diff --git a/circular-json/circular-json-tests.ts b/circular-json/circular-json-tests.ts
new file mode 100644
index 0000000000..d3f2e0951c
--- /dev/null
+++ b/circular-json/circular-json-tests.ts
@@ -0,0 +1,31 @@
+/// <reference path="circular-json.d.ts" />
+
+import CircularJSON = require('circular-json');
+
+var replacer = (key: any, val: any) => {
+  return val;
+}
+
+var replacerArray = ['a', 'x'];
+
+// implements JSON interface
+var json_obj: JSON = CircularJSON;
+
+CircularJSON.parse('{"a":"b"}');
+
+CircularJSON.parse('{"a":"b"}', replacer);
+
+// just stringify a value
+CircularJSON.stringify({a: 'b'});
+
+// do replacements for part of the object
+CircularJSON.stringify({a: 'b'}, replacer);
+CircularJSON.stringify({a: 'b'}, replacerArray);
+
+// add whitespace to the output
+CircularJSON.stringify({a: 'b'}, replacer, 5);
+CircularJSON.stringify({a: 'b'}, replacerArray, 5);
+
+// do not actually set up a re-parseable object
+CircularJSON.stringify({a: 'b'}, replacer, 5, true);
+CircularJSON.stringify({a: 'b'}, replacerArray, 5, true);
diff --git a/circular-json/circular-json.d.ts b/circular-json/circular-json.d.ts
new file mode 100644
index 0000000000..2aa27e947a
--- /dev/null
+++ b/circular-json/circular-json.d.ts
@@ -0,0 +1,15 @@
+// Type definitions for circular-json v0.1.6
+// Project: https://github.com/WebReflection/circular-json
+// Definitions by: Jonathan Pevarnek <https://github.com/jpevarnek/>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module 'circular-json' {
+  interface ICircularJSON extends JSON {
+    parse(text: string, reviver?: (key: any, value: any) => any): any;
+    stringify(value: any, replacer?: ((key: string, value: any) => any) | any[], space?: any, placeholder?: boolean): string;
+  }
+
+  var CircularJSON: ICircularJSON;
+
+  export = CircularJSON;
+}