SSE Tap

Read every Server-Sent Event your page receives, in a separate tab.

A Chrome extension built against three things the DevTools EventStream tab does badly.

Payloads are not truncated

Messages are captured whole up to 1MB, rendered in full, expandable and copyable one at a time — roughly 125× what the EventStream tab will show you.

Events that fire before you look are already recorded

Collection starts at document_start in the background, with nothing open. The events your app emits during startup are waiting for you when you go looking.

A refresh does not wipe the log

The buffer carries across reloads of the watched page, and each reload is marked inline, so you can read before and after as one timeline — in a normal Chrome tab you can leave open on another monitor.

The SSE Tap viewer showing a timeline of captured events with an expanded JSON payload

Install

Grab the source from GitHub, then chrome://extensions → Developer mode → Load unpacked → pick the src folder. Needs Chrome 111 or newer.

Privacy

Nothing leaves your browser. Nothing is written to disk. See the privacy policy.