What is Middleware? #3625
What is Middleware?
#3625
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What is Middleware? |
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Answered by
NadeeshaMedagama
Jun 28, 2026
Replies: 1 comment
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Middleware is software that runs between the incoming request and the final route handler. It can: Authenticate users app.use(authMiddleware); app.get("/users", controller); ↓ Middleware ↓ Authentication ↓ Validation ↓ Route Handler ↓ Response |
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Answer selected by
janedoe2026
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Middleware is software that runs between the incoming request and the final route handler.
It can:
Authenticate users
Validate input
Log requests
Handle errors
Enable CORS
Parse JSON
Express Example
app.use(express.json());
app.use(authMiddleware);
app.get("/users", controller);
Request Flow
Client
↓
Middleware
↓
Authentication
↓
Validation
↓
Route Handler
↓
Response
Benefits
Reusable code
Cleaner controllers
Easier maintenance