Fast and low overhead web framework, for Node.js
Branch: master
Clone or download
Type Name Latest commit message Commit time
Failed to load latest commit information.
.github Pretty issue templates (#1209) Oct 17, 2018
docs Docs/Add standard json schema examples (#1355) Feb 23, 2019
examples Hooks: always use fastify core objects (#1066) Aug 11, 2018
lib Fix/add schema to validator (#1446) Feb 23, 2019
test Fix/add schema to validator (#1446) Feb 23, 2019
tools trigger website build on commit to master Aug 17, 2017
.editorconfig Fix trailing space and add editorconfig to enforce Apr 12, 2017
.gitattributes Add .gitattributes to normalize line endings (#797) Feb 20, 2018
.gitignore Update ignore files (#1452) Feb 18, 2019
.npmignore Update ignore files (#1452) Feb 18, 2019
.travis.yml Add license-checker on CI (#1357) Jan 2, 2019 Added emails to CoC Dec 6, 2017 Add onboarding section to CONTRIBUTING document (#1469) Feb 22, 2019
LICENSE Update copyright year to 2019 (#1362) Jan 3, 2019
azure-pipelines-npm-template.yml Adding tasks to publish test reports to AzurePipelines (#1274) Jan 10, 2019
azure-pipelines-yarn-template.yml Adding tasks to publish test reports to AzurePipelines (#1274) Jan 10, 2019
azure-pipelines.yml Adding tasks to publish test reports to AzurePipelines (#1274) Jan 10, 2019
fastify.d.ts Add `query` option (#1442) Feb 9, 2019
fastify.js Fix/add schema to validator (#1446) Feb 23, 2019
package.json Add email for cemremengu (#1467) Feb 22, 2019

Build Status Build Status Known Vulnerabilities Coverage Status js-standard-style

NPM version NPM downloads Gitter Security Responsible Disclosure

An efficient server implies a lower cost of the infrastructure, a better responsiveness under load and happy users. How can you efficiently handle the resources of your server, knowing that you are serving the highest number of requests as possible, without sacrificing security validations and handy development?

Enter Fastify. Fastify is a web framework highly focused on providing the best developer experience with the least overhead and a powerful plugin architecture. It is inspired by Hapi and Express and as far as we know, it is one of the fastest web frameworks in town.


Install with npm:

npm i fastify --save

Install with yarn:

yarn add fastify


// Require the framework and instantiate it
const fastify = require('fastify')({
  logger: true

// Declare a route
fastify.get('/', (request, reply) => {
  reply.send({ hello: 'world' })

// Run the server!
fastify.listen(3000, (err, address) => {
  if (err) throw err`server listening on ${address}`)

with async-await:

const fastify = require('fastify')({
  logger: true

fastify.get('/', async (request, reply) => {
  return { hello: 'world' }

fastify.listen(3000, (err, address) => {
  if (err) throw err`server listening on ${address}`)

Do you want to know more? Head to the Getting Started.

Quick start with Fastify CLI

Good tools make API development quicker and easier to maintain than doing everything manually.

The Fastify CLI is a command line interface tool that can create new projects, manage plugins, and perform a variety of development tasks testing and running the application.

The goal in this guide is to build and run a simple Fastify project, using the Fastify CLI, while adhering to the Style Guide recommendations that benefit every Fastify project.


Open a terminal window.

npm install fastify-cli --global

Generate a new project and default app by running the following command:

fastify generate

For more information, see the Fastify CLI documentation.

Fastify v1.x

Code for Fastify's v1.x is in Branch 1.x, so all Fastify 1.x related changes should be based on branch 1.x.


.listen binds to the local host, localhost, interface by default ( or ::1, depending on the operating system configuration). If you are running Fastify in a container (Docker, GCP, etc.), you may need to bind to Be careful when deciding to listen on all interfaces; it comes with inherent security risks. See the documentation for more information.

Core features

  • Highly performant: as far as we know, Fastify is one of the fastest web frameworks in town, depending on the code complexity we can serve up to 30 thousand requests per second.
  • Extendible: Fastify is fully extensible via its hooks, plugins and decorators.
  • Schema based: even if it is not mandatory we recommend to use JSON Schema to validate your routes and serialize your outputs, internally Fastify compiles the schema in a highly performant function.
  • Logging: logs are extremely important but are costly; we chose the best logger to almost remove this cost, Pino!
  • Developer friendly: the framework is built to be very expressive and help the developer in their daily use, without sacrificing performance and security.


Machine: MacBook Pro (Late 2016 | 2,7 GHz Intel Core i7 | 16 GB 2133 MHz LPDDR3)

Method:: autocannon -c 100 -d 5 -p 10 localhost:3000 * 2, taking the second average

Framework Version Router? Requests/sec
hapi 17.8.1 26,497
Express 4.16.4 26,481
Restify 7.2.3 22,968
Koa 2.6.2 35,796
Fastify 1.13.1 45,846
http.Server 10.13.0 43,542*

Benchmarks taken using This is a synthetic, "hello world" benchmark that aims to evaluate the framework overhead. The overhead that each framework has on your application depends on your application, you should always benchmark if performance matters to you.




  • Core - Core plugins maintained by the Fastify team.
  • Community - Community supported plugins.



Fastify is the result of the work of a great community. Team members are listed in alphabetical order.

Lead Maintainers


Past Collaborators


This project is kindly sponsored by:

Past Sponsors:


Licensed under MIT.

For your convenience, here is a list of all the licenses of our production dependencies:

  • MIT
  • ISC
  • BSD-3-Clause
  • BSD-2-Clause