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AJAX fetch request failing with 500 internal server error

Posted on April 25, 2026, 2:18 pm • 404 Views
Sending a POST request via JS Fetch API, but the PHP backend crashes.
If you used `fetch()`, it sends data as a JSON payload, NOT as form-data. PHP's `$_POST` array will be empty. You must read the data using `json_decode(file_get_contents("php://input"), true);`.

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