Express → Elysia (Bun)
mediumElysia is built for Bun and gives end-to-end type safety with a Hono-like API. 10x+ throughput vs Express on the same hardware.
Estimated: 4-10h · 6 steps
Progress0%
Step 1: Install Bun and Elysia
curl -fsSL https://bun.sh/install | bash && bun add elysia
Step 2: Rewrite server entry
import { Elysia } from 'elysia'
new Elysia().get('/', () => 'ok').listen(3000)Step 3: Convert routes
app.get('/users/:id', (req,res) => ...) → .get('/users/:id', ({ params }) => ...). Type inference for params/query/body via schema.
Step 4: Replace middleware
express.json() built-in. cors → @elysiajs/cors. helmet → @elysiajs/helmet. multer → @elysiajs/multipart.
Step 5: Add validation
Replace zod/express-validator with Elysia's TypeBox-based schemas: t.Object({ ... }). Errors are returned automatically.
Step 6: Run tests
✓ All endpoints respond identically. Benchmark shows multi-x throughput improvement.