Find Real Bugs by Simply Reading JavaScript Files

Beginner’s Guide to Bug Hunting: How JavaScript Analysis Led Me to Multiple Hidden Vulnerabilities

Monika sharma

3 min read

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19 hours ago

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Introduction

When I started bug hunting I honestly had no idea that JavaScript (JS) files could reveal so many secrets.
I used to think JS files were only there to run buttons, animations and front-end logic.
But everything changed the day I found my first real vulnerability just by reading a JavaScript file.

That moment taught me something important:

JavaScript files are like a developer’s open diary and sometimes that diary leaks sensitive things.

In this article, I’m going to share exactly how I used only JS file analysis to find hidden endpoints, sensitive information, and real bugs all in a simple way that even beginners can follow.

1. How I Accidentally Started Reading JavaScript Files

But one day, during recon, I found a URL like this:

/static/js/app.min.js

Out of curiosity I opened it.
And suddenly, I noticed things that were never visible on the website:

/api/v1/admin/login…