Js Analyzer

Q: What is a Claude Code skill and how does the Js Analyzer skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Js Analyzer is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Security · Sub-category: web-security · Last updated: 2026-06-18

lang:javascript

Full JavaScript analysis methodology for pentesting and bug bounty — JS file discovery, secret extraction, endpoint mapping, DOM XSS, prototype pollution, postMessage abuse, client-side logic flaws, source map extraction, and hardcoded credential hunting. Use when analyzing a target's JavaScript: hunting endpoints or secrets in bundles, or testing client-side vulns.

From the source SKILL.md

JS files are often the most information-rich attack surface in a web application. A thorough JS review routinely yields: hidden API endpoints, hardcoded secrets, client-side authorization logic to bypass, insecure postMessage handlers, and vulnerable third-party libraries.

What this skill does

Js Analyzer is a community-contributed Claude Code skill in the web-security sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/js-analyzer/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when analyzing a target's JavaScript: hunting endpoints or secrets in bundles, or testing client-side vulns.

Who uses this skill

The Js Analyzer Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 119,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/js-analyzer
curl -L https://claudskills.com/skills/js-analyzer/SKILL.md \
  -o ~/.claude/skills/js-analyzer/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/js-analyzer/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/js-analyzer/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\js-analyzer\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Js Analyzer Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/js-analyzer/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Js Analyzer skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Js Analyzer skill?

Use Js Analyzer when your Claude Code task falls under the Security category — specifically in the web security area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Js Analyzer" or describe the task and let Claude pick). Browse related skills at /category/security/.

What is a Claude Code skill and how does the Js Analyzer skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Js Analyzer is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/Rifteo/skills/blob/HEAD/js-analyzer/SKILL.md
License: MIT
Author: Rifteo

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

Rifteo. (2026). Js Analyzer [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/js-analyzer/

BibTeX

@misc{js-analyzer-2026,
  author    = {Rifteo},
  title     = {Js Analyzer [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/js-analyzer/}
}

Embed this skill

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Badge

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