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JSFScan: Automation for JavaScript Recon in Bug Bounty

Vijay Kumar Gupta
5 min readFeb 19, 2025

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Introduction

JavaScript files often contain valuable information that attackers and security researchers can leverage to identify vulnerabilities. Whether it’s API keys, sensitive endpoints, or hidden functionalities, JavaScript can reveal a lot about an application. Bug bounty hunters frequently analyze JavaScript files to find security loopholes, and automation plays a crucial role in making this process more efficient.

JSFScan is a powerful tool designed to automate JavaScript reconnaissance. This blog post will take a deep dive into how JSFScan works, why it is essential for bug bounty hunters, and how you can use it to enhance your recon process.

Why JavaScript Recon Matters in Bug Bounty

JavaScript files are often publicly accessible and can expose sensitive information unintentionally. Here’s why JavaScript recon is a crucial step in bug bounty hunting:

  1. Exposure of Sensitive Data — API keys, tokens, and credentials might be left behind in JavaScript files due to poor security practices.
  2. Discovery of Hidden Endpoints — JavaScript often references backend APIs that may not be documented elsewhere.
  3. Identifying Unprotected Parameters — Developers sometimes…

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Vijay Kumar Gupta
Vijay Kumar Gupta

Written by Vijay Kumar Gupta

Vijay Gupta is an inspiring public speaker and social entrepreneur who has dedicated his life to bringing about positive change and empowering communities.

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