JavaScript Enumeration for Bug Bounties: Expose Hidden Endpoints & Secrets Like a Pro!

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JavaScript files are an absolute goldmine for bug bounty hunters, often revealing hidden API endpoints, sensitive keys, and admin paths. If you’re skipping JS enumeration, you’re missing out on high-value targets and serious bounties! 💰

Hi, I’m Akash (myselfakash20), This guide walks you through cutting-edge techniques, automation, and chaining multiple tools to extract hidden data from JavaScript files efficiently. Whether you’re a beginner looking to get started or an advanced hunter optimizing your recon workflow, this guide is for you!

Read this You’ll definitely find out something, if you have any question, then ask me in comment section. Thank You

1️. Finding JavaScript Files on a Target 🎯

Automated Methods (Using CLI Tools)

# Get all JavaScript files from a target using gau (GetAllURLs)
gau target.com | grep "\.js" | tee js_files.txt

# Extract JS file URLs from Wayback Machine
waybackurls target.com | grep "\.js" | tee js_wayback.txt

# Use katana for fast crawling
katana -u https://target.com -jc -silent | tee js_katana.txt

# Combine all JS sources
echo target.com | subfinder | httpx -silent | gau | grep "\.js" | anew all_js.txt

# Extract JS links from robots.txt
curl -s https://target.com/robots.txt | grep "\.js" | awk '{print $NF}' | tee js_robots.txt

Manual Methods :

1. Inspect the Page Source (Ctrl + U) → Look for <script> tags.
2. Use the Network Tab (F12 → Sources) → Check JS files loading from external sources.
3. Use Burp Suite Spidering to find hidden JS files.

2️. Extracting Endpoints & API Keys from JavaScript

Using LinkFinder to Extract Endpoints

cat js_files.txt | xargs -I{} python3 ~/tools/LinkFinder/linkfinder.py -i {} -o li | tee endpoints.txt

Using SecretFinder to Find API Keys & Secrets

cat js_files.txt | xargs -I{} python3 ~/tools/SecretFinder/SecretFinder.py -i {} -o cli | tee secrets.txt