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Overview
Fastify is a web framework for Node.js focused on low overhead and developer experience. Hooks, plugins, and decorators provide extension points, while JSON Schema can drive request validation and response serialization and Pino provides structured logging.
Features and best fit
Based on official documentation; not hands-on tested · Content checked:
Key features
Split server behavior across hooks, plugins, and decorators
Fastify exposes hooks, plugins, and decorators so concerns such as authentication, data access, and shared request behavior can be separated from individual route handlers and reused.
Sources: [1]
Use JSON Schema for validation and response serialization
Routes can define JSON Schema for query strings, parameters, bodies, and responses. Fastify compiles schemas into functions used during validation and serialization.
Integrate Pino logging into the request lifecycle
Fastify's logger configuration uses Pino, allowing request handling and application logs to be captured through the same Node.js server stack.
Sources: [1]
Best fit
Fits Node.js APIs that need both performance and modular server structure
It is useful for REST APIs and web services where routing, validation, logging, and plugin boundaries should follow one framework model while performance is measured against the real application workload.
Sources: [1]
Before adoption
Fastify v5 requires Node.js 20 or newer
The v5 migration guide requires Node.js 20+ and documents removals of deprecated v4 APIs, including the requirement for full JSON Schema definitions for query strings, parameters, bodies, and responses.
Sources: [2]
v5.12.5 is a security release
Fastify v5.12.5 includes a security fix. Deployments pinned to older v5 patches should evaluate an update to the current security release together with normal compatibility testing.
Sources: [3]
Official sources
- [1]Fastify v5.12.5 README(2026-10-04)
- [2]Fastify v5 migration guide(2026-10-04)
- [3]Fastify v5.12.5 release(2026-10-04)
- [4]Fastify MIT license(2026-10-04)
Supplemental curator note
Fastify is easier to evaluate as a complete server model for schemas, plugins, and logging than as a simple 'faster Express' comparison. Version 5.12.5 is a security release, so v5 deployments should avoid remaining on older patches without a specific reason.
Try it in 3 steps
- 1
Add Fastify 5.12.5 to a Node.js 20+ project
Fastify v5 requires Node.js 20 or newer. Pin the reviewed v5.12.5 release in a minimal project.
node --version && mkdir -p fastify-demo && cd fastify-demo && npm init -y && npm install fastify@5.12.5 - 2
Create a minimal JSON server
Follow the README pattern with logging and a single GET route.
cd fastify-demo && printf 'const fastify = require("fastify")({ logger: true })\nfastify.get("/", async () => ({ hello: "world" }))\nfastify.listen({ port: 3000 })\n' > server.js - 3
Start the local server
Open the localhost address printed at startup and confirm that the route returns
{"hello":"world"}.cd fastify-demo && node server.js
Growth
Growth trends · Last 30 days
37,227 Stars
Trend data is still being collected.
Development activity
Last 90 days · weekly
- Commits (last 30 days)
- 21
- Open PRs
- 103
Development activity is still being collected.
Built with
Categories and tags
GitHub data
GitHub dataView detailed GitHub data
GitHub Topics
- webframework
- performance
- speed
- nodejs
- hacktoberfest
- fastify
- fastify-core
- Stars
- 37,227
- Forks
- 3,045
- Watchers
- 369
- Open issues
- 57
- Contributors
- 431
- Owner type
- Organization
- Primary language
- JavaScript
- License
- MIT
- Repository last updated
- Oct 1, 2026
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