How to use the formdata in the client request method?

I making an API calls inside the SDK application with the Axios POST method and Formdata, you can in the below code.

const axios = require('axios');
const FormData = require('form-data');
let data = new FormData();
data.append('username', 'balu');
data.append('key', jhjjjjhjjjhh');
data.append('email', 'anish.k@spritle.com');

let config = {
  method: 'post',
  maxBodyLength: Infinity,
  url: 'https://opencart.ajithr.com/index.php?route=zendesk/customer',
  headers: { 
    'Content-Type': 'application/json', 
    'Cookie': 'OCSESSID=0c4898f4cd2a443a21c3fb3324; currency=USD', 
    ...data.getHeaders()
  },
  data : data
};

axios.request(config)
.then((response) => {
  console.log(JSON.stringify(response.data));
})
.catch((error) => {
  console.log(error);
});

How can I change this Axios method into a client method? 

I documentation also can't able to find it.

Thanks in advance.