Tool Notes: jsfinder

jsfinder sits in the Links lane of bug bounty tooling (Recon). This note is a SapiensHack field card—not a dump of flags or exploit recipes.

In practice, teams reach for jsfinder when they need something that a tool that scans web pages to find JavaScript file URLs linked in the HTML source code.

Where it fits

Use it when your authorized scope needs links work and you already know the target boundaries.

Pair it with notes and screenshots so findings stay reproducible for reports—not just terminal noise.

• Prefer lab or explicitly in-scope hosts before any wide sweep

• Keep rate limits polite; noisy scans get programs upset and findings ignored

• Record exact version/commit when a finding depends on tool behavior

Tester habits

Read the upstream README for install and current flags—CLIs change faster than blog posts.

If the tool can touch production traffic, treat it like a change window: confirm scope, accounts, and out-of-bounds rules first.

Upstream

Project link: https://github.com/kacakb/jsfinder

Catalog inspiration: https://github.com/vavkamil/awesome-bugbounty-tools (we write our own guidance; go upstream for the tool itself).

Only run jsfinder against systems you’re written-up to test. SapiensHack publishes methodology for authorized work.

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Worth reading next

• Bug Bounty Tools Directory

• Start Here: SapiensHack Learning Path

• Tools & Techniques: Burp Suite Basics