Connect to databases
Cloudflare Workers can connect to and query your data in both SQL and NoSQL databases, including:
- Traditional hosted relational databases, including Postgres and MySQL.
- Serverless databases: Supabase, MongoDB Atlas, PlanetScale, FaunaDB, and Prisma.
- Cloudflare’s own D1, a serverless SQL-based database.
| Database | Integration | Library or Driver | Connection Method |
|---|---|---|---|
| Postgres | - | node-postgres | Workers Socket API |
| Postgres | - | deno-postgres | Cloudflare Tunnel |
| MySQL | - | deno-mysql | Cloudflare Tunnel |
| FaunaDB | No | faunadb | API via client library |
| PlanetScale | Yes | @planetscale/database | API via client library |
| Supabase | Yes | @supabase/supabase-js | API via client library |
| Mongo | No | realm-web | API via client library |
| Prisma | No | prisma | API via client library |
| Neon | Yes | @neondatabase/serverless | API via client library |
| Hasura | No | API | GraphQL API via fetch() |
| Upstash Redis | Yes | @upstash/redis | API via client library |
Once you have installed the necessary packages, use the APIs provided by these packages to connect to your database and perform operations on it. Refer to detailed links for service-specific instructions.
Connect to a database from a Worker
There are three ways to connect to a database from a Worker:
- Database Integrations: Simplifies authentication by managing credentials on your behalf and includes support for PlanetScale, Neon and Supabase.
- TCP Socket API: A direct TCP connection to a database. TCP is the de-facto standard protocol that many databases, such as PostgreSQL and MySQL, use for client connectivity.
- HTTP- or WebSocket-based serverless drivers: Many hosted databases support a HTTP or WebSocket API to enable either clients to connect from environments that do not support TCP, or as their preferred connection protocol.
Authentication
If your database requires authentication, use Wrangler secrets to securely store your credentials. To do this, create a secret in your Cloudflare Workers project using the following wrangler secret command:
Then, retrieve the secret value in your code using the following code snippet:
Use the secret value to authenticate with the external service. For example, if the external service requires an API key or database username and password for authentication, include these in using the relevant service’s library or API.
For services that require mTLS authentication, use mTLS certificates to present a client certificate.
Next steps
- Learn how to connect to an existing PostgreSQL database.
- Discover other storage options available for use with Workers.
- Create your first database with Cloudflare D1.