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

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

codex mcp add js-reverse -- npx js-reverse-mcp

git clone https://github.com/zhizhuodemao/js-reverse-mcp.git
cd js-reverse-mcp
npm install
npm run build

{
  "mcpServers": {
    "js-reverse": {
      "command": "node",
      "args": ["/path/to/js-reverse-mcp/build/src/index.js"]
    }
  }
}

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

npx cloakbrowser install

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

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

// User: "Debug the encryption on example.com"

// Step 1: Open target page
await use_mcp_tool("js-reverse", "new_page", {
  url: "https://example.com"
});

// Step 2: Find encryption functions
const searchResults = await use_mcp_tool("js-reverse", "search_in_sources", {
  query: "encrypt|crypto|AES|cipher",
  isRegex: true
});

// Step 3: Set breakpoint on encryption function
await use_mcp_tool("js-reverse", "set_breakpoint_on_text", {
  searchText: "function encrypt(data)",
  scriptUrl: searchResults[0].url
});

// Step 4: Trigger action (user does this in browser or via evaluate_script)
// ... breakpoint hits ...

// Step 5: Inspect paused state
const pausedInfo = await use_mcp_tool("js-reverse", "get_paused_info", {});
// Returns: call stack, scope variables, current location

// Step 6: Evaluate in breakpoint context
const params = await use_mcp_tool("js-reverse", "evaluate_script", {
  expression: "data",
  returnByValue: true
});

// Step 7: Step through execution
await use_mcp_tool("js-reverse", "step", {
  action: "into"  // or "over", "out"
});

// User: "Find where this API request is initiated"

// Step 1: List network requests
const requests = await use_mcp_tool("js-reverse", "list_network_requests", {});

// Step 2: Find target request
const apiRequest = requests.find(r => r.url.includes("/api/user"));

// Step 3: Get JavaScript call stack
const initiator = await use_mcp_tool("js-reverse", "get_request_initiator", {
  reqid: apiRequest.reqid
});
// Returns: full JS stack trace from initiation point

// Step 4: Set breakpoint at initiation
await use_mcp_tool("js-reverse", "set_breakpoint_on_text", {
  searchText: initiator.callFrames[0].functionName,
  scriptUrl: initiator.callFrames[0].url
});

// User: "Break on all requests to /api/encrypt"

// Set XHR breakpoint with URL pattern
await use_mcp_tool("js-reverse", "break_on_xhr", {
  urlPattern: "*/api/encrypt*"
});

// Execution will pause before matching XHR/fetch
// Then inspect request body, headers, call stack
const pausedInfo = await use_mcp_tool("js-reverse", "get_paused_info", {});

// Evaluate request payload
const payload = await use_mcp_tool("js-reverse", "evaluate_script", {
  expression: "arguments[0]",  // xhr.send() argument
  returnByValue: true
});

// User: "Analyze the WebSocket messages for this trading site"

// Step 1: List WebSocket connections
const wsData = await use_mcp_tool("js-reverse", "get_websocket_messages", {
  action: "list"
});

// Step 2: Analyze message patterns
const analysis = await use_mcp_tool("js-reverse", "get_websocket_messages", {
  action: "analyze",
  wsid: wsData.connections[0].wsid
});
// Returns: message type distribution, size stats, timing patterns

// Step 3: Inspect specific message
const message = await use_mcp_tool("js-reverse", "get_websocket_messages", {
  action: "get",
  wsid: wsData.connections[0].wsid,
  msgid: "msg_123"
});
// Returns: full payload, timestamp, direction (sent/received)

// User: "Set breakpoint on the obfuscated validation function"

// Step 1: Search for function signature in minified code
const results = await use_mcp_tool("js-reverse", "search_in_sources", {
  query: "validate.*password",
  isRegex: true
});

// Step 2: Get context around match
const source = await use_mcp_tool("js-reverse", "get_script_source", {
  scriptId: results[0].scriptId,
  startOffset: results[0].match.offset - 200,
  endOffset: results[0].match.offset + 200
});

// Step 3: Set breakpoint by text match (works in minified code)
await use_mcp_tool("js-reverse", "set_breakpoint_on_text", {
  searchText: results[0].match.line.trim(),
  scriptUrl: results[0].url,
  condition: "password.length > 0"  // optional conditional breakpoint
});

// After hitting breakpoint, inspect all accessible variables

const pausedInfo = await use_mcp_tool("js-reverse", "get_paused_info", {});

// pausedInfo.scopeChain contains:
// - local variables
// - closure variables
// - global scope

// Evaluate complex expressions in current scope
const result = await use_mcp_tool("js-reverse", "evaluate_script", {
  expression: "Object.keys(this).filter(k => k.startsWith('_'))",
  callFrameId: pausedInfo.callFrames[0].callFrameId,
  returnByValue: true
});

// User: "Save this 5MB minified bundle for analysis"

const scripts = await use_mcp_tool("js-reverse", "list_scripts", {});
const targetScript = scripts.find(s => s.url.includes("bundle.min.js"));

// Save to local file (more reliable than get_script_source for large files)
await use_mcp_tool("js-reverse", "save_script_source", {
  scriptId: targetScript.scriptId,
  outputPath: "/tmp/bundle.min.js"
});

// Now analyze with external tools or search within it
const matches = await use_mcp_tool("js-reverse", "search_in_sources", {
  query: "apiKey.*=.*['\"]([^'\"]+)['\"]",
  isRegex: true,
  scriptId: targetScript.scriptId
});

// User: "Debug login flow across multiple redirects"

// Step 1: List all open pages
const pages = await use_mcp_tool("js-reverse", "select_page", {});

// Step 2: Switch to login page
await use_mcp_tool("js-reverse", "select_page", {
  index: 0
});

// Step 3: Set breakpoint on form submit
await use_mcp_tool("js-reverse", "set_breakpoint_on_text", {
  searchText: "submitLogin"
});

// Step 4: After redirect, switch to new page
const updatedPages = await use_mcp_tool("js-reverse", "select_page", {});
await use_mcp_tool("js-reverse", "select_page", {
  index: updatedPages.length - 1
});

// Step 5: Continue debugging in new context
const scripts = await use_mcp_tool("js-reverse", "list_scripts", {});

"args": ["js-reverse-mcp", "--isolated"]

npx cloakbrowser install

"args": ["js-reverse-mcp", "--cloak"]

rm -rf ~/.cache/chrome-devtools-mcp/chrome-profile

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