How to Retrieve Detailed Error Messages from jQuery\'s AJAX Error Response?

Understanding jQuery's AJAX Error Response

When sending error responses in jQuery, retrieving the detailed text message can pose a challenge. By default, jQuery only provides a generic 'error' message, leaving you with limited information.

In the example provided, an HTTP 500 error is sent with a custom message "Gone to the beach". However, when using the error callback in jQuery, the console log and alert display only "error".

Accessing the Error Response Text

To access the actual error response text, you can modify the error callback function. Here's how:

<code class="javascript">$.ajax({
  type: "post",
  data: { id: 0 },
  cache: false,
  url: "doIt.php",
  dataType: "text",
  error: function(xhr, status, error) {
    var err = eval("(" + xhr.responseText + ")");
    alert("Can't do because: " + err.Message);
  },
  success: function() { alert("Done ! "); }
});</code>

In this modified code:

• xhr is the XMLHttpRequest object that contains the error response.
• xhr.responseText holds the actual error response text.
• eval("(" xhr.responseText ")") converts the JSON string returned by the server into a JavaScript object.
• You can then access specific error properties, such as err.Message, to display the detailed error message.

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