true,false,null,"\\b\\n\\f\\r\\t"]}');
+        // FF 3.1b1 and b2 ignore the `filter` and `width` arguments.
+        //JSON.stringify(null, testTemp.customJSON) === '"1"' &&
+        expect(JSON.stringify([1, 2], null, 1)).toBe('[\n 1,\n 2\n]');
+    });
+    it('extra', function () {
+        expect(JSON.stringify({
+            A: undefined,
+            B: null
+        })).toBe('{"B":null}');
+        expect(JSON.stringify({
+            A: [1, true, false, null, '\u0000\b\n\f\r\t']
+        })).toBe('{"A":[1,true,false,null,"\\u0000\\b\\n\\f\\r\\t"]}');
+    });
+    it('date toJSON', function () {
+        var date1 = new Date(-8.64e15);
+        var date2 = new Date(8.64e15);
+        var date3 = new Date(-621987552e5);
+        var date4 = new Date(-1);
+        expect(JSON.stringify(date1)).toBe('"-271821-04-20T00:00:00.000Z"');
+        expect(JSON.stringify(date2)).toBe('"+275760-09-13T00:00:00.000Z"');
+        expect(JSON.stringify(date3)).toBe('"-000001-01-01T00:00:00.000Z"');
+        expect(JSON.stringify(date4)).toBe('"1969-12-31T23:59:59.999Z"');
+        date1.toJSON = undefined;
+        expect(JSON.stringify(date1)).toBe('{}');
+    });
+});