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ElysiaJS vs Fastify
Trust Score comparison · March 2026
Signal Comparison
180k / wknpm downloads3M / wk
140 commitsCommits (90d)120 commits
11k ★GitHub stars33k ★
100 q'sStack Overflow5k q's
GrowingCommunityHigh
ElysiaJSFastify
Key Differences
| Factor | ElysiaJS | Fastify |
|---|---|---|
| License | MIT | MIT |
| Language | TypeScript | TypeScript |
| Hosted | Self-hosted | Self-hosted |
| Free tier | — | — |
| Open Source | ✓ Yes | ✓ Yes |
| TypeScript | ✓ | ✓ |
Pick ElysiaJS if…
- Building APIs on Bun where you want tRPC-style type safety with a REST interface
- Teams already running Bun who want a native, opinionated framework
- Microservices needing maximum throughput on Bun runtime
Pick Fastify if…
- Performance-critical Node.js APIs where Express is a bottleneck
- JSON-heavy APIs that benefit from schema-validated serialization
- Teams who want Express familiarity with far better performance
Side-by-side Quick Start
ElysiaJS
import { Elysia } from 'elysia';
const app = new Elysia()
.get('/', () => 'Hello Elysia!')
.post('/user', ({ body }) => body, {
body: t.Object({ name: t.String() }),
})
.listen(3000);Fastify
import Fastify from 'fastify';
const app = Fastify({ logger: true });
app.get('/', async (request, reply) => {
return { hello: 'world' };
});
await app.listen({ port: 3000 });Community Verdict
Based on upvoted notes🏆
Fastify wins this comparison
Trust Score 83 vs 74 · 9-point difference
Fastify leads on Trust Score with stronger signal data across downloads and community health. That said, the other tool is worth considering if your use case matches its specific strengths above.