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.
The main
branch refers to the Fastify v5
release, which is not released/LTS yet.
Check out the 4.x
branch for v4
.
Table of Contents
- Quick start
- Install
- Example
- Core features
- Benchmarks
- Documentation
- Ecosystem
- Support
- Team
- Hosted by
- License
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:
Install with npm:
npm i fastify
Install with yarn:
yarn add 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 Getting Started
.
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 to0.0.0.0
. 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 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 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.
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 |
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
Getting Started
Guides
Server
Routes
Encapsulation
Logging
Middleware
Hooks
Decorators
Validation and Serialization
Fluent Schema
Lifecycle
Reply
Request
Errors
Content Type Parser
Plugins
Testing
Benchmarking
How to write a good plugin
Plugins Guide
HTTP2
Long Term Support
TypeScript and types support
Serverless
Recommendations
中文文档地址
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.
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:
- Matteo Collina, https://twitter.com/matteocollina, https://www.npmjs.com/~matteo.collina
- Tomas Della Vedova, https://twitter.com/delvedor, https://www.npmjs.com/~delvedor
- Manuel Spigolon, https://twitter.com/manueomm, https://www.npmjs.com/~eomm
- James Sumners, https://twitter.com/jsumners79, https://www.npmjs.com/~jsumners
Fastify Core team
- Tommaso Allevi, https://twitter.com/allevitommaso, https://www.npmjs.com/~allevo
- Harry Brundage, https://twitter.com/harrybrundage, https://www.npmjs.com/~airhorns
- David Mark Clements, https://twitter.com/davidmarkclem, https://www.npmjs.com/~davidmarkclements
- Matteo Collina, https://twitter.com/matteocollina, https://www.npmjs.com/~matteo.collina
- Tomas Della Vedova, https://twitter.com/delvedor, https://www.npmjs.com/~delvedor
- Dustin Deus, https://twitter.com/dustindeus, https://www.npmjs.com/~starptech
- Ayoub El Khattabi, https://twitter.com/ayoubelkh, https://www.npmjs.com/~ayoubelk
- Denis Fäcke, https://twitter.com/serayaeryn, https://www.npmjs.com/~serayaeryn
- 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
- 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
- Aras Abbasi, https://www.npmjs.com/~uzlopak
- Gürgün Dayıoğlu, https://www.npmjs.com/~gurgunday
Fastify Plugins team
- Matteo Collina, https://twitter.com/matteocollina, https://www.npmjs.com/~matteo.collina
- Harry Brundage, https://twitter.com/harrybrundage, https://www.npmjs.com/~airhorns
- Tomas Della Vedova, https://twitter.com/delvedor, https://www.npmjs.com/~delvedor
- Ayoub El Khattabi, https://twitter.com/ayoubelkh, https://www.npmjs.com/~ayoubelk
- Carlos Fuentes, https://twitter.com/metcoder95, https://www.npmjs.com/~metcoder95
- Vincent Le Goff
- Salman Mitha, https://www.npmjs.com/~salmanm
- 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
- Simone Busoli, https://twitter.com/simonebu, https://www.npmjs.com/~simoneb
- Gürgün Dayıoğlu, https://www.npmjs.com/~gurgunday
- Dan Castillo, https://www.npmjs.com/~dancastillo
- Jean Michelet, https://www.npmjs.com/~jean-michelet
Great Contributors
Great contributors on a specific area in the Fastify ecosystem will be invited to join this group by Lead Maintainers.
- dalisoft, https://twitter.com/dalisoft, https://www.npmjs.com/~dalisoft
- Luciano Mammino, https://twitter.com/loige, https://www.npmjs.com/~lmammino
- Evan Shortiss, https://twitter.com/evanshortiss, https://www.npmjs.com/~evanshortiss
Past Collaborators
- Çağatay Çalı, https://twitter.com/cagataycali, https://www.npmjs.com/~cagataycali
- Trivikram Kamat, https://twitter.com/trivikram, https://www.npmjs.com/~trivikr
- Cemre Mengu, https://twitter.com/cemremengu, https://www.npmjs.com/~cemremengu
- Nathan Woltman, https://twitter.com/NathanWoltman, https://www.npmjs.com/~nwoltman
- Ethan Arrowood, https://twitter.com/arrowoodtech, https://www.npmjs.com/~ethan_arrowood
- Rafael Gonzaga, https://twitter.com/_rafaelgss, https://www.npmjs.com/~rafaelgss
Hosted by
We are a 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.
Acknowledgements
This project is kindly sponsored by:
Past Sponsors:
This list includes all companies that support one or more of the team members in the maintenance of 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