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An efficient server implies a lower cost of the infrastructure, 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 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.
The main branch refers to the Fastify v5 release.
Check out the 4.x branch for v4.
Table of Contents
Quick start
Create a folder and make it your current working directory:
mkdir my-app
cd my-app
Generate a fastify project with npm init:
npm init fastify
Install dependencies:
npm i
To start the app in dev mode:
npm run dev
For production mode:
npm start
Under the hood npm init downloads and runs Fastify
Create, which in turn uses the
generate functionality of Fastify CLI.
Install
To install Fastify in an existing project as a dependency:
npm i fastify
Example
// Require the framework and instantiate it
// ESM
import Fastify from 'fastify'
const fastify = Fastify({
logger: true
})
// CommonJs
const fastify = require('fastify')({
logger: true
})
// Declare a route
fastify.get('/', (request, reply) => {
reply.send({ hello: 'world' })
})
// Run the server!
fastify.listen({ port: 3000 }, (err, address) => {
if (err) throw err
// Server is now listening on ${address}
})
With async-await:
// ESM
import Fastify from 'fastify'
const fastify = Fastify({
logger: true
})
// CommonJs
const fastify = require('fastify')({
logger: true
})
fastify.get('/', async (request, reply) => {
reply.type('application/json').code(200)
return { hello: 'world' }
})
fastify.listen({ port: 3000 }, (err, address) => {
if (err) throw err
// Server is now listening on ${address}
})
Do you want to know more? Head to the <a
href="./docs/Guides/Getting-Started.md"><code><b>Getting Started</b></code></a>.
If you learn best by reading code, explore the official demo.
Note
.listen binds to the local host, localhost, interface by default
(127.0.0.1 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 0.0.0.0. Be
careful when listening 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 76+
thousand requests per second.
- Extensible: Fastify is fully extensible via its hooks, plugins, and
decorators.
- Schema-based: even if it is not mandatory we recommend using 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
developers in their daily use without sacrificing performance and
security.
Benchmarks
Machine: EX41S-SSD, Intel Core i7, 4Ghz, 64GB RAM, 4C/8T, SSD.
Method:: autocannon -c 100 -d 40 -p 10 localhost:3000 * 2, taking the
second average
| Framework | Version | Router? | Requests/sec |
| :----------------- | :------------------------- | :----------: | ------------: |
| Express | 4.17.3 | ✓ | 14,200 |
| hapi | 20.2.1 | ✓ | 42,284 |
| Restify | 8.6.1 | ✓ | 50,363 |
| Koa | 2.13.0 | ✗ | 54,272 |
| Fastify | 4.0.0 | ✓ | 77,193 |
| - | | | |
| http.Server | 16.14.2 | ✗ | 74,513 |
These benchmarks taken using https://github.com/fastify/benchmarks. 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.
Documentation
Ecosystem
- Core - Core plugins maintained by the
Fastify team.
- Community - Community-supported
plugins.
- Live Examples - Multirepo with a broad
set of real working examples.
- Discord - Join our discord server and chat with
the maintainers.
Support
Please visit Fastify help to view prior
support issues and to ask new support questions.
Version 3 of Fastify and lower are EOL and will not receive any security or bug fixes.
Fastify's partner, HeroDevs, provides commercial security fixes for all
unsupported versions at https://herodevs.com/support/fastify-nes.
Fastify's supported version matrix is available in the
Long Term Support documentation.
Contributing
Whether reporting bugs, discussing improvements and new ideas, or writing code,
we welcome contributions from anyone and everyone. Please read the CONTRIBUTING
guidelines before submitting pull requests.
Team
Fastify is the result of the work of a great community. Team members are
listed in alphabetical order.
