16. How can RTK Query work with GraphQL or custom fetch logic?

Integrating RTK Query with GraphQL and Custom Fetch Logic

RTK Query can be integrated with GraphQL or any custom fetch logic by using a custom baseQuery. Instead of relying on REST-style endpoints, you can define your own query function that sends GraphQL requests or handles special request logic.

Ways to Work with GraphQL or Custom Fetch Logic

1. Using fetchBaseQuery for Simple GraphQL Requests: Pass a static GraphQL query string and variables directly to the body of the request.
2. Creating a Custom baseQuery: Use your own fetch or Axios logic to send requests and handle responses.
3. Wrapping GraphQL Clients (e.g., Apollo, urql): Integrate RTK Query with existing GraphQL client instances to share caching and schema handling.

Example 1: Simple GraphQL Query with fetchBaseQuery

In this example, RTK Query sends a POST request containing a GraphQL query string in the request body. The hook useGetUsersQuery() automatically handles caching, loading, and error states.

Example 2: Using a Custom Base Query with fetch() or Axios

This custom base query gives you full flexibility — allowing you to handle GraphQL operations, custom headers, authentication, or even token refresh logic as needed.

In summary, RTK Query is backend-agnostic. Whether you use REST, GraphQL, or a completely custom fetch implementation, you can adapt it easily by defining the right baseQuery function.

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