npm create cloudflare@latest -- my-next-app --framework=next

npm run dev      # Next.js dev server (fast reloads)
npm run preview  # Test in workerd runtime (production-like)
npm run deploy   # Build and deploy to Cloudflare

bun add -d @opennextjs/cloudflare

{
  "name": "my-next-app",
  "compatibility_date": "2025-05-05",
  "compatibility_flags": ["nodejs_compat"]
}

import { defineCloudflareConfig } from "@opennextjs/cloudflare";

export default defineCloudflareConfig({
  // Caching configuration (optional)
  // See: https://opennext.js.org/cloudflare/caching
});

{
  "scripts": {
    "dev": "next dev",
    "build": "next build",
    "preview": "opennextjs-cloudflare build && opennextjs-cloudflare preview",
    "deploy": "opennextjs-cloudflare build && opennextjs-cloudflare deploy",
    "cf-typegen": "wrangler types --env-interface CloudflareEnv cloudflare-env.d.ts"
  }
}

// ❌ REMOVE THIS (Edge runtime not supported)
export const runtime = "edge";

// ✅ Use Node.js runtime (default)
// No export needed - Node.js is default

{
  "compatibility_date": "2025-05-05",  // Minimum for FinalizationRegistry
  "compatibility_flags": ["nodejs_compat"]  // Required for Node.js runtime
}

// ❌ WRONG: Global client
const pool = new Pool({ connectionString: process.env.DATABASE_URL });

// ✅ CORRECT: Request-scoped
export async function GET() {
  const pool = new Pool({ connectionString: process.env.DATABASE_URL });
  // ... use pool
  await pool.end();
}

import type { NextRequest } from 'next/server';

export async function GET(request: NextRequest) {
  const env = process.env as any;

  // D1 Database
  const users = await env.DB.prepare('SELECT * FROM users').all();

  // R2 Storage
  const file = await env.BUCKET.get('file.txt');

  // KV Storage
  const value = await env.KV.get('key');

  // Workers AI
  const ai = await env.AI.run('@cf/meta/llama-3-8b-instruct', { prompt: 'Hello' });

  return Response.json({ users, file, value, ai });
}

{
  "d1_databases": [{ "binding": "DB", "database_id": "..." }],
  "r2_buckets": [{ "binding": "BUCKET", "bucket_name": "..." }],
  "kv_namespaces": [{ "binding": "KV", "id": "..." }],
  "ai": { "binding": "AI" }
}

undefined

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// wrangler.jsonc
{
  "compatibility_date": "2025-05-05",  // Minimum!
  "compatibility_flags": ["nodejs_compat"]  // Required!
}