How can javascript upload a blob?

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You can use the FormData API.

If you’re using jquery.ajax, you need to set processData: false and contentType: false.

var fd = new FormData();
fd.append('fname', 'test.wav');
fd.append('data', soundBlob);
$.ajax({
    type: 'POST',
    url: '/upload.php',
    data: fd,
    processData: false,
    contentType: false
}).done(function(data) {
       console.log(data);
});

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