JS Reverse MCP

JS Reverse MCP is an MCP server for JavaScript reverse engineering and debugging in Chrome with AI agents.

JS Reverse MCP is an AI-first Model Context Protocol server that enables AI coding assistants like Claude, Cursor, and Copilot to debug, locate, save, and review JavaScript behavior in web pages like an analyst. It organizes scripts, breakpoints, network requests, WebSockets, browser state, and local file input and output into tools designed for agent decision-making. The server features a dedicated Patchright fork for protocol-level stealth and an optional CloakBrowser source-level fingerprint mode for heavily protected sites. It is intended for developers performing script retrieval, breakpoint analysis, network tracking, and code logic understanding. The system requires Node.js version 20.19 or newer and stable Google Chrome.

JS Reverse MCP at a glance

Best for: Software engineer
Runs on: CLI, Node.js, Chrome, self-hosted, open source
Pricing: Free
Released: November 2025
Category: AI coding tool
Website: github.com/zhizhuodemao/js-reverse-mcp

Key features

List and search all loaded JavaScript scripts
Set breakpoints using text search or XHR patterns
Inspect call frames, scope variables, and step execution
List network requests and export headers, bodies, or query parameters
Analyze WebSocket connections and message patterns
Clear site cookies, cache, and storage to reproduce flows
Execute JavaScript in page or breakpoint contexts

Use it for

Debug and reverse engineer complex JavaScript in web applications
Analyze network traffic and WebSocket messages using AI assistants
Bypass anti-bot protections and anti-scraping checks
Automate script source extraction and local file export

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