What are some potential pitfalls when using JS/AJAX to fill in text and forms?

One potential pitfall when using JS/AJAX to fill in text and forms is the security risk of exposing sensitive information. To mitigate this risk, always validate and sanitize user input before displaying it on the page. 

// Sanitize user input before displaying it on the page
$user_input = $_POST['user_input'];
$sanitized_input = filter_var($user_input, FILTER_SANITIZE_STRING);

echo $sanitized_input;

Keywords

JavaScript AJAX text filling form filling error handling

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