Arjun
Arjun finds hidden HTTP parameters on web endpoints by testing wordlists efficiently.
Legal & ethical use. Use this tool only on systems, networks and data that you own or have explicit written permission to test. Unauthorised access or scanning can break computer-misuse laws (for example Pakistan's Prevention of Electronic Crimes Act, 2016, and equivalents elsewhere). Practise in your own lab or in authorised environments such as CTFs.
What it is used for
- Discover undocumented parameters in your own API
- Prepare input for further testing
Key features
- Fast batching
- GET/POST/JSON support
- Wordlist based
Installation
pip install arjun
Beginner usage guide
Point it at an endpoint of your own lab application.
Example commands
Run these only against your own lab or authorised targets. Placeholder addresses such as 192.0.2.x are documentation ranges.
Scan a URL
arjun -u http://localhost:3000/rest/products/search-u sets the endpoint to test.
References
Source verification
Last reviewed: 2026-10-27
Links checked over HTTP: 2026-10-27 07:51 UTC — official: 200, docs: 200, repo: 200
Commands were written from the official documentation and have not been executed on this site; test them in your lab.