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Jsmon is a powerful tool designed to help you discover live JavaScript (JS) files by scanning domains. This is particularly useful for security researchers, bug bounty hunters, and web developers who need to analyze JS files for vulnerabilities, exposed endpoints, or sensitive data leaks.
GitHub Repository: https://github.com/robre/jsmon
You Should Know:
Installation & Setup
To get started with Jsmon, follow these steps:
1. Clone the Repository:
git clone https://github.com/robre/jsmon.git cd jsmon
2. Install Dependencies:
pip install -r requirements.txt
3. Run Jsmon:
python3 jsmon.py -d example.com
Key Features
- Domain Scanning: Discovers all live JS files associated with a domain.
- File Analysis: Extracts endpoints, secrets, and API keys from JS files.
- Custom Regex Support: Allows users to define custom patterns for sensitive data.
Practical Commands
- Scan a Single Domain:
python3 jsmon.py -d target.com
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Scan Multiple Domains (From File):
python3 jsmon.py -l domains.txt
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Save Output to a File:
python3 jsmon.py -d example.com -o results.json
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Use Custom Regex for Secrets:
python3 jsmon.py -d example.com --regex "(api_key|password)=['\"][^'\"]+"
Advanced Usage
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Combine with Other Tools (e.g., Waybackurls):
waybackurls example.com | grep ".js$" | python3 jsmon.py --stdin
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Parallel Scanning (Using GNU Parallel):
cat domains.txt | parallel -j 10 "python3 jsmon.py -d {}"
What Undercode Say
Jsmon is an essential tool for modern web reconnaissance, enabling security professionals to identify and analyze JavaScript files efficiently. By integrating it into your workflow, you can uncover hidden vulnerabilities, misconfigurations, and sensitive data exposures.
Additional Linux & Windows Commands for JS Analysis
- Extract URLs from JS Files (Linux):
grep -Eo "(http|https)://[a-zA-Z0-9./?=_%:-]*" file.js
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Search for API Keys in JS Files (Windows PowerShell):
Select-String -Path "*.js" -Pattern "api_key|secret|token"
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Monitor Live JS Files Continuously (Linux):
while true; do python3 jsmon.py -d example.com; sleep 3600; done
Expected Output:
A structured JSON or text file containing discovered JS files, extracted endpoints, and potential secrets, ready for further analysis.
This article provides a comprehensive guide to using Jsmon for JS file discovery and analysis, complete with practical commands and integration techniques.
References:
Reported By: Encodedguy Find – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
