What are Proxies in JavaScript?

Short answer: Proxy allows you to intercept and redefine fundamental operations on objects.

Example code

const user = { name: "Alice" }; const proxy = new Proxy(user, { get: (target, prop) => `${prop} -> ${target[prop]}` }); console.log(proxy.name); // name -> Alice ✅ Used in data validation, reactive frameworks (like Vue.js).

Real-world example (ShopNest)

ShopNest’s browser cart uses modern JavaScript: fetch APIs with async/await, modules, and clear error handling.

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.