Building a Custom React Hook for API Calls
A step-by-step guide to creating a reusable hook for handling data fetching with loading and error states.
Custom hooks are one of React's most powerful features. They let you extract component logic into reusable functions. In this article, we'll build a hook for API calls that handles loading, errors, and data.
The Basic Structure
Let's start with a basic hook that manages our three states: data, loading, and error. We'll use TypeScript generics to make it type-safe.
Adding Refetch Capability
Often you'll want to refetch data after a user action. Let's add a refetch function to our hook.
Usage Example
Here's how you'd use the hook in a component. The generic type ensures type safety throughout.
Key Takeaways
- Custom hooks encapsulate reusable logic
- TypeScript generics provide type safety
- useCallback prevents unnecessary re-fetches
- Exposing a refetch function adds flexibility
This is just the foundation. You could extend it with caching, request cancellation, or optimistic updates. The beauty of custom hooks is that complexity stays encapsulated.