Summary: Hasura Cloud connects to Lakebase Postgres either by OAuth (creating a new Neon project automatically) or by pasting an existing connection string into the Hasura Console. Connection limits depend on compute size and pooling settings, so tuning both Neon and Hasura values is required when hitting limits. Hasura event triggers, cron triggers, and source health checks can prevent Neon's scale-to-zero suspension.

Learn how to connect a Hasura Cloud project to a new or existing Neon database

Hasura Cloud is an open source GraphQL engine that provides a scalable, highly available, globally distributed, secure GraphQL API for your data sources.

Use the following instructions to connect to a new Neon database. This connection method authenticates you from Hasura Cloud.

1. Navigate to Hasura Cloud and sign up or log in.
2. On the Hasura Cloud dashboard, click Create a project to create a new Hasura project.
3. After the project is initialized, click Launch Console to open the Hasura Console.
4. On the Hasura Console, Select Data from the top navigation bar.
5. Click Postgres > Connect Neon Database.
6. When prompted to login or sign up for Neon, we recommend selecting Hasura for seamless authentication.
7. You will be redirected to an Oauth page to authorize Hasura to access your Neon account. Click Authorize to allow Hasura to create a new Neon project and database.

After authenticating, a new Lakebase Postgres database is created and connected to your Hasura project, and the Neon project connection string is associated with the PG_DATABASE_URL environment variable.

To start exploring Hasura's GraphQL API with data stored in the database, see Load a template in Hasura.

Use the following instructions to connect to an existing Neon database from Hasura Cloud. The connection is configured manually using a connection string.

• An existing Neon account. If you do not have one, see Sign up.

• An existing Neon project. If you do not have a Neon project, see Create a project.

• A connection string for a database in your Neon project:

  postgresql://[user]:[password]@[neon_hostname]/[dbname]

  You can find your database connection string by clicking the Connect button in the Console nav. For more information, see Connect from any application.

The following steps describe how to navigate to Hasura Cloud and connect to your Neon project.

1. Navigate to Hasura Cloud and sign up or log in.

2. Click Create Project to create a Hasura Cloud project or click Launch Console to open an existing project.

3. In the Hasura Console, select Data from the top navigation bar.

4. Click Postgres > Connect Existing Database.

5. Paste your connection string into the Database URL field.

   Tip: To enhance security and manageability, consider using environment variables in Hasura instead of hardcoding the connection string. To do this, navigate to Hasura Project settings > Env vars > New env var and create a new variable (for example, NEON_DATABASE_URL) with your connection string as its value.

   

   Then, in the connection tab, select Connect database via Environment variable and enter the variable name you created. This approach keeps your connection string secure and simplifies future updates.

6. Enter a display name for your database in the Database name field, and click Connect Database.

Hasura Cloud connects to your Neon project and automatically discovers the default public schema.

To start exploring Hasura's GraphQL API with data stored in Neon, see Load a template in Hasura.

Optionally, after connecting from your Hasura project to Neon, you can explore Hasura's GraphQL API by loading a template from Hasura's template gallery. Follow these steps to load the Welcome to Hasura template, which creates customer and order tables and populates them with sample data.

1. In the Hasura Console, select Data.
2. Under Data Manager, select your database.
3. From the Template Gallery, select Welcome to Hasura to install the template.

To view the newly created tables from the Neon Console:

1. In the Hasura Console, select Data > Manage your Neon databases to open the Neon Console.
2. In the Neon Console, select your project.
3. Select the Tables tab. The newly created customer and order tables should appear under the Tables heading in the sidebar.

If you are migrating from Hasura with Heroku Postgres to Neon, refer to the Import data from Heroku guide for data import instructions. For general data import instructions, see Import data from Postgres.

In Neon, the maximum number of concurrent connections is defined according to the size of your compute. For example, a 0.25 CU compute in Neon supports 112 connections. The connection limit is higher with larger compute sizes (see How to size your compute). You can also enable connection pooling in Neon to support up to 10,000 concurrent connections. However, it is important to note that Hasura has a HASURA_GRAPHQL_PG_CONNECTIONS setting that limits Postgres connections to 50 by default. If you start encountering errors related to "max connections", try increasing the value of this setting as a first step, staying within the connection limit for your Neon compute. For information about the Hasura connection limit setting, refer to the Hasura Postgres configuration documentation.

Neon suspends a compute after five minutes (300 seconds) of inactivity. This behavior can be adjusted on Neon's paid plans. For more information, refer to Configuring Scale to zero for Neon computes.

If you rely on Neon's scale to zero feature to minimize database usage, note that certain Hasura configuration options can keep your Neon compute in an active state:

• Event triggers may periodically poll your Neon database for new events.
• Cron triggers can invoke HTTP endpoints that execute custom business logic involving your Neon database.
• Source Health Checks can keep your Neon compute active if the metadata database resides in Neon.

• AskYourDatabase
• Cloudflare Hyperdrive
• Draxlr
• Exograph
• Grafbase
• PostgREST
• WunderGraph

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