Hono•8mo ago

Streaming not working with Hono Node Server #4154

Streaming doesn't work. it send the response once it's done processing fully. i tried with the bun dev (not bun server) but somehow it seemed working, really strange.

We can run this repo locally: https://github.com/nilooy/my-better-t-app-2 to reproduce it.
the suspected code is here: https://github.com/nilooy/my-better-t-app-2/blob/main/apps/server/src/index.ts#L42-L60

app.post("/ai", async (c) => {
  const body = await c.req.json();
  const messages = body.messages || [];

  const result = streamText({
    model: openai("o3-mini"),
    messages,
  });

  for await (const chunk of result.toDataStream()) {
    console.log(chunk);
  }

  c.header("X-Vercel-AI-Data-Stream", "v1");
  c.header("Content-Type", "text/plain; charset=utf-8");

  return stream(c, (stream) => stream.pipe(result.toDataStream()));
});

app.post("/ai", async (c) => {
  const body = await c.req.json();
  const messages = body.messages || [];

  const result = streamText({
    model: openai("o3-mini"),
    messages,
  });

  for await (const chunk of result.toDataStream()) {
    console.log(chunk);
  }

  c.header("X-Vercel-AI-Data-Stream", "v1");
  c.header("Content-Type", "text/plain; charset=utf-8");

  return stream(c, (stream) => stream.pipe(result.toDataStream()));
});

app.post("/ai", async (c) => {
  const body = await c.req.json();
  const messages = body.messages || [];

  const result = streamText({
    model: openai("o3-mini"),
    messages,
  });

  for await (const chunk of result.toDataStream()) {
    console.log(chunk);
  }

  c.header("X-Vercel-AI-Data-Stream", "v1");
  c.header("Content-Type", "text/plain; charset=utf-8");

  return stream(c, (stream) => stream.pipe(result.toDataStream()));
});

app.post("/ai", async (c) => {
  const body = await c.req.json();
  const messages = body.messages || [];

  const result = streamText({
    model: openai("o3-mini"),
    messages,
  });

  for await (const chunk of result.toDataStream()) {
    console.log(chunk);
  }

  c.header("X-Vercel-AI-Data-Stream", "v1");
  c.header("Content-Type", "text/plain; charset=utf-8");

  return stream(c, (stream) => stream.pipe(result.toDataStream()));
});

VIDEO: https://github.com/user-attachments/assets/c40d44c1-0cac-45f1-983b-0e9fc95cb018
GITHUB ISSUE**: https://github.com/honojs/hono/issues/4154

What version of Hono are you using?
^4.7.10
What runtime/platform is your app running on? (with version if possible)
Node.js

GitHub

GitHub - nilooy/my-better-t-app-2

Contribute to nilooy/my-better-t-app-2 development by creating an account on GitHub.

GitHub

Streaming not working with Hono Node Server · Issue #4154 · honoj...

What version of Hono are you using? ^4.7.10 What runtime/platform is your app running on? (with version if possible) Node.js What steps can reproduce the bug? Streaming doesn't work. it send th...

GitHub

my-better-t-app-2/apps/server/src/index.ts at main · nilooy/my-bet...

Contribute to nilooy/my-better-t-app-2 development by creating an account on GitHub.

Streaming not working with Hono Node Server #4154

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