diff --git a/_debugger/_debugger-tests.ts b/_debugger/_debugger-tests.ts
new file mode 100644
index 000000000..e6d7cf998
--- /dev/null
+++ b/_debugger/_debugger-tests.ts
@@ -0,0 +1,10 @@
+/// <reference path="_debugger.d.ts"/>
+import _debugger = require("_debugger");
+var {Client} = _debugger;
+
+var client = new Client();
+
+client.connect(8888, 'localhost');
+client.listbreakpoints((err, res) => {
+
+});
diff --git a/_debugger/_debugger.d.ts b/_debugger/_debugger.d.ts
new file mode 100644
index 000000000..15ed8bfcf
--- /dev/null
+++ b/_debugger/_debugger.d.ts
@@ -0,0 +1,135 @@
+// Type definitions for Node.js debugger API
+// Project: http://nodejs.org/
+// Definitions by: Basarat Ali Syed <https://github.com/basarat>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../node/node.d.ts"/>
+
+declare module NodeJS {
+    export module _debugger {
+        export interface Packet {
+            raw: string;
+            headers: string[];
+            body: Message;
+        }
+
+        export interface Message {
+            seq: number;
+            type: string;
+        }
+
+        export interface RequestInfo {
+            command: string;
+            arguments: any;
+        }
+
+        export interface Request extends Message, RequestInfo {
+        }
+
+        export interface Event extends Message {
+            event: string;
+            body?: any;
+        }
+
+        export interface Response extends Message {
+            request_seq: number;
+            success: boolean;
+            /** Contains error message if success === false. */
+            message?: string;
+            /** Contains message body if success === true. */
+            body?: any;
+        }
+
+        export interface BreakpointMessageBody {
+            type: string;
+            target: number;
+            line: number;
+        }
+
+        export class Protocol {
+            res: Packet;
+            state: string;
+            execute(data: string): void;
+            serialize(rq: Request): string;
+            onResponse: (pkt: Packet) => void;
+        }
+
+        export var NO_FRAME: number;
+        export var port: number;
+
+        export interface ScriptDesc {
+            name: string;
+            id: number;
+            isNative?: boolean;
+            handle?: number;
+            type: string;
+            lineOffset?: number;
+            columnOffset?: number;
+            lineCount?: number;
+        }
+
+        export interface Breakpoint {
+            id: number;
+            scriptId: number;
+            script: ScriptDesc;
+            line: number;
+            condition?: string;
+            scriptReq?: string;
+        }
+
+        export interface RequestHandler {
+            (err: boolean, body: Message, res: Packet): void;
+            request_seq?: number;
+        }
+
+        export interface ResponseBodyHandler {
+            (err: boolean, body?: any): void;
+            request_seq?: number;
+        }
+
+        export interface ExceptionInfo {
+            text: string;
+        }
+
+        export interface BreakResponse {
+            script?: ScriptDesc;
+            exception?: ExceptionInfo;
+            sourceLine: number;
+            sourceLineText: string;
+            sourceColumn: number;
+        }
+
+        export function SourceInfo(body: BreakResponse): string;
+
+        export interface ClientInstance extends EventEmitter {
+            protocol: Protocol;
+            scripts: ScriptDesc[];
+            handles: ScriptDesc[];
+            breakpoints: Breakpoint[];
+            currentSourceLine: number;
+            currentSourceColumn: number;
+            currentSourceLineText: string;
+            currentFrame: number;
+            currentScript: string;
+
+            connect(port: number, host: string): void;
+            req(req: any, cb: RequestHandler): void;
+            reqFrameEval(code: string, frame: number, cb: RequestHandler): void;
+            mirrorObject(obj: any, depth: number, cb: ResponseBodyHandler): void;
+            setBreakpoint(rq: BreakpointMessageBody, cb: RequestHandler): void;
+            clearBreakpoint(rq: Request, cb: RequestHandler): void;
+            listbreakpoints(cb: RequestHandler): void;
+            reqSource(from: number, to: number, cb: RequestHandler): void;
+            reqScripts(cb: any): void;
+            reqContinue(cb: RequestHandler): void;
+        }
+
+        export var Client : {
+            new (): ClientInstance
+        }
+    }
+}
+
+declare module "_debugger"{
+    export = NodeJS._debugger;
+}