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ExpressvsFastify

Express vs Fastify ComparisonThe battle-tested default vs the modern default: picking your Node.js HTTP framework

Express has been the default Node.js framework since 2010. Its middleware model is understood by virtually every Node.js developer, and its ecosystem covers every use case imaginable. The problem is it was designed before TypeScript, before async/await, and before performance became a first-class concern. Fastify was built specifically to fix those gaps: schema-based validation, native TypeScript support, and a plugin system that avoids the footguns in Express middleware. For new Node.js APIs in 2025, Fastify is the better starting point. Express still wins for brownfield projects, teams who want zero onboarding friction, and apps where the ecosystem fit matters more than raw throughput.

Head-to-head summary

2
Express wins
0
Ties
5
Fastify wins

Detailed comparison

Performance
Express
Slow: no schema validation, unoptimised JSON serialisation
Fastify
2–3× faster than Express: JSON schema serialisation is highly optimised
TypeScript support
Express
Community types only: @types/express bolted on after the fact
Fastify
TypeScript-first: full type inference on request/response schemas
Request validation
Express
None built-in: use express-validator or Joi separately
Fastify
Built-in: JSON Schema validation on routes, errors thrown automatically
Ecosystem size
Express
Enormous: npm has an Express middleware for virtually everything
Fastify
Smaller but growing: covers most common use cases via plugins
Learning curve
Express
Minimal: most Node.js developers already know Express
Fastify
Low: familiar concepts, but plugin model and schemas need learning
Plugin architecture
Express
Middleware is order-dependent and easy to get wrong
Fastify
Encapsulated plugins with lifecycle hooks: more predictable composition
OpenAPI / docs
Express
Manual: swagger-ui-express wired up separately
Fastify
Automatic: @fastify/swagger generates OpenAPI from route schemas

Our verdict

We recommend: Fastify

Fastify is the better choice for new Node.js APIs. Its built-in JSON schema validation, 2–3× throughput advantage, and TypeScript-first design make it the stronger foundation for anything you're starting today. Express remains worth choosing when you're extending an existing Express codebase, when you need a specific Express middleware with no Fastify equivalent, or when your team simply doesn't have bandwidth to learn a new framework.

When to choose each

Choose Express when:

  • You're adding to or extending an existing Express codebase
  • You need a specific Express middleware that has no maintained Fastify equivalent
  • Your team knows Express deeply and has zero runway for framework onboarding
  • You're prototyping quickly and ecosystem breadth matters more than performance

Choose Fastify when:

  • You're starting a new Node.js API from scratch in 2025
  • Performance matters: high-throughput APIs, serverless functions with cold starts
  • You want request and response validation with zero boilerplate
  • Your team is TypeScript-first and wants type inference on route schemas

Frequently asked questions

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