Serverless HTTP

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

serverless-http

2.0

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

All frameworks have been updated to their latest versions.

Description

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.

Support

Supported Frameworks

(* Experimental)

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

Supported Providers

AWS
Azure (Experimental, untested, probably outdated)

Examples

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

Limitations

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.

Contributing

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