What is Test-Driven Development (TDD) and how do you apply it to Node.js?

Short answer: Write tests before code, then develop just enough to pass tests. Use frameworks like Mocha or Jest.

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.