Let's be honest — JavaScript Proxies don’t get nearly enough love. But if you’re writing Node.js code and ever thought, “I wish I could intercept that object access or tweak what this function does without touching the original code,” then proxies are your secret weapon.

Here’s a practical, real-world breakdown — with minimal fluff and maximal clarity.

What is a Proxy, Really?

At its core, a proxy is a wrapper around an object or function that intercepts operations — like property reads, writes, or function calls.

That handler object? It defines traps, which are functions you write to handle the intercepted behavior. If there’s no trap for an operation, the proxy just passes through to the original object.