axios-sample.js

var axios = require('axios');
var qs = require('qs');
var data = qs.stringify({
 'jsonString': '{\n	"email" : "srm@gmail.com",\n	"role" : "admin",\n	"first_name" : "Srirama Moorthy",\n         "last_name":"Srm"\n}' 
});
var config = {
  method: 'post',
  url: 'https://api.goschedule.io/users/inviteuser',
  headers: { 
    'X-API-KEY': 'gsid=s%3ADbdXXXXXXXXXXXXXXXXXXXXXXYI5y3kNGxyXcVQqFdHR%2FmAdCh1cM4j1JtcEANILrV2w;', 
    'X-ORGANIZATION-ID': '449', 
    'Content-Type': 'application/x-www-form-urlencoded'
  },
  data : data
};

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