JS Reverse MCP

What it does

JS Reverse MCP transforms a browser into an analysis workbench for AI agents. It allows LLMs to perform continuous debugging, locate obfuscated scripts, set breakpoints, and analyze network traffic to reverse engineer JavaScript behavior in real-time.

Tools

• select_page: Switch between open browser tabs.
• new_page: Open a new URL for analysis.
• list_scripts: Inventory all loaded JS files on a page.
• get_script_source: Extract specific source code fragments.
• save_script_source: Export full scripts to local files for deep analysis.
• set_breakpoint_on_text: Automatically set breakpoints in compressed code.
• get_paused_info: Inspect call stacks and scope variables during pauses.
• list_network_requests: Analyze XHR/Fetch and WebSocket traffic.
• evaluate_script: Execute JS in page or breakpoint contexts.
• clear_site_data: Reset cookies and cache to reproduce risk-control flows.

Installation

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "js-reverse": {
      "command": "npx",
      "args": ["js-reverse-mcp"]
    }
  }
}

Supported hosts

Confirmed for Claude Desktop, Cursor, and VS Code Copilot.