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Submitted URL: http://fastify.io/
Effective URL: https://fastify.dev/
Submission: On July 21 via manual from US — Scanned from NL
Effective URL: https://fastify.dev/
Submission: On July 21 via manual from US — Scanned from NL
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Skip to main content HomeDocsEcosystemBenchmarksAdoptersContribute latest (v4.20.x) * latest (v4.20.x) * v4.20.x * v4.19.x * v4.18.x * v4.17.x * v4.16.x * v4.15.x * v4.14.x * v4.13.x * v4.12.x * v4.11.x * v4.10.x * v4.9.x * v4.8.x * v4.7.x * v4.6.x * v4.5.x * v4.4.x * v4.3.x * v4.2.x * v4.1.x * v4.0.x * v3.29.x * v2.15.x * v1.14.x ⌘K Search ... ⌘K FAST AND LOW OVERHEAD WEB FRAMEWORK, FOR NODE.JS WHY 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 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. WHO IS USING FASTIFY? Fastify is proudly powering a large ecosystem of organisations and products out there. Discover more organisations using Fastify. Do you want your organisation to be featured here? * * * * * * * * * * * * CORE FEATURES These are the main features and principles on which Fastify has been built: * 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. * 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 to help developers in their daily use, without sacrificing performance and security. * TypeScript ready: we work hard to maintain a TypeScript type declaration file so we can support the growing TypeScript community. QUICK START Get Fastify with NPM: npm install fastify Then create server.js and add the following content: * ESM * CJS // Import the framework and instantiate it import Fastify from 'fastify' const fastify = Fastify({ logger: true }) // Declare a route fastify.get('/', async function handler (request, reply) { return { hello: 'world' } }) // Run the server! try { await fastify.listen({ port: 3000 }) } catch (err) { fastify.log.error(err) process.exit(1) } // Require the framework and instantiate it const fastify = require('fastify')({ logger: true }) // Declare a route fastify.get('/', function handler (request, reply) { reply.send({ hello: 'world' }) }) // Run the server! fastify.listen({ port: 3000 }, (err) => { if (err) { fastify.log.error(err) process.exit(1) } }) Finally, launch the server with: node server and test it with: curl http://localhost:3000 USING CLI Get the fastify-cli to create a new scaffolding project: npm install --global fastify-cli fastify generate myproject REQUEST/RESPONSE VALIDATION AND HOOKS Fastify can do much more than this. For example, you can easily provide input and output validation using JSON Schema and perform specific operations before the handler is executed: * ESM * CJS import Fastify from 'fastify' const fastify = Fastify({ logger: true }) fastify.route({ method: 'GET', url: '/', schema: { // request needs to have a querystring with a `name` parameter querystring: { type: 'object', properties: { name: { type: 'string'} }, required: ['name'], }, // the response needs to be an object with an `hello` property of type 'string' response: { 200: { type: 'object', properties: { hello: { type: 'string' } } } } }, // this function is executed for every request before the handler is executed preHandler: async (request, reply) => { // E.g. check authentication }, handler: async (request, reply) => { return { hello: 'world' } } }) try { await fastify.listen({ port: 3000 }) } catch (err) { fastify.log.error(err) process.exit(1) } const fastify = require('fastify')({ logger: true }) fastify.route({ method: 'GET', url: '/', schema: { // request needs to have a querystring with a `name` parameter querystring: { type: 'object', properties: { name: { type: 'string'} }, required: ['name'], }, // the response needs to be an object with an `hello` property of type 'string' response: { 200: { type: 'object', properties: { hello: { type: 'string' } } } } }, // this function is executed for every request before the handler is executed preHandler: (request, reply, done) => { // E.g. check authentication done() }, handler: (request, reply) => { reply.send({ hello: 'world' }) } }) fastify.listen({ port: 3000 }, (err) => { if (err) { fastify.log.error(err) process.exit(1) } }) TYPESCRIPT SUPPORT Fastify is shipped with a typings file, but you may need to install @types/node, depending on the Node.js version you are using. The following example creates a http server. We pass the relevant typings for our http version used. By passing types we get correctly typed access to the underlying http objects in routes. If using http2 we would pass <http2.Http2Server, http2.Http2ServerRequest, http2.Http2ServerResponse>. For https pass http2.Http2SecureServer or http.SecureServer instead of Server. This ensures within the server handler we also get http.ServerResponse with correct typings on reply.res. * TypeScript import Fastify, { FastifyInstance, RouteShorthandOptions } from 'fastify' import { Server, IncomingMessage, ServerResponse } from 'http' const server: FastifyInstance = Fastify({}) const opts: RouteShorthandOptions = { schema: { response: { 200: { type: 'object', properties: { pong: { type: 'string' } } } } } } server.get('/ping', opts, async (request, reply) => { return { pong: 'it worked!' } }) const start = async () => { try { await server.listen({ port: 3000 }) const address = server.server.address() const port = typeof address === 'string' ? address : address?.port } catch (err) { server.log.error(err) process.exit(1) } } start() Visit the Documentation to learn more about all the features that Fastify has to offer. A FAST WEB FRAMEWORK Leveraging our experience with Node.js performance, Fastify has been built from the ground up to be as fast as possible. Have a look at our benchmarks section to compare Fastify performance to other common web frameworks. Check out our benchmarks ECOSYSTEM Fastify has an ever-growing ecosystem of plugins. Probably there is already a plugin for your favourite database or template language. Have a look at the Ecosystem page to navigate through the currently available plugins. Can't you find the plugin you are looking for? No problem, it's very easy to write one! Explore 270 plugins MEET THE TEAM In alphabetical order LEAD MAINTAINERS Matteo Collina Tomas Della Vedova COLLABORATORS Tommaso Allevi Ayoub El Khattabi David Clements Dustin Deus Carlos Fuentes Rafael Gonzaga Vincent Le Goff Luciano Mammino Salman Mitha Igor Savin Evan Shortiss Maksim Sinik Frazer Smith Manuel Spigolon James Sumners PAST COLLABORATORS Ethan Arrowood Çağatay Çalı Cemre Mengu Trivikram Kamat Nathan Woltman ACKNOWLEDGMENTS This project is kindly sponsored by: * NearForm * Platformatic Past Sponsors: * LetzDoIt * Microsoft Also thanks to: * The amazing Fastify community HOSTED BY We are an At Large project at the OpenJS Foundation Docs * Getting Started Community * Stack Overflow * Discord * Twitter More * GitHub Fastify, Copyright © 2016-2023 OpenJS Foundation and The Fastify team, Licensed under MIT