API Error Handling in React

Understanding API Errors in React

API errors typically fall into two categories: network errors and server errors.

Network errors occur when the request cannot reach the server, while server errors happen when the server responds with an error status code.

• Network errors: no internet, DNS failure, request timeout.
• Server errors: 4xx client errors, 5xx server errors.
• Unexpected data or malformed responses.

Handling API Errors with Fetch

The fetch API returns a promise that resolves even for HTTP error status codes, so you must check the response status explicitly.

Use try-catch blocks with async-await or .catch() with promises to handle network errors.

• Check response.ok to detect HTTP errors.
• Throw errors for non-ok responses to trigger catch blocks.
• Display error messages based on error type.

Handling API Errors with Axios

Axios automatically rejects the promise for HTTP error status codes, simplifying error handling.

You can access error details in the catch block to provide specific feedback.

• Use try-catch or .catch() to handle errors.
• Check error.response for server errors.
• Handle error.request for network issues.

Best Practices for API Error Handling in React

Implementing consistent and user-friendly error handling improves app reliability and user trust.

• Always handle both network and HTTP errors.
• Provide clear, actionable error messages to users.
• Use loading and error states in your components.
• Consider retry mechanisms for transient errors.
• Use React error boundaries for catching rendering errors.