What are Server-Sent Events?

SSE is a one-way HTTP stream where the server pushes text/event-stream messages to the browser over a long-lived connection.

SSE is simpler for server→client feeds over HTTP. WebSockets are bidirectional and better for interactive apps.

Why do events not appear?

Check CORS headers, correct Content-Type (text/event-stream), and that the server keeps the connection open.

Is my data uploaded when I use SSE Client?

No. SSE Client runs entirely in your browser. Your input never leaves your device.

SSE Client

Network Live

Subscribe to Server-Sent Events streams and view live messages.

About this tool

SSE Client — Subscribe to Server-Sent Events streams and view live messages. Free, fast and private. Runs entirely in your browser at Quick Calci Tools.

Who uses the SSE Client?

Common scenarios and audiences for this tool.

Frontend developers

Use the tool for frontend developers workflows without leaving the browser.

Streaming dashboards

Speed up streaming dashboards tasks with instant local processing.

Notification systems

Handle notification systems checks during development or review.

Live feeds

Support live feeds with a private, signup-free utility.

DevOps

Ideal for devops when you need quick, repeatable results.

Frequently asked questions

Everything you need to know about the SSE Client.