Fastify is a fast, low-overhead web framework for Node.js designed to deliver high performance and a developer-friendly experience with minimal infrastructure cost.

The main features and capabilities of Fastify include:

• High Performance & Throughput: Delivers up to 89,000 requests per second (89k req/s), outperforming common Node.js frameworks such as Express (approx. 1.4x faster), Hono, H3, Koa, Restify, and Hapi.

• Extensible Plugin Architecture: Provides an encapsulated architecture that keeps components isolated and reusable, supported by an ecosystem of nearly 300 official and community plugins (such as @fastify/cors, @fastify/static, @fastify/rate-limit, and @fastify/cookie).

• Schema-Based Validation & Serialization: Compiles JSON Schema definitions into performant internal functions to validate incoming route parameters and serialize response outputs.

• Low-Overhead Logging: Built with Pino, one of the fastest logging libraries available, to log server activity while almost completely eliminating performance penalties.

• TypeScript Integration: Provides built-in TypeScript definitions and type-provider support (such as TypeBox) that automatically validates incoming data, serializes responses, and infers handler request types.

• OpenJS Foundation Governance: Maintained as an OpenJS Foundation project by a global team of core maintainers and open-source collaborators.