Serverless HTTP

Use your existing middleware framework (e.g. Express, Koa) in AWS Lambda

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Build Status


The 2.0 release moves to async/await and requires Node 8+.

All frameworks have been updated to their latest versions.


This module allows you to 'wrap' your API for serverless use. No HTTP server, no ports or sockets. Just your code in the same execution pipeline you are already familiar with.


Supported Frameworks

(* Experimental)

  • Connect
  • Express
  • Koa
  • Restana
  • Sails *
  • Hapi *
  • Fastify *
  • Restify *
  • Polka *
  • Loopback *

Supported Providers

  • AWS
  • Azure (Experimental, untested, probably outdated)


Please check the examples folder!

Usage example using the Koa framework

const serverless = require('serverless-http');
const Koa = require('koa'); // or any supported framework

const app = new Koa();

app.use(/* register your middleware as normal */);

// this is it!
module.exports.handler = serverless(app);

// or as a promise
const handler = serverless(app);
module.exports.handler = async (event, context) => {
  // you can do other things here
  const result = await handler(event, context);
  // and here
  return result;

Usage example using the Express framework with Azure

const serverless = require('serverless-http');
const express = require('express');

const app = express();

app.use(/* register your middleware as normal */);

const handler = serverless(app, { provider: 'azure' });
module.exports.funcName = async (context, req) => {
  context.res = await handler(context, req);

Other examples

json-server-less-λ - using serverless-http with json-server and serverless framework in AWS


Your code is running in a serverless environment. You cannot rely on your server being 'up' in the sense that you can/should not use in-memory sessions, web sockets, etc. You are also subject to provider specific restrictions on request/response size, duration, etc.

Think of this as a familiar way of expressing your app logic, not trying to make serverless do something it cannot.


Pull requests are welcome! Especially test scenarios for different situations and configurations.

Further Reading

Here are some more detailed examples and advanced configuration options as well as provider-specific documentation