Customizing Request Headers and Authentication in RTK Query
In RTK Query, you can easily customize HTTP request headers — including adding authentication tokens — using the fetchBaseQuery option or a custom base query. This allows you to attach tokens dynamically from your Redux store or local storage before each request.
1. Using
prepareHeaders: Modify headers before each request by accessing the Redux state or adding authentication tokens.2. Using a Custom Base Query: Create your own base query wrapper to handle special authentication logic, token refresh, or custom header rules.
3. Endpoint-Level Overrides: Add or modify headers directly within individual endpoints when specific routes require custom headers.
In this example, the prepareHeaders function adds an Authorization header for each request. It retrieves the token from the Redux store and ensures that every endpoint automatically uses it.
This approach gives full control over how requests and responses are handled, making it ideal for implementing token refresh workflows or handling special authentication rules.
By customizing headers with prepareHeaders or a custom base query, RTK Query enables secure and flexible communication with authenticated APIs.