Connect a Cloudflare Worker to an external Postgres database through Hyperdrive using node-postgres, including nodejs_compat setup and local development.
domain: developers.cloudflare.com · 8 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Create a Hyperdrive configuration for your database: npx wrangler hyperdrive create <YOUR_CONFIG_NAME> --connection-string="postgres://user:password@HOSTNAME_OR_IP:PORT/database_name". https://developers.cloudflare.com/hyperdrive/get-started/
Copy the returned id and add a hyperdrive binding to the wrangler config: {"hyperdrive": [{"binding": "HYPERDRIVE", "id": "<YOUR_DATABASE_ID>"}]}. https://developers.cloudflare.com/hyperdrive/get-started/
Enable Node.js compatibility, required for the pg driver: set "compatibility_flags": ["nodejs_compat"] and "compatibility_date" to 2024-09-23 or later in the wrangler config. https://developers.cloudflare.com/hyperdrive/get-started/
Install the driver: npm i pg (v8.13.0 or later), plus npm i -D @types/pg if using TypeScript. https://developers.cloudflare.com/hyperdrive/get-started/
In the Worker, create a client per request using the Hyperdrive connection string: const sql = new Client({ connectionString: env.HYPERDRIVE.connectionString }); await sql.connect(); const results = await sql.query("SELECT ..."). Hyperdrive keeps pooling the underlying DB connection even though a new client is created each request. https://developers.cloudflare.com/hyperdrive/get-started/
For local dev, either add "localConnectionString" to the hyperdrive binding in the wrangler config, or export CLOUDFLARE_HYPERDRIVE_LOCAL_CONNECTION_STRING_<BINDING_NAME> (e.g. CLOUDFLARE_HYPERDRIVE_LOCAL_CONNECTION_STRING_HYPERDRIVE="postgres://..."), then run npx wrangler dev. https://developers.cloudflare.com/hyperdrive/configuration/local-development/
To test against the deployed Hyperdrive config with caching enabled instead of a local DB, run npx wrangler dev --remote (this executes your whole Worker on Cloudflare's network). https://developers.cloudflare.com/hyperdrive/get-started/
Deploy with npx wrangler deploy. https://developers.cloudflare.com/hyperdrive/get-started/
Known gotchas
The local-dev override env var is CLOUDFLARE_HYPERDRIVE_LOCAL_CONNECTION_STRING_<BINDING_NAME> (per-binding suffix), not a single generic variable name — confirm the exact suffix matches your binding name. https://developers.cloudflare.com/hyperdrive/configuration/local-development/
When using localConnectionString or its env var, Hyperdrive's connection pooling and query caching do not take effect — those only apply to the deployed/remote configuration. https://developers.cloudflare.com/hyperdrive/configuration/local-development/
Hyperdrive caches eligible read queries for 60 seconds by default and does not invalidate on writes; pass --caching-disabled at creation, or use --max-age, or a separate cache-disabled config, if you need read-after-write consistency. https://developers.cloudflare.com/hyperdrive/get-started/
nodejs_compat plus a compatibility_date of 2024-09-23 or later is required for the pg driver to run in a Worker. https://developers.cloudflare.com/hyperdrive/get-started/
wrangler hyperdrive create verifies the supplied credentials by actually connecting to the database at creation time, so the database must be reachable (publicly, or via Workers VPC/private connectivity) before the command succeeds. https://developers.cloudflare.com/hyperdrive/get-started/
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