browser-devtools-mcp

# /run-js Execute JavaScript code in the browser. ## Usage ``` /run-js <code> ``` ## Description Executes JavaScript code in the browser context. Has access to the page's DOM, window object, and all page APIs. ## Arguments - `code` (required): JavaScript code to execute ## Examples ``` /run-js document.title /run-js window.location.href /run-js document.querySelectorAll('a').length /run-js localStorage.getItem('token') /run-js JSON.stringify(window.performance.timing) ``` ## Advanced Examples Get all form data: ``` /run-js Object.fromEntries(new FormData(document.querySelector('form'))) ``` Check for specific element: ``` /run-js !!document.querySelector('.error-message') ``` ## Security Note Code runs with full page privileges. Be careful with untrusted inputs. ## MCP Tools Used - `run_js-in-browser` - Execute JavaScript in browser context