What are status codes? Name commonly used ones.

Short answer: HTTP status codes indicate the result of a request: Code Meaning 200 OK 201 Created 400 Bad Request 401 Unauthorized 403 Forbidden 404 Not Found 500 Internal Server Error 📌 res.status(201).json({ message: 'User created successfully' }); HTTP status codes indicate the result of a request: Code Meaning 200 OK 201 Created… 400 Bad Request 401… Unauthorized 403 Forbidden 404 Not Found 500 Internal Server Error 📌

Example code

res.status(201).json({ message: 'User created successfully' }); HTTP status codes indicate the result of a request: Code Meaning 200 OK 201 Created 400 Bad Request 401 Unauthorized 403 Forbidden 404 Not Found 500 Internal Server Error 📌 Example: res.status(201).json({ message: 'User created successfully' }); HTTP status codes indicate the result of a request: Code Meaning 200 OK 201 Created… 400 Bad Request 401 Unauthorized 403 Forbidden 404 Not Found 500 Internal Server Error 📌 Example: res.status(201).json({ message: 'User created successfully' });

Real-world example (ShopNest)

A ShopNest BFF in Node.js aggregates catalog and price APIs for the React storefront.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.