How to Upload a Blob to a Server Using jQuery?

Uploading a Blob in JavaScript

Uploading a data blob, such as audio or video data recorded using HTML5 APIs, to a server is a common task in web applications. This article demonstrates how to use JavaScript, specifically jQuery, to upload a blob to a server.

jQuery File Upload Method

The jQuery post() method, as used in the provided code snippet, is not suitable for uploading binary data like blobs. Instead, the FormData API is recommended for this purpose.

Creating a FormData Object

To use FormData, create a new FormData object and append the necessary data to it. In the provided example, append the file name and the blob data to the FormData object:

<code class="javascript">var fd = new FormData();
fd.append('fname', 'test.wav');
fd.append('data', soundBlob);</code>

AJAX Request with jQuery

Next, use jQuery's $.ajax() method to send the FormData object as a multipart/form-data request. Specify the request type, URL, and data, and set processData and contentType to false:

<code class="javascript">$.ajax({
    type: 'POST',
    url: '/upload.php',
    data: fd,
    processData: false,
    contentType: false
}).done(function(data) {
       console.log(data);
});</code>

This code sends the blob data along with the file name to the server-side PHP script at /upload.php, and logs the response.

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