Bug Hunting in JS Files: Tricks, Tools, and Real-World POCs

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💥 “This one JavaScript file changed everything…”

Yes, just one. A forgotten .js file led me to exposed API keys, hidden endpoints, and even a full Account Takeover vulnerability. And the wildest part? It was public — anyone could’ve found it.

90% of bug hunters skip JavaScript files because they think they’re boring or too complex. But that’s exactly where the gold is hiding. In this write-up, I’ll show you:

✅ My exact workflow to analyze JS files (with tools)

✅ Secret tricks most people don’t talk about

✅ Real-world bugs I found from just reading JavaScript

✅ How you can do this too — even if you’re a beginner

Let’s dive deep into the shadows of frontend code 👇

Created by Copilot

JS files often contain:

🗝️ API keys (yes, even secrets)