Crosstalk — Frame & Socket Inspector

Observe iframe postMessage and Socket.IO/WebSocket traffic in one DevTools timeline.

Crosstalk is a Chrome DevTools extension that puts cross-frame messaging and real-time socket traffic on one unified timeline. ■ What it does • Capture postMessage between iframes and the parent window in real time • Decode Socket.IO / WebSocket frames into the same timeline • See source, direction, type, and payload of every message at a glance ■ Features • Unified timeline for postMessage + socket traffic • Hide noise, filter by type, and search • Auto-scroll, pause, and copy • postMessage inspection works instantly — no backend required ■ Privacy • Everything runs locally in your browser. • Captured data is never transmitted or stored remotely. • Only your settings (filters, etc.) are saved locally. Open source. A generic tool for any developer debugging frame communication.