EventSource vs Async Generator - What to Use for LLM Streaming?

When it comes to consuming streaming responses in the browser, especially from Server-Sent Events (SSE), two main approaches emerge: Using the native EventSource API Using fetch with an async generator to manually parse the stream Let’s break down the differences and when to use each.

Apr 29, 2025 - 18:09
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EventSource vs Async Generator - What to Use for LLM Streaming?

When it comes to consuming streaming responses in the browser, especially from Server-Sent Events (SSE), two main approaches emerge:

  • Using the native EventSource API
  • Using fetch with an async generator to manually parse the stream

Let’s break down the differences and when to use each.