4.2.0 • Public • Published


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HTTP server implementation for Node.js based on uWebSockets.js!

Formerly part of the 0http project!


low-http-server is a Node.js wrapper around the great uWebSockets.js library. Here, I/O throughput is maximized at the cost of API compatibility, when we compare it to the standard Node.js HTTP server interface.

As far as Node.js stands, uWebSockets.js brings the best I/O performance in terms of HTTP servers.

const server = require('low-http-server')({})
server.on('request', (req, res) => {
  res.end('Hello World!')

server.listen(3000, () => {
  console.log('Server listening on')

Or with SSL:

const server = require('low-http-server')({
  cert_file_name: './demos/test.crt',
  key_file_name: './demos/test.key',
  passphrase: 'test'

server.on('request', (req, res) => {
  res.end('Hello World!')

server.listen(3000, () => {
  console.log('Server listening on')


Machine: MacBook Pro (13-inch, 2020), 1,4 GHz Quad-Core Intel Core i5
Node.js version: 12.18.3

wrk -t8 -c40 -d5s

Take note that low-http-server does not clusterize on anything besides reasonably recent versions of Linux kernel. You may deploy several instances listening on different IPs and being proxied (e.g. by nginx) as a workaround.

Clusterization could be possibly implemented, as soon as uWebSockets.js gets support for listening to a socket.

Known limitations

  • Limited compatibility with Node.js standard interface.


General notes

Low-http-server has become more compatible with Node.js standard interface, but it is not perfect. Despite certain quirks, low-http-server can often replace the usual node http module backend and serve as an underlying server for popular node.js frameworks. There are only two known requirements:

  • The framework doesn't rely on deprecated Object.setPrototypeOf to add new properties to the request and response objects. This is because our request and response provide similar APIs, but are inherently different in their internals. They cannot be replaced with an essentialy incompatible foreign Prototype. This means that Express is currently incompatible (see Express init middleware).
  • The HTTP handler function is NOT prioritized using setImmediate . Otherwise, low-http-server will work, but perforfmance will suffer tremendously. For example, in Restana you are going to need prioRequestsProcessing framework option set to false

0http framework

const low = require('low-http-server')
const cero = require('0http')

const { router, server } = cero({
  server: low()

router.get('/hi', (req, res) => {
  res.end('Hello World!')

server.listen(3000, (socket) => {
  if (socket) {
    console.log('HTTP server ready!')

restana framework

No problems, if prioRequestsProcessing is set to false.

const server = require('low-http-server')({})

const service = require('restana')({
  server: server,
  prioRequestsProcessing: false // NOTE: required for restana integration

server.listen(3000, () => {
  console.log('Server listening on')

service.get('/', (req,res) => {
  res.send('It works!')


  • Broken in current release.

Other frameworks

Please refer to their documentation on how to use your own server.

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npm i low-http-server

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  • jkyberneees
  • schamberg97