Javascript: Uploading a file… without a file

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If you don’t need support for older browsers, you can use the FormData Object, which is part of the File API:

const formData = new FormData();
const blob = new Blob(['Lorem ipsum'], { type: 'plain/text' });
formData.append('file', blob, 'readme.txt');

const request = new XMLHttpRequest();
request.open('POST', 'http://example.org/upload');
request.send(formData);

File API is supported by all current browsers (IE10+)

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