fastify/fastify-swagger

Health v2 · maintenance only

Adoption not part of the score

1092 stars · 219 forks observed · 2026-09-03

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A Fastify plugin that automatically generates and serves Swagger (OpenAPI v2) or OpenAPI v3 schemas from your route schemas or an existing spec. It pairs with UI plugins like @fastify/swagger-ui to serve interactive API documentation.

Use cases

• generate openapi spec from fastify routes
• serve swagger documentation for a nodejs api
• auto-generate api docs from json schemas
• publish openapi v3 schema for a rest api
• document fastify endpoints with swagger
• expose swagger json endpoint for codegen

When to choose

• you use Fastify and want API docs generated from route schemas
• you need OpenAPI v2 or v3 output for clients or tooling
• you want a spec-first or schema-first documentation workflow in Node.js

When to avoid

• you use Express, Koa, or another non-Fastify framework
• you want a built-in Swagger UI - use @fastify/swagger-ui alongside it
• you need to generate routes from an existing OpenAPI schema - use fastify-openapi-glue

Facets

plugin · maturity active

api-documentation documentation middleware plugin-system web-development backend apis documentation developer-tools fastify swagger openapi openapi-v3 api-specs route-schemas nodejs web-server javascript

Member repositories

For agents

markdown · JSON · MCP: product_card(name="fastify/fastify-swagger")