Super Lightweight Proxy for Hono

Proxy-Endpoint-Hono.md

Nice Little Hono Proxy Endpoint

This is perfect if you want to migrate from Express.JS (or any other framework) to Hono without Downtime:

Just include this Proxy Server Endpoint at the End of your Hono Endpoints (usually index.ts):

// PROXY SERVER ENDPOINT
app.all('/*', async (c) => {
  const legacyBackend = 'http://localhost:3000'; // proxy target
  const newBackend = 'http://localhost:8787'; // proxy server location
  try {
    // Forward request body for POST/PUT/PATCH requests
    const body = c.req.method !== 'GET' && c.req.method !== 'HEAD'
      ? await c.req.text()
      : undefined;

    const response = await axios.request({
      url: c.req.url.replace(legacyBackend, newBackend),
      method: c.req.method,
      headers: c.req.header(),
      data: body,
      responseType: 'arraybuffer',
      validateStatus: () => true // Don't throw on HTTP error status codes
    });

    const resBody = response.data;

    return new Response(resBody, {
      status: response.status,
      statusText: response.statusText,
      headers: response.headers as HeadersInit // seems mostly compatible
    });
  } catch (error) {
    // Fallback error handling
    return c.json({ error: 'Proxy error' }, 500);
  }
});

Tags: ['How to migrate from Express to Hono', 'Hono Proxy Server', 'Hono proxy middleware']