How to Upload Blob Objects to a Server Using JavaScript and jQuery?

Uploading Blobs with JavaScript

In this article, we'll explore how to upload a blob object, such as audio data recorded using Chrome's getUserMedia() and Recorder.js, to a server using JavaScript.

Problem:

We have a blob object with sound data, but need assistance with uploading it to a server using jQuery's post method.

Solution:

To upload a blob, we can utilize the FormData API. This approach is necessary because jQuery's post method expects form data.

jQuery Implementation:

1. Create a new FormData object.
2. Append blob data to the FormData using fd.append('data', soundBlob).
3. Set processData and contentType to false in the jQuery.ajax settings to prevent jQuery from automatically processing the form data. This allows us to upload the raw blob data.
4. Send the FormData object to the server using jQuery.ajax.

Example Code:

<code class="javascript">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);
});</code>

By following these steps, you can successfully upload blob data to a server using JavaScript and jQuery.

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