Last Updated: November 21, 2025
Middleware Order
| Type | Placement |
|---|---|
Logger
|
Early |
Auth
|
Before secured routes |
Router
|
Mount after globals |
Error handler
|
Last |
Commands
app.use(express.json())
Parse JSON
app.use('/api', apiRouter)
Mount router
app.use((err, req, res, next) => {})
Catch errors
Advice
Keep middleware single responsibility, avoid async leaks, and call `next(err)` for errors.
💡 Pro Tip:
Place error handlers last and target middleware to specific routes when possible.