var fs = require('fs');
 
var form = new URLSearchParams();
form.append('my_field', 'my value');
form.append('my_buffer', new Buffer(10));
form.append('my_file', fs.createReadStream('/foo/bar.jpg'));

const formData = new URLSearchParams();
formData.append('field1', 'value1');
formData.append('field2', 'value2');
const response = await axios.request({
  url: 'https://example.com',
  method: 'POST',
  headers: {'Content-Type': 'application/x-www-form-urlencoded'},
  data: formData
});