js-reverse-mcp

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A JavaScript reverse engineering MCP server that enables AI coding assistants (Claude, Cursor, Copilot) to debug and analyze JavaScript code in web pages.

Built on the Patchright anti-detection engine with multi-layered anti-bot bypass capabilities, allowing it to work on sites with bot detection such as Zhihu and Google.

• Anti-detection browser: Based on Patchright (Playwright anti-detection fork), 60+ stealth launch arguments, bypasses mainstream anti-bot systems
• Script analysis: List all loaded JS scripts, search code, get/save source code
• Breakpoint debugging: Set/remove breakpoints, conditional breakpoints, precise positioning in minified code
• Function tracing: Trace any function (including module-internal functions) via logpoints
• Execution control: Pause/resume execution, step debugging (over/into/out) with source context
• Runtime inspection: Evaluate expressions at breakpoints, inspect scope variables
• Network analysis: View request initiator call stacks, set XHR breakpoints, WebSocket message analysis
• Script injection: Inject scripts that run before page load for interception and instrumentation

• Node.js v20.19 or later
• Chrome stable

No installation required. Add to your MCP client configuration:

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

claude mcp add js-reverse npx js-reverse-mcp

Go to Cursor Settings -> MCP -> New MCP Server, and use the configuration above.

code --add-mcp '{"name":"js-reverse","command":"npx","args":["js-reverse-mcp"]}'

git clone https://github.com/nicecaesar/js-reverse-mcp.git
cd js-