Node Summary

# Node.js summary

You can now:

- Read the event loop and choose async / streams / workers correctly
- Write idiomatic ESM TypeScript with strict mode
- Build small HTTP services with Fastify, Hono, or the native server
- Validate env + input with Zod
- Stream files with pipeline + backpressure
- Log JSON to stdout with pino; trace with OpenTelemetry
- Test with Vitest, MSW, and Testcontainers
- Containerise with a small multi-stage Dockerfile
- Deploy on Fly, Render, Vercel, or AWS Fargate

# Your next step - a Hono service

// server.ts
import { Hono } from 'hono';
import { z } from 'zod';
import { logger } from 'hono/logger';

const app = new Hono();
app.use('*', logger());

const Echo = z.object({ message: z.string().min(1) });

app.get('/healthz', (c) => c.text('ok'));

app.post('/echo', async (c) => {
  const body = Echo.safeParse(await c.req.json());
  if (!body.success) return c.json(body.error.flatten(), 400);
  return c.json({ echoed: body.data.message, at: Date.now() });
});

export default { port: 3000, fetch: app.fetch };

console.log('Next: a framework like NestJS or build a real API.');