Postgres.js

Postgres.js ↗ は、Node.js 向けのモダンで高機能な PostgreSQL ドライバーです。この例では、Workers アプリケーションで Cloudflare Hyperdrive と Postgres.js を組み合わせる方法を示します。

Postgres.js ↗ をインストールします。

npm i postgres@>3.4.5

yarn add postgres@>3.4.5

pnpm add postgres@>3.4.5

bun add postgres@>3.4.5

必要な Node.js 互換性フラグと Hyperdrive バインディングを wrangler.jsonc に追加します。

{
	// required for database drivers to function
	"compatibility_flags": [
		"nodejs_compat"
	],
	// Set this to today's date
	"compatibility_date": "2026-09-20",
	"hyperdrive": [
		{
			"binding": "HYPERDRIVE",
			"id": "<your-hyperdrive-id-here>"
		}
	]
}

compatibility_flags = [ "nodejs_compat" ]
# Set this to today's date
compatibility_date = "2026-09-20"

[[hyperdrive]]
binding = "HYPERDRIVE"
id = "<your-hyperdrive-id-here>"

Hyperdrive 経由で PostgreSQL データベースに接続する Worker を作成します。

// filepath: src/index.ts
import postgres from "postgres";

export default {
	async fetch(
		request: Request,
		env: Env,
		ctx: ExecutionContext,
	): Promise<Response> {
		// Create a database client that connects to your database via Hyperdrive.
		// Hyperdrive maintains the underlying database connection pool,
		// so creating a new client on each request is fast and recommended.
		const sql = postgres(env.HYPERDRIVE.connectionString, {
			// Limit the connections for the Worker request to 5 due to Workers' limits on concurrent external connections
			max: 5,
			// If you are not using array types in your Postgres schema, disable `fetch_types` to avoid an additional round-trip (unnecessary latency)
			fetch_types: false,

			// This is set to true by default, but certain query generators such as Kysely or queries using sql.unsafe() will set this to false. Hyperdrive will not cache prepared statements when this option is set to false and will require additional round-trips.  
			prepare: true,
		});

		try {
			// A very simple test query
			const result = await sql`select * from pg_tables`;

			// Return result rows as JSON
			return Response.json({ success: true, result: result });
		} catch (e: any) {
			console.error("Database error:", e.message);

			return Response.error();
		}
	},
} satisfies ExportedHandler<Env>;