JAVASCRIPT

axios post formdata

axios({
    method: 'post',
    url: 'myurl',
    data: bodyFormData,
    headers: {'Content-Type': 'multipart/form-data' }
    })
    .then(function (response) {
        //handle success
        console.log(response);
    })
    .catch(function (response) {
        //handle error
        console.log(response);
    });

Axios FormData / not JSON

var bodyFormData = new FormData();
bodyFormData.append('userName', 'Fred');

If you are uploading images, you may want to use .append
bodyFormData.append('image', imageFile); 

axios({
  method: "post",
  url: "myurl",
  data: bodyFormData,
  headers: { "Content-Type": "multipart/form-data" },
})
  .then(function (response) {
    //handle success
    console.log(response);
  })
  .catch(function (response) {
    //handle error
    console.log(response);
  });

axios post form data and json

doAjaxPost() {
    var formData = new FormData();
    var file = document.querySelector('#file');

    formData.append("file", file.files[0]);
    // formData.append("document", documentJson); instead of this, use the line below.
    formData.append("document", JSON.stringify(documentJson));

    axios({
        method: 'post',
        url: 'http://192.168.1.69:8080/api/files',
        data: formData,
    })
    .then(function (response) {
        console.log(response);
    })
    .catch(function (response) {
        console.log(response);
    });
}