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Connect to gRPC

Learn how to connect your gRPC database to Retool.

You can use the gRPC integration to create a resource and make it available in Retool. Once complete, your users can write queries that interact with gRPC data.


The gRPC integration requirements depend on whether you have a cloud-hosted or self-hosted Retool organization. You may also need to make gRPC configuration changes before creating the resource.

Sufficient user permissions to create resources

All users for Retool organizations on Free or Team plans have global Edit permissions and can add, edit, and remove resources. If your organization manages user permissions for resources, you must be a member of a group with Edit all permissions.

Allow Retool to access the data source

If the data source is behind a firewall or restricts access based on IP address, then you must ensure that your Retool organization can access it. If necessary, configure your data source to allow access from Retool's IP addresses.

CIDR IP addresses
Individual IP addresses
gRPC settings and authentication

You must have sufficient access and familiarity with your gRPC data source so you can provide:

  • Required connection settings (e.g., URL and server variables).
  • Authentication credentials (e.g., API keys).

In some cases, you may need to make changes to your gRPC configuration, such as generating authentication credentials or allowing access through a firewall. Refer to the configuration and authentication sections to learn more.

Configure the resource

Sign in to your Retool organization and navigate to the Resources tab. Click Create new > Resource, then select gRPC.


Specify the name, location, and description to use for your gRPC resource. Retool displays the resource name and type in query editors to help users identify them.

Provide the following configuration settings to create the resource. Depending on how your data source is configured, you may also need to provide optional settings for Retool to connect.


The name to use for the resource.


A description of the resource.


The host server address.


The host server connection port.

Service definition source

Whether to use server reflection or import a Proto file.

Maximum incoming message size

The maximum incoming message size, in bytes.

Maximum outgoing message size

The maximum outgoing message size, in bytes.


Key-value pairs for metadata.

Override default outbound Retool region

Retool connects to your data source from the us-west-2 region. Choosing a different outbound region can improve performance through geographic proximity.

us-west-2US West (Oregon)
eu-central-1(Frankfurt, Germany)


The gRPC integration supports the following authentication methods. Depending on which authentication method you use, you may need to make changes to your gRPC configuration.


Authentication is performed using an Auth0 client application. You must create this application and then provide the details.

DomainThe domain URL.
Client IDThe client ID.
Client secretThe client secret.
AudienceThe audience URL.
Bearer Token

Authentication is performed using Bearer HTTP authentication with a token. You must be able to obtain and provide these credentials to create the resource.

Custom OAuth 2.0 client credentials

Authentication is performed using a custom OAuth 2.0 client app. You must create this client and then provide its credentials. Once configured, your users are redirected to to sign in and authorize Retool to access data.

OAuth apps typically require the following values during creation:

  • OAuth callback URL: The URL to which users are redirected once they have successfully signed in.
  • Scopes : The permissions granted to Retool. Each scope defines a specific set of permissions (e.g., messages:read to read messages users:write to create new users). You must ensure that any scopes defined in your OAuth app matches the scopes you specify when configuring the resource.

Once you've created an OAuth app you can obtain its credentials, such as the Client ID and Client secret. You then provide these to configure Retool for OAuth authentication.

Refer to the documentation for detailed instructions on creating an OAuth app.

Authorization URL

The URL with which to authenticate.

Access token URL

The access token URL.

Client ID

The client ID with which to authenticate.

Client secret

The client secret with which to authenticate.


Scopes govern what permissions Retool has once you connect your account authenticates. For some integrations, Retool automatically populates a set of recommended scopes to make full use of the integration. In some cases, you may need to specify the scopes for Retool to use.


The type of prompt when users authenticate.

NoneAttempt to authorize silently without using a prompt.
ConsentPrompt the user to consent.
LoginRequire the user to sign in with the provider, regardless of whether they are currently signed in.
Select accountRequire the user to select an account if they could be signed into multiple accounts.
No promptDo not display a prompt.

The OAuth 2.0 audience.

Enable an auth verification endpoint

Whether to use a custom authentication verification URL.

If enabled, you can provide an endpoint that will return a response code in the range 200-299 when the user is authenticated, and a non-2xx status code (e.g., 401 Unauthorized) when the user is not authenticated.

Skip Retool consent screen and attempt login

Whether to skip the Retool consent screen at the start of the authentication flow.

Access token lifespan

The lifespan of the access token before it expires.

Test the connection

Click Test Connection to verify that Retool can successfully connect to the data source. If the test fails, check the resource settings and try again.

Testing only verifies connection

Testing a connection only checks whether Retool can successfully connect to the resource. It cannot check whether the provided credentials have sufficient privileges or can perform every supported action.

Save the resource

Click Create resource to complete the setup. You can then click either Create app to immediately start building a Retool app or Back to resources to return to the list of resources.

Wrap up

Your gRPC resource is now ready to use. To start querying data:

  1. Add a Resource query to an app or workflow.
  2. Select the gRPC resource from the resources dropdown.
  3. Write and run a query.