Fastify
Fast and low-overhead web framework for Node.js with excellent performance and developer experience.
HTTP servers and APIs npm MIT
Used in agent projects
27
0.2% of 12,697 public repos built with AI coding agents
Rank in http servers and apis
#29 of 30
by use in those projects
Downloads
15.3M
npm, last 7 days, fastify
GitHub stars
37.2K
last push Oct 10, 2026
How Fastify is used
Fastify is a dependency in 27 of the 12,697 public GitHub projects set up for AI coding agents that we scanned (0.2%), #29 of 30 in http servers and apis. The most used alternative there is Express. Projects that use it most often also use tsx (63.0%), Vitest (51.9%), dotenv (51.9%).
Often used with Fastify
| tsx | 63.0% of Fastify projects · 6.3× more than average |
|---|---|
| Vitest | 51.9% of Fastify projects · 4.3× more than average |
| dotenv | 51.9% of Fastify projects · 3.3× more than average |
| Prettier | 51.9% of Fastify projects · 3.0× more than average |
| TypeScript | 88.9% of Fastify projects · 1.6× more than average |
| Zod | 48.1% of Fastify projects · 2.8× more than average |
| pg | 29.6% of Fastify projects · 10.1× more than average |
| ESLint | 55.6% of Fastify projects · 1.5× more than average |
By coding agent
| Claude Code | 0.3% of projects set up for it |
|---|---|
| Cursor | 0.3% of projects set up for it |
| GitHub Copilot | 0.2% of projects set up for it |
Share of public repos configured for each agent that list Fastify as a dependency.
Install
| Package | npm install fastify |
|---|---|
| Main stacks | TypeScript / JavaScript (27) |
| Example projects | 195440/codex-to-cursor, Uniswap/smallocator, flaviodelgrosso/fastify-mcp-server, juanfran/tapiz, DiegoFleitas/letterboxd-movie-justwatch |
Alternatives to Fastify
| Tool | Used in agent projects | Downloads / wk | GitHub stars | License |
|---|---|---|---|---|
| Express npm Fast, unopinionated minimalist web framework for Node.js. |
822 (6.5%) | 142M | 69.6K | MIT |
| Uvicorn pypi Lightning-fast ASGI server for running async Python web applications. |
544 (4.3%) | 13M | 11K | — |
| FastAPI pypi High-performance Python web framework with automatic API docs and async support. |
537 (4.2%) | 107M | 103K | — |
| cors npm Express/Node.js middleware for handling Cross-Origin Resource Sharing. |
422 (3.3%) | 86.8M | 6,195 | MIT |
| python-multipart pypi Streaming multipart parser for handling file uploads in Python web frameworks. |
217 (1.7%) | 92.8M | 536 | — |
| Flask pypi Lightweight Python web framework for building web applications and APIs. |
174 (1.4%) | 40.9M | 75K | — |
| Hono npm Ultrafast web framework for edge runtimes built on Web Standards. |
136 (1.1%) | 73.9M | 32.5K | MIT |
| express-rate-limit npm Express middleware for rate limiting API requests by IP address. |
105 (0.8%) | 57.6M | 3,311 | MIT |