Cloudflare Hyperdrive

Status: Production Ready ✅ | Last Verified: 2025-11-18

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What Is Hyperdrive?

Connect Workers to existing PostgreSQL/MySQL databases:

• Global connection pooling
• Query caching
• Reduced latency
• Works with node-postgres, postgres.js, mysql2

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Quick Start (5 Minutes)

1. Create Hyperdrive Config

bunx wrangler hyperdrive create my-db \
  --connection-string="postgres://user:pass@host:5432/database"

Save the id!

2. Configure Binding

{
  "name": "my-worker",
  "main": "src/index.ts",
  "compatibility_date": "2024-09-23",
  "compatibility_flags": ["nodejs_compat"],  // REQUIRED!
  "hyperdrive": [
    {
      "binding": "HYPERDRIVE",
      "id": "<ID_FROM_STEP_1>"
    }
  ]
}

3. Install Driver

bun add pg  # or postgres, or mysql2

4. Query Database

import { Client } from 'pg';

export default {
  async fetch(request, env, ctx) {
    const client = new Client({ connectionString: env.HYPERDRIVE.connectionString });
    await client.connect();

    const result = await client.query('SELECT * FROM users LIMIT 10');
    await client.end();

    return Response.json(result.rows);
  }
};

Load references/setup-guide.md for complete walkthrough.

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Critical Rules

Always Do ✅

1. Enable nodejs_compat flag (required!)
2. Use env.HYPERDRIVE.connectionString (not original DB string)
3. Close connections after queries
4. Handle errors explicitly
5. Use connection pooling (built-in)
6. Test locally with wrangler dev
7. Monitor query performance
8. Use prepared statements
9. Enable query caching (automatic)
10. Secure connection strings (use secrets)

Never Do ❌

1. Never skip nodejs_compat (drivers won't work)
2. Never use original DB connection string in Workers
3. Never leave connections open (pool exhaustion)
4. Never skip error handling (DB can fail)
5. Never hardcode credentials in code
6. Never exceed connection limits
7. Never use eval/Function (blocked in Workers)
8. Never skip TLS for production DBs
9. Never use blocking queries (Worker timeout)
10. Never expose DB errors to users

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Database Drivers

PostgreSQL (node-postgres)

import { Client } from 'pg';

const client = new Client({ connectionString: env.HYPERDRIVE.connectionString });
await client.connect();
const result = await client.query('SELECT * FROM users');
await client.end();

PostgreSQL (postgres.js)

import postgres from 'postgres';

const sql = postgres(env.HYPERDRIVE.connectionString);
const users = await sql`SELECT * FROM users`;

MySQL

import mysql from 'mysql2/promise';

const connection = await mysql.createConnection(env.HYPERDRIVE.connectionString);
const [rows] = await connection.execute('SELECT * FROM users');
await connection.end();

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With Drizzle ORM

import { drizzle } from 'drizzle-orm/node-postgres';
import { Client } from 'pg';

const client = new Client({ connectionString: env.HYPERDRIVE.connectionString });
await client.connect();

const db = drizzle(client);
const users = await db.select().from(usersTable);

await client.end();

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Common Use Cases

Use Case 1: Read-Only Queries

export default {
  async fetch(request, env, ctx) {
    const client = new Client({ connectionString: env.HYPERDRIVE.connectionString });
    await client.connect();

    const users = await client.query('SELECT * FROM users WHERE active = true');
    await client.end();

    return Response.json(users.rows);
  }
};

Use Case 2: Parameterized Queries

const userId = new URL(request.url).searchParams.get('id');

const client = new Client({ connectionString: env.HYPERDRIVE.connectionString });
await client.connect();

const result = await client.query(
  'SELECT * FROM users WHERE id = $1',
  [userId]
);

await client.end();

Use Case 3: Transactions

const client = new Client({ connectionString: env.HYPERDRIVE.connectionString });
await client.connect();

try {
  await client.query('BEGIN');
  await client.query('UPDATE accounts SET balance = balance - 100 WHERE id = $1', [1]);
  await client.query('UPDATE accounts SET balance = balance + 100 WHERE id = $1', [2]);
  await client.query('COMMIT');
} catch (e) {
  await client.query('ROLLBACK');
  throw e;
} finally {
  await client.end();
}

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Supported Databases

PostgreSQL:

• Amazon RDS
• Amazon Aurora
• Neon
• Supabase
• Railway
• Render
• DigitalOcean
• Any PostgreSQL 11+

MySQL:

• Amazon RDS
• Amazon Aurora
• PlanetScale
• Any MySQL 5.7+

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Official Documentation

• Hyperdrive Overview: https://developers.cloudflare.com/hyperdrive/
• Get Started: https://developers.cloudflare.com/hyperdrive/get-started/
• Configuration: https://developers.cloudflare.com/hyperdrive/configuration/

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Bundled Resources

References (references/):

• setup-guide.md - Complete setup walkthrough (create config, bind, query)
• connection-pooling.md - Connection pool configuration and best practices
• query-caching.md - Query caching strategies and optimization
• drizzle-integration.md - Drizzle ORM integration patterns
• prisma-integration.md - Prisma ORM integration patterns
• supported-databases.md - Complete list of supported PostgreSQL and MySQL providers
• tls-ssl-setup.md - TLS/SSL configuration for secure connections
• troubleshooting.md - Common issues and solutions
• wrangler-commands.md - Complete wrangler CLI commands for Hyperdrive

Templates (templates/):

• postgres-basic.ts - Basic PostgreSQL with node-postgres
• postgres-js.ts - PostgreSQL with postgres.js driver
• postgres-pool.ts - PostgreSQL with connection pooling
• mysql2-basic.ts - MySQL with mysql2 driver
• drizzle-postgres.ts - Drizzle ORM with PostgreSQL
• drizzle-mysql.ts - Drizzle ORM with MySQL
• prisma-postgres.ts - Prisma ORM with PostgreSQL
• local-dev-setup.sh - Local development setup script
• wrangler-hyperdrive-config.jsonc - Wrangler configuration example

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Questions? Issues?

1. Check references/setup-guide.md for complete setup
2. Verify nodejs_compat flag enabled
3. Ensure using env.HYPERDRIVE.connectionString
4. Check connection properly closed