First things first, log in to your Xano account and head over to your workspace. On the left side menu, find the "API" tab. That's where you'll access your API endpoints.

Now, pick an existing API endpoint you want to tweak, or if you're feeling adventurous, create a new one by clicking on the "Add API Endpoint" button.

Inside your chosen API endpoint, look for the "Request" section. There, you'll see a "Validation Schema" tab. Click on it.

To set up the schema, hit the "Add Field" button. Enter the field name, pick the data type (like string, number, boolean), and set any constraints you need, such as required, minimum length, maximum length, or pattern.

If your request has nested objects or arrays, click the "+" button next to the field to add those nested fields. Define their properties just like you did for the top-level fields.

For more complex scenarios, you can add conditional logic by clicking on the "Add Condition" button. Set up conditions based on other field values to make sure the request follows your validation rules.

Double-check everything to make sure it matches the expected input format. When you're happy with it, click the "Save" button to lock in the validation schema.

Time to test! Use tools like Postman or the Xano API Explorer to make a test call to your API endpoint. Submit both valid and invalid data to see if the request validation schema works as expected.

Keep an eye on how the API endpoint is being used and any feedback you get. Make updates or improvements to the request validation schema as needed to keep up with changes in the API requirements or data structure.