What are the common mistakes to avoid when attempting to fetch and display data from a PHP file using AJAX in a web application?

One common mistake to avoid when fetching and displaying data from a PHP file using AJAX is not setting the appropriate headers in the PHP file to indicate that the response should be in JSON format. To solve this issue, you should set the 'Content-Type' header to 'application/json' in the PHP file. 

<?php
header('Content-Type: application/json');
// Your PHP code to fetch and process data
echo json_encode($yourDataArray);
?>

Keywords

AJAX PHP file data fetching data display web application

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