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How can I convert jQuery ajax to fetch?

This was my jQuery code before. Now I want to change it to fetch.

    function fetch(){
    jQuery.ajax({
        url: '<?php echo admin_url('admin-ajax.php'); ?>',
        type: 'post',
        data: { action: 'data_fetch', keyword: jQuery('#keyword').val(), pcat: jQuery('#cat').val() },
        success: function(data) {
            jQuery('#datafetch').html( data );
        }
    });
}

I have changed the code to this now but I am getting bad request 400 status code

document.querySelector('#keyword').addEventListener('keyup',()=>{
    let data = {
    action: 'data_fetch',
    keyword: document.querySelector("#keyword").value
};
let url = "<?php echo admin_url('admin-ajax.php'); ?>";
fetch(url, {
        method: 'POST', // or 'PUT'
        headers: {
            'Content-Type': 'application/json',
        },
        body: JSON.stringify(data),
    })
    .then((response) => response.text())
    .then((data) => {
        document.querySelector("#datafetch").innerHTML = data;
    })
    .catch((error) => {
        console.error('Error:', error);
    });
})

Am I missing something? It is from WordPress if this helps somehow.

Via Active questions tagged javascript - Stack Overflow https://ift.tt/x9p2GDY
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