I have a jpeg as a base64 encoded string.
var image = "/9j/4AAQSkZJRgABAQEAS..."
I would like to upload this jpeg to the server using FormData.
var data = new FormData();
What is the proper way to append the image to data?
Your image data is nothing more than a string, so append it to your FormData object like this:
data.append("image_data", image);
Then on your server side you can store that directly in a database or convert it to an image and store it on the file system. You might find this post helpful.