Fast and low overhead web framework, for Node.js
npm install fastify
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.
- Quick start
- Install
- Example
- Core features
- Benchmarks
- Documentation
- Ecosystem
- Support
- Team
- Hosted by
- License
Create a folder and make it your current working directory:
``sh`
mkdir my-app
cd my-app
Generate a fastify project with npm init:
`sh`
npm init fastify
Install dependencies:
`sh`
npm i
To start the app in dev mode:
`sh`
npm run dev
For production mode:
`sh`
npm start
Under the hood npm init downloads and runs Fastify
Create, which in turn uses the
generate functionality of Fastify CLI.
To install Fastify in an existing project as a dependency:
`sh`
npm i fastify
`js
// 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:
`js
// 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.
If you learn best by reading code, explore the official demo.
> ## Note
> .listen binds to the local host, localhost, interface by default127.0.0.1
> ( or ::1, depending on the operating system configuration). If0.0.0.0
> you are running Fastify in a container (Docker,
> GCP, etc.), you may need to bind to . Be
> careful when listening on all interfaces; it comes with inherent
> security
> risks.
> See the documentation for more
> information.
- 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.
__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.
__________________________________________________- 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.
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][hd-link].
Fastify's supported version matrix is available in the
[Long Term Support][lts-link] documentation.
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.
_Fastify_ is the result of the work of a great community. Team members are
listed in alphabetical order.
Lead Maintainers:
* __Matteo Collina__,
* __Tomas Della Vedova__,
* __KaKa Ng__,
* __Manuel Spigolon__,
* __James Sumners__,
* __Tommaso Allevi__,
* __Ethan Arrowood__,
* __Çağatay Çalı__,
* __David Mark Clements__,
* __dalisoft__,
* __Dustin Deus__,
* __Denis Fäcke__,
* __Rafael Gonzaga__,
* __Trivikram Kamat__,
* __Ayoub El Khattabi__,
* __Cemre Mengu__,
* __Salman Mitha__,
* __Nathan Woltman__,
We are an At-Large
Project
in the OpenJS Foundation.
Support this project by becoming a SPONSOR!
Fastify has an Open Collective
page where we accept and manage financial contributions.
This project is kindly sponsored by:
- NearForm
- Platformatic
Past Sponsors:
- LetzDoIt
This list includes all companies that support one or more team members
in maintaining this project.
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
[hd-link]: https://www.herodevs.com/support/fastify-nes?utm_source=fastify&utm_medium=link&utm_campaign=github_readme
[lts-link]: https://fastify.dev/docs/latest/Reference/LTS/