Run Hono On Node.js 22

server.js

import { Hono } from "hono";
import { compress } from "hono/compress";
import { streamSSE } from "hono/streaming";
import { createServer } from "node:http";

const app = new Hono();

app.get("/", compress({ encoding: "gzip" }), (c) => {
  return c.html("<h1>Hello, World!</h1>");
});

app.get("/json", (c) => {
  return c.json({ hello: "world" });
});

app.get("/sse", (c) => {
  let size = 10;
  return streamSSE(c, async (stream) => {
    while (size > 0) {
      size -= 1;
      await new Promise((resolve) => setTimeout(resolve, 500));
      stream.writeSSE({ data: `Hello, World! ${size}` });
    }
  });
});

function convertReqToStandardRequest(req) {
  const host = req.headers["host"];
  const url = req.url;
  const protocol = req.connection.encrypted ? "https" : "http";
  const fullUrl = host ? `${protocol}://${host}${url}` : url;
  const method = req.method;
  const headers = {};
  for (const [key, value] of Object.entries(req.headers)) {
    headers[key.toLowerCase()] = value;
  }
  let body;
  if (method !== "GET" && method !== "HEAD") {
    if (req.headers["content-type"]?.includes("json")) {
      try {
        body = JSON.parse(req.body);
      } catch (error) {
        console.error("Error parsing JSON body:", error);
        body = null;
      }
    } else {
      body = req.rawBody || "";
    }
  }
  return new Request(fullUrl, { method, headers: new Headers(headers), body });
}

const server = createServer(async (req, res) => {
  const response = await app.fetch(convertReqToStandardRequest(req), {}, {});
  for (const [key, value] of response.headers) {
    res.setHeader(key, value);
  }
  res.statusCode = response.status;
  res.statusMessage = response.statusText;
  const body = response.body?.getReader();
  while (!!body) {
    const { done, value } = await body.read();
    if (done) {
      break;
    }
    res.write(value);
  }
  res.end();
});

server.listen(3000, () => {
  console.log("Server running at http://localhost:3000/");
});