Lead Maintainers:
Fastify Core team
- Aras Abbasi,
https://www.npmjs.com/~uzlopak
- Harry Brundage,
https://twitter.com/harrybrundage, https://www.npmjs.com/~airhorns
- Matteo Collina,
https://twitter.com/matteocollina, https://www.npmjs.com/~matteo.collina
- Gürgün Dayıoğlu,
https://www.npmjs.com/~gurgunday
- Tomas Della Vedova,
https://twitter.com/delvedor, https://www.npmjs.com/~delvedor
- Carlos Fuentes,
https://twitter.com/metcoder95, https://www.npmjs.com/~metcoder95
- Vincent Le Goff
- Luciano Mammino,
https://twitter.com/loige, https://www.npmjs.com/~lmammino
- Jean Michelet,
https://www.npmjs.com/~jean-michelet
- KaKa Ng,
https://www.npmjs.com/~climba03003
- Luis Orbaiceta,
https://twitter.com/luisorbai, https://www.npmjs.com/~luisorbaiceta
- Maksim Sinik,
https://twitter.com/maksimsinik, https://www.npmjs.com/~fox1t
- Manuel Spigolon,
https://twitter.com/manueomm, https://www.npmjs.com/~eomm
- James Sumners,
https://twitter.com/jsumners79, https://www.npmjs.com/~jsumners
Fastify Plugins team
- Harry Brundage,
https://twitter.com/harrybrundage, https://www.npmjs.com/~airhorns
- Simone Busoli,
https://twitter.com/simonebu, https://www.npmjs.com/~simoneb
- Dan Castillo,
https://www.npmjs.com/~dancastillo
- Matteo Collina,
https://twitter.com/matteocollina, https://www.npmjs.com/~matteo.collina
- Gürgün Dayıoğlu,
https://www.npmjs.com/~gurgunday
- Tomas Della Vedova,
https://twitter.com/delvedor, https://www.npmjs.com/~delvedor
- Carlos Fuentes,
https://twitter.com/metcoder95, https://www.npmjs.com/~metcoder95
- Vincent Le Goff
- Jean Michelet,
https://www.npmjs.com/~jean-michelet
- KaKa Ng,
https://www.npmjs.com/~climba03003
- Maksim Sinik,
https://twitter.com/maksimsinik, https://www.npmjs.com/~fox1t
- Frazer Smith, https://www.npmjs.com/~fdawgs
- Manuel Spigolon,
https://twitter.com/manueomm, https://www.npmjs.com/~eomm
Emeritus Contributors
Great contributors to a specific area of the Fastify ecosystem will be invited
to join this group by Lead Maintainers when they decide to step down from the
active contributor's group.
- Tommaso Allevi,
https://twitter.com/allevitommaso, https://www.npmjs.com/~allevo
- Ethan Arrowood,
https://twitter.com/arrowoodtech, https://www.npmjs.com/~ethan_arrowood
- Çağatay Çalı,
https://twitter.com/cagataycali, https://www.npmjs.com/~cagataycali
- David Mark Clements,
https://twitter.com/davidmarkclem,
https://www.npmjs.com/~davidmarkclements
- dalisoft, https://twitter.com/dalisoft,
https://www.npmjs.com/~dalisoft
- Dustin Deus,
https://twitter.com/dustindeus, https://www.npmjs.com/~starptech
- Denis Fäcke,
https://twitter.com/serayaeryn, https://www.npmjs.com/~serayaeryn
- Rafael Gonzaga,
https://twitter.com/_rafaelgss, https://www.npmjs.com/~rafaelgss
- Trivikram Kamat,
https://twitter.com/trivikram, https://www.npmjs.com/~trivikr
- Ayoub El Khattabi,
https://twitter.com/ayoubelkh, https://www.npmjs.com/~ayoubelk
- Cemre Mengu,
https://twitter.com/cemremengu, https://www.npmjs.com/~cemremengu
- Salman Mitha,
https://www.npmjs.com/~salmanm
- Nathan Woltman,
https://twitter.com/NathanWoltman, https://www.npmjs.com/~nwoltman
Hosted by
<img
src="https://github.com/openjs-foundation/artwork/blob/main/openjs_foundation/openjs_foundation-logo-horizontal-color.png?raw=true"
width="250px;"/>
We are an At-Large
Project
in the OpenJS Foundation.
Sponsors
Support this project by becoming a SPONSOR!
Fastify has an Open Collective
page where we accept and manage financial contributions.
Acknowledgments
This project is kindly sponsored by:
Past Sponsors:
This list includes all companies that support one or more team members
in maintaining this project.
License
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