Server-Sent Events (SSE) Playground

Tag: Server-Sent Events (SSE) Playground

2+ tools

New

SSE (EventSource) Tester - Online Stream Listener

Connect to an SSE endpoint and display events in real time. Inspect event types and data. Handy for frontend devs.

Developer Tools EventSource SSE stream test

New

EventSource Polyfill Demo - Online See SSE with Custom Headers

Demonstrate how to add custom headers and POST‑like functionality to EventSource using a polyfill. Code and example.

Developer Tools demo EventSource polyfill SSE