Retool Fundamentals: Lesson 1

Learn how to connect your data source by creating a resource.

The first step in building an app is connecting your data source. Retool supports most databases and APIs, and you can use built-in integrations to connect to popular data sources with minimal configuration. You connect a data source by creating a resource in Retool. This guide uses a REST API as the resource.

1. Generate an API and sample data for your app

To work through Retool Fundamentals, you'll use Retool's API generator to create a test REST API with some sample data. When building your own apps, you'll often use an existing data source.

For this app, you'll generate a data set that includes the user's ID, name, email address, and whether the user's access is blocked. When you're ready, click the Generate API button and save the Endpoint URL.

2. Create a resource to connect your data source

Navigate to the Resources tab from the Retool homepage and click Create new > Resource. Select REST API and name the resource. In the Base URL field, paste the endpoint URL from the previous step and create the resource.

Creating a resourceCreating a resource

If you see a prompt for creating an app after saving the resource, go ahead and create an app and name it User management. If you don't see a prompt, navigate to the Apps tab in Retool and create an app named User management.

3. Write a test query

Queries are covered in more detail later, but it's a good idea to run one now to verify the connection to your resource. When you created the app, Retool automatically added query1 to it. You can find this query in the lower left corner of the bottom panel. Click on the query1 text and rename the query to getUsers.

Renaming query1Renaming query1

You can see that the resource you just added is selected, and that the query sends a GET request to your API. Click Run to verify the query works. You'll see a success message and a JSON response with your data.

Wrap up

Now that you have a resource you can access, it's time to start building your UI.

You can test your knowledge below or move on to the next lesson.


What’s Next

Continue to the next lesson to assemble your app's user interface.