[Vuejs]-Passing scanned QR content to PHP

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You can defer execution of window.location.assign() until after the post completes by using a callback in $.post:

$.post("scanquery.php", {qr: content}, () => {
    window.location.assign("scanquery.php");
});

I think you have a mismatch in your payload types. $.post is formatting your object as JSON, and $_POST is not made available for JSON posts.

This source (https://davidwalsh.name/php-json) notes how to process incoming data as JSON:

# Get JSON as a string
$json_str = file_get_contents('php://input');

# Get as an object
$json_obj = json_decode($json_str);

Someone more of an expert on PHP can correct me on this part.

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