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7/6/2026
Streaming Responses in Next.js App Router — Server-Sent Events and ReadableStream

Streaming Responses in Next.js App Router — Server-Sent Events and ReadableStream

Short summary

Long-running requests create frozen UIs that erode user trust, but incremental delivery fixes this without optimizing the underlying operation. Server-Sent Events stream data from the server as soon as it's available, keeping users informed instead of staring at blank spinners. Next.js App Router's ReadableStream API makes implementing SSE straightforward, turning hidden backend processing into visible, trust-building progress that works reliably in serverless environments.

  • •Long-running requests create frozen UIs and erode user trust
  • •Server-Sent Events deliver incremental responses without complexity
  • •Next.js ReadableStream provides simple, serverless-friendly implementation

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