Ajax Request Returns 200 Ok, but an Error Event Is Fired Instead of Success

Ajax request returns 200 OK, but an error event is fired instead of success

If you’ve ever encountered a situation where your Ajax request returns a 200 OK status code, indicating a successful request, but the error event is fired instead of the success event, you’re not alone. This issue can be quite frustrating, but fear not, there are solutions available.

1. Check the Response Content-Type

One possible reason for this issue is that the response from the server is not being interpreted correctly by the client. It could be due to an incorrect Content-Type header being set on the server-side or the response not matching the expected Content-Type on the client-side.

To troubleshoot this, you can inspect the response headers using browser developer tools. Look for the “Content-Type” header and ensure it matches the expected type, typically “application/json” or “text/plain”. If it doesn’t match, you may need to update the server-side code to set the correct Content-Type header.

2. Handle Errors in the Success Callback

Another possible reason for this issue is that the server is returning a successful response with an error message embedded in the response body. In this case, the error event is fired because the response is not in the expected format.

To handle this situation, you can modify your success callback function to check for any error messages in the response and handle them accordingly. Here’s an example:

$.ajax({
  url: "your-url",
  success: function(response) {
    if (response.error) {
      // Handle the error here
    } else {
      // Process the successful response
    }
  },
  error: function(xhr, status, error) {
    // Handle other types of errors here
  }
});

3. Use the Complete Callback

If none of the above solutions work, you can try using the complete callback instead of the success callback. The complete callback is always called, regardless of whether the request was successful or not.

Here’s an example of how you can use the complete callback:

$.ajax({
  url: "your-url",
  complete: function(xhr, status) {
    if (status === "success") {
      // Process the successful response
    } else {
      // Handle the error here
    }
  }
});

By using the complete callback, you can ensure that your code executes regardless of the request’s outcome.

Conclusion

Encountering a situation where an Ajax request returns a 200 OK status code but triggers the error event can be perplexing. However, by checking the response Content-Type, handling errors in the success callback, or using the complete callback, you can effectively troubleshoot and resolve this issue.

Remember to always verify the response headers, handle any error messages in the response, and consider using the complete callback as an alternative solution. With these approaches, you’ll be on your way to successfully handling Ajax requests in no time.

That’s it for this post! We hope you found these solutions helpful. If you have any further questions or suggestions, feel free to leave a comment below.

Happy coding!