Serverless and Edge Computing 2026: Building Globally Distributed Applications

// Cloudflare Worker with KV storage
import { Hono } from 'hono';

type Bindings = {
  CACHE: KVNamespace;
  DB: D1Database;
};

const app = new Hono<{ Bindings: Bindings }>();

app.get('/api/products/:id', async (c) => {
  const id = c.req.param('id');
  
  // Check edge cache
  const cached = await c.env.CACHE.get(`product:${id}`);
  if (cached) {
    return c.json(JSON.parse(cached));
  }
  
  // Query D1 database at edge
  const product = await c.env.DB
    .prepare('SELECT * FROM products WHERE id = ?')
    .bind(id)
    .first();
  
  if (!product) {
    return c.json({ error: 'Not found' }, 404);
  }
  
  // Cache at edge
  await c.env.CACHE.put(`product:${id}`, JSON.stringify(product), {
    expirationTtl: 3600,
  });
  
  return c.json(product);
});

export default app;

// Vercel Edge Function with geolocation
import { geolocation } from '@vercel/functions';

export const config = { runtime: 'edge' };

export default function handler(request: Request) {
  const geo = geolocation(request);
  
  // Route to nearest region
  const region = geo.country === 'US' ? 'us' : 'eu';
  
  return Response.json({
    message: `Hello from ${geo.city}, ${geo.country}`,
    region,
    latency: 'Served from edge in < 50ms',
  });
}