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What is Express.js?

Q: What is Express.js?

Short answer: Express.js is a fast, minimal, and flexible Node.js web framework. It simplifies building web applications and APIs by handling routing, middleware, requests, responses, and more. ✅ It’s like jQuery for the backend — removes the boilerplate. Real-world example (ShopNest) Express middleware authenticates JWT, then the /orders route handler creates the order. Say this in the interview Define — one clear sentence (the short answer above). Example — relate it to a project like ShopNest or your real work. Trade-off — when you would not use it.

Short answer: Express.js is a fast, minimal, and flexible Node.js web framework. It simplifies building web applications and APIs by handling routing, middleware, requests, responses, and more. ✅ It’s like jQuery for the backend — removes the boilerplate.

Real-world example (ShopNest)

Express middleware authenticates JWT, then the /orders route handler creates the order.

Say this in the interview

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

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