# fastify/fastify

Fast and low overhead web framework, for Node.js

Repository: https://github.com/fastify/fastify
Canonical: https://ross.abutalabs.com/products/fastify
Homepage: https://www.fastify.dev
Language: JavaScript
License: MIT
License Family: permissive
Topics: webframework, performance, speed, nodejs, hacktoberfest, fastify, fastify-core
Last push: 2026-08-23T18:19:15+00:00

## Health v2 (maintenance only)
Score: 99/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 98, longevity 100
- inputs: {"age_days": 3626, "days_push": 10, "days_rel": 15, "gap_med": 12.0, "n_releases_24m": 35}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 37025, forks 2990 (observed 2026-08-28T04:12:01.286659+00:00)

## What it is
Fastify is a fast, low-overhead web framework for Node.js with a powerful plugin architecture, JSON Schema-based validation and serialization, and built-in Pino logging. It is inspired by Hapi and Express and is among the fastest Node.js web frameworks available.

## Use cases
- build a fast REST API in Node.js
- replace Express with a lower-overhead web framework
- validate request bodies with JSON Schema
- build a modular backend with plugin encapsulation
- serve high-throughput HTTP endpoints
- create a TypeScript-ready web server

## When to choose
- you need maximum HTTP throughput in Node.js
- you want schema-based validation and serialization out of the box
- you value a strong plugin ecosystem and encapsulation model
- you want built-in fast logging via Pino

## When to avoid
- you need a full-stack framework with SSR or batteries included
- your team is already invested in Express middleware that is incompatible
- you are building a non-Node.js backend

## Facets
- artifact type: framework
- maturity: stable
- function: web-framework, http-server, routing, middleware, serialization, logging, plugin-system
- domain: web-development, backend, apis, developer-tools
- platform: cross-platform
- tags: json-schema-validation, typescript, performance, low-overhead, rest-api, nodejs

## Member repositories
- fastify/fastify (main) score 99

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:12:01.286659+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T16:25:45.349897+00:00, confidence not recorded.
  - readme: https://github.com/fastify/fastify (fetched 2026-08-28T04:12:01.286659+00:00, sha e954546f9118)
  - homepage: https://www.fastify.dev (fetched 2026-08-29T07:47:44.198711+00:00, sha 48ecbee02c2c)
  - site_page: https://fastify.dev/docs/latest (fetched 2026-08-29T07:47:44.208108+00:00, sha 9477e1cc0a1c)
  - site_page: https://fastify.dev/docs/latest/Reference/LTS (fetched 2026-08-29T07:47:44.210076+00:00, sha bb1bd83f5f67)
  - site_page: https://fastify.dev/docs/latest/Guides/Getting-Started (fetched 2026-08-29T07:47:44.211916+00:00, sha 407610e18a68)
  - site_page: https://fastify.dev/docs/latest/Reference (fetched 2026-08-29T07:47:44.214329+00:00, sha 995a02e7bad2)
- Data as of 2026-08-30T08:39:29.467469+00:00.