Backend Frameworks · comparison
Express vs Fastify
Both Express and Fastify are backend frameworks. Here's how they compare at a glance — and remember you can add both to your stack and ask Smart Stack a question grounded in each one's current docs.
| Attribute | Express | Fastify |
|---|---|---|
| Category | Backend Frameworks | Backend Frameworks |
| Language | JavaScript | JavaScript |
| First released | 2010 | 2016 |
| License | MIT | MIT |
| Latest version | v4.21.0 | v5.1.0 |
| Pages indexed | 140 | 170 |
| Documentation | Express docs → | Fastify docs → |
When to choose Express
Choose Express when you want the most battle-tested, widely-known Node.js framework with a vast middleware ecosystem.
Explore Express docs →When to choose Fastify
Choose Fastify when throughput and schema-driven validation matter and you want a modern alternative to Express.
Explore Fastify docs →$ smart-stack ask
Still deciding between Express and Fastify?
Add both to your stack and ask Smart Stack. It pulls from each tool's official docs — ideal when you're weighing a choice or planning a migration.
>Should I use Express or Fastify for my project?
Compare in Smart StackExpress vs Fastify — FAQ
What is the difference between Express and Fastify?
Express — Fast, unopinionated, minimalist web framework for Node.js. Fastify — Fast and low overhead web framework for Node.js. Both sit in the backend frameworks space; the right pick depends on your constraints, which the comparison above breaks down.
Is Express better than Fastify?
Neither is universally "better." Choose Express when you want the most battle-tested, widely-known Node.js framework with a vast middleware ecosystem. Choose Fastify when throughput and schema-driven validation matter and you want a modern alternative to Express. Ask Smart Stack with both in your stack to get an answer grounded in their current docs.
Can Smart Stack answer questions about both Express and Fastify?
Yes — add both to your stack and Smart Stack searches the official docs for each, which is especially useful when you're migrating from one to the other or weighing a decision.