javascript - How to upload string as file with jQuery or other js framework

Question

Using javascript, I have a file in string (got with ajax request).

How to upload it as file to server by another ajax request ?

Answer 1

Here's how to do it without manually building the multi-part request body:

var s = 'some string data';
var filename = 'foobar.txt';

var formData = new FormData();
formData.append('file', new File([new Blob([s])], filename));
formData.append('another-form-field', 'some value');

$.ajax({
    url: '/upload',
    data: formData,
    processData: false,
    contentType: false,
    type: 'POST',
    success: function () {
        console.log('ok');
    },
    error: function () {
        console.log('err'); // replace with proper error handling
    }
});