React.js, how to send a multipart/form-data to server

Question

We want to send an image file as multipart/form to the backend, we try to use html form to get file and send the file as formData, here are the codes

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Answer 1

For sending multipart/formdata, you need to avoid contentType, since the browser automatically assigns the boundary and Content-Type.

In your case by using fetch, even if you avoid Content-Type it sets to default text/plain. So try with jQuery ajax. which removes the contentType if we set it to false.

This is the working code

var data = new FormData();
var imagedata = document.querySelector('input[type="file"]').files[0];
data.append("data", imagedata);
$.ajax({
    method: "POST",
    url: fullUrl,
    data: data,
    dataType: 'json',
    cache: false,
    processData: false,
    contentType: false
}).done((data) => {
    //resolve(data);
}).fail((err) => {
    //console.log("errorrr for file upload", err);
    //reject(err);
});