diff --git a/express-session/express-session-tests.ts b/express-session/express-session-tests.ts
new file mode 100644
index 000000000..1e1f909b1
--- /dev/null
+++ b/express-session/express-session-tests.ts
@@ -0,0 +1,41 @@
+/// <reference path="./express-session.d.ts" />
+
+import express = require('express');
+import session = require('express-session');
+
+var app = express();
+
+app.use(session({
+  secret: 'keyboard cat'
+}));
+app.use(session({
+  secret: 'keyboard cat',
+  name: 'connect.sid',
+  store: new session.MemoryStore(),
+  cookie: { path: '/', httpOnly: true, secure: false, maxAge: null },
+  genid: (req: express.Request): string => { return ''; },
+  rolling: false,
+  resave: true,
+  proxy: true,
+  saveUninitialized: true,
+  unset: 'keep'
+}));
+
+
+interface MySession extends Express.Session {
+  views: number;
+}
+app.use(function(req, res, next) {
+  var sess = <MySession>req.session;
+  if (sess.views) {
+    sess.views++
+    res.setHeader('Content-Type', 'text/html')
+    res.write('<p>views: ' + sess.views + '</p>')
+    res.write('<p>expires in: ' + (sess.cookie.maxAge / 1000) + 's</p>')
+    res.end()
+  } else {
+    sess.views = 1
+    res.end('welcome to the session demo. refresh!')
+  }
+});
+
diff --git a/express-session/express-session.d.ts b/express-session/express-session.d.ts
new file mode 100644
index 000000000..672e3a1c2
--- /dev/null
+++ b/express-session/express-session.d.ts
@@ -0,0 +1,71 @@
+// Type definitions for express-session
+// Project: https://www.npmjs.org/package/express-session
+// Definitions by: Hiroki Horiuchi <https://github.com/horiuchi/>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../express/express.d.ts" />
+
+declare module Express {
+
+  export interface Request {
+    session?: Session;
+  }
+
+  export interface Session {
+    regenerate: (callback: (err: any) => void) => void;
+    destroy: (callback: (err: any) => void) => void;
+    reload: (callback: (err: any) => void) => void;
+    save: (callback: (err: any) => void) => void;
+    touch: (callback: (err: any) => void) => void;
+
+    cookie: SessionCookie;
+  }
+  export interface SessionCookie {
+    originalMaxAge: number;
+    path: string;
+    maxAge: number;
+    secure?: boolean;
+    httpOnly: boolean;
+    domain?: string;
+    expires: Date;
+    serialize: (name: string, value: string) => string;
+  }
+}
+
+declare module "express-session" {
+  import express = require('express');
+
+  function session(options?: {
+    secret: string;
+    name?: string;
+    store?: session.Store;
+    cookie?: express.CookieOptions;
+    genid?: (req: express.Request) => string;
+    rolling?: boolean;
+    resave?: boolean;
+    proxy?: boolean;
+    saveUninitialized?: boolean;
+    unset?: string;
+  }): express.RequestHandler;
+
+  module session {
+    export interface Store {
+      get: (sid: string, callback: (err: any, session: Express.Session) => void) => void;
+      set: (sid: string, session: Express.Session, callback: (err: any) => void) => void;
+      destroy: (sid: string, callback: (err: any) => void) => void;
+      length?: (callback: (err: any, length: number) => void) => void;
+      clear?: (callback: (err: any) => void) => void;
+    }
+    export class MemoryStore implements Store {
+      get: (sid: string, callback: (err: any, session: Express.Session) => void) => void;
+      set: (sid: string, session: Express.Session, callback: (err: any) => void) => void;
+      destroy: (sid: string, callback: (err: any) => void) => void;
+      all: (callback: (err: any, obj: { [sid: string]: Express.Session; }) => void) => void;
+      length: (callback: (err: any, length: number) => void) => void;
+      clear: (callback: (err: any) => void) => void;
+    }
+  }
+
+  export = session;
+}
+