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Express.js vs Fastify
A detailed comparison to help you choose between Express.js and Fastify.
| Feature | Express.js | Fastify |
|---|---|---|
| Pricing Model | Open Source | Open Source |
| Free Tier | Yes | Yes |
| Monthly Cost (Solo) | $0 | $0 |
| Target Audience | developers | developers |
| Verified | Yes | Yes |
| Solo-Friendly | Yes | Yes |
| Open Source | Yes | Yes |
| Editorial Rating | 4/5 | 4.3/5 |
| Categories | Developer Tools | Developer Tools |
| Key Features | Routing, Middleware, Template Engines, Static Files, Error Handling | JSON Schema Validation, Plugin System, TypeScript Support, Logging with Pino, Hooks Lifecycle |
| Free Tier Quality | excellent | excellent |
Pricing Breakdown
Express.js
Completely free and open-source under the MIT license. No commercial products, no paid tiers, no vendor lock-in. Supported by the OpenJS Foundation.
Fastify
Completely free and open-source under the MIT license. No commercial products or paid tiers. Maintained by the Fastify team and community contributors.
Integration Overlap
Shared Integrations (6)
Only in Express.js (4)
Only in Fastify (4)
Use Case Fit
Overlapping Use Cases (1)
Express.js
- * REST API development
- * Server-side rendering
- * Real-time applications with Socket.io
- * Full-stack applications
Fastify
- * High-performance REST APIs
- * Real-time applications
- * Serverless functions
- * API gateways
Express.js
Pros
- + Massive ecosystem with thousands of middleware packages
- + Extremely well-documented with tutorials everywhere
- + Battle-tested in production at every scale
- + Simple learning curve for beginners
- + Flexible and unopinionated architecture
Cons
- - No built-in TypeScript support requires extra setup
- - Callback-based API feels dated compared to modern frameworks
- - No built-in validation or schema support
- - Performance lags behind Hono Fastify and Elysia
- - Security middleware must be added manually
Fastify
Pros
- + 3-5x faster than Express in benchmarks
- + Built-in JSON Schema validation saves middleware bloat
- + First-class TypeScript support
- + Excellent plugin architecture with encapsulation
- + Built-in structured logging with Pino
Cons
- - Smaller ecosystem than Express
- - Plugin encapsulation has a learning curve
- - Fewer tutorials and community resources
- - Some Express middleware not directly compatible
- - Decorators pattern can feel unfamiliar
Editorial Verdict
Both tools are evenly matched on price. Express.js excels at rest api development, while Fastify is stronger for high-performance rest apis.
SaaSLens Editorial Team
Editorial Team