Streaming & SSE in Svelte

From the SvelteKit cheat sheet · API Routes · verified Jul 2026

Streaming & SSE

Server-sent events and streaming responses

javascript
// Streaming response
export async function GET() {
  const stream = new ReadableStream({
    start(controller) {
      controller.enqueue('Hello');
      controller.close();
    }
  });
  
  return new Response(stream);
}
📡 Server-sent events for real-time updates
🌊 Streaming responses for large data
📦 NDJSON for streaming JSON data
⚡ Efficient memory usage for large files

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