Fastify v5.x · Node.js 20+

Fast and low overhead.
For Node.js.

Fastify is a web framework focused on the best developer experience with the least overhead. A powerful plugin architecture, schema-based speed, and one of the fastest cores in Node.js.

Get started

$npm install fastify

downloads / mo: 0
github stars: 0
plugins: 297

throughput

1.7x

vs express

types included

trusted by

// why fastify

Efficiency is a feature

An efficient server keeps your infrastructure costs low, stays responsive under load, and leaves your users happy. Fastify is built to serve as many requests as possible without compromising on security, validation, or developer experience. Inspired by Hapi and Express, it's one of the fastest web frameworks around.

// core features

Built on solid principles

~60k req/s

Highly performant

One of the fastest web frameworks in town. Depending on code complexity, Fastify can serve around 60 thousand requests per second.

hooks · plugins

Extensible

Fully extensible via its hooks, plugins, and decorators. Encapsulation keeps your components isolated and reusable.

JSON Schema

Schema based

Use JSON Schema to validate routes and serialize outputs. Internally Fastify compiles the schema into a highly performant function.

Pino built-in

Logging

Logs are important but costly. We chose the fastest logger, Pino, to almost entirely remove that cost.

DX first

Developer friendly

Expressive by design, built to help developers in daily use without sacrificing performance or security.

types included

TypeScript ready

We work hard to maintain a TypeScript type declaration file to support the growing TypeScript community.

// quick start

Type-safe from the start

Install Fastify and TypeBox, then create server.ts. The same schema validates incoming data, serializes the response, and infers the request type for your handler.

$npm install fastify @fastify/type-provider-typebox typebox

Explore the full documentation

import Fastify from 'fastify'
import { Type } from 'typebox'
import type { TypeBoxTypeProvider } from '@fastify/type-provider-typebox'

const fastify = Fastify({ logger: true })
  .withTypeProvider<TypeBoxTypeProvider>()

fastify.get('/', {
  schema: {
    querystring: Type.Object({
      name: Type.Optional(Type.String()),
    }),
    response: {
      200: Type.Object({
        hello: Type.String(),
      }),
    },
  },
}, async (request) => {
  return { hello: request.query.name ?? 'world' }
})

await fastify.listen({ port: 3000 })