Axios sending my plain JSON with data-binary format

Question

When My Vuejs code try to post JSON, backend returned 400 error.

I found clue for that by chrome network capture.
My Axios code sended JSON with data-binary format.

curl 'http://localhost:5000/api/auth/login'  \
  -H 'Content-Type: application/json;charset=UTF-8' \
  -H 'Accept: application/json' \
  --data-binary '{"username":"admin","password":"ehllow"}'

But I don't know how it works like it.
My expecting request is

curl ... -D '{"username":"admin","password":"ehllow"}'`

not --data-binary

Here is my javascript code.

axios({
  method: 'post',
  url: '/api/auth/login',
  data: {
    "username": "admin",
    "password": "ehllow"
  },
  config: {
    headers: {
      'Content-Type': 'application/json'
    }
  }
})
.then(function (response) {
  //handle success
  console.log(response);
})
.catch(function (response) {
  //handle error
  console.log(response);
});

How can I change my axios code to send json to normal Data(-D)

Answer 1

I had the same question, answer was here: axios post request to send form data

In short:

let data = new FormData();
data.set("username", "admin");
data.set("password", "ehllow");
axios({
  method: 'post',
  url: '/api/auth/login',
  data: data,
  config: {
    headers: {
      'Content-Type': 'application/json'
    }
  }
})

Threw me for a loop, as binary data is read differently than form data.