SSE Tester

Test your Server-Sent Events endpoints with this interactive tool. Enter your endpoint URL and request body below to start streaming responses.

POST

About SSE Tester

SSE Tester is a free, open-source tool designed to help developers test and debug Server-Sent Events (SSE) endpoints. Perfect for testing streaming APIs like ChatGPT-style implementations, real-time notifications, and live data feeds.

Key Features:

  • Test any SSE endpoint with custom URLs and request bodies
  • Real-time response streaming with markdown support
  • JSON request body editor
  • Clean, simple UI

Common Use Cases:

  • Testing AI streaming responses
  • Debugging SSE implementations
  • Validating real-time data streams
  • Monitoring event sources
  • Source code available on GitHub