sending file and json in POST multipart/form-data request with axios

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To set a content-type you need to pass a file-like object. You can create one using a Blob.

const obj = {
  hello: "world"
};
const json = JSON.stringify(obj);
const blob = new Blob([json], {
  type: 'application/json'
});
const data = new FormData();
data.append("document", blob);
axios({
  method: 'post',
  url: '/sample',
  data: data,
})

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