Load a local json in your Cordova app

loadjson.js

Add to app .plst

<key>NSAppTransportSecurity</key>  
<dict>  
<key>NSAllowsArbitraryLoads</key>  
<true/>  
</dict> 

var getJSON = function(url) {
  return new Promise(function(resolve, reject) {
    var xhr = new XMLHttpRequest();
    xhr.open('get', url, true);
    xhr.responseType = 'json';
    xhr.onload = function() {
      var status = xhr.status;
      if (status == 200 || status == 0) {
        resolve(xhr.response);
      } else {
        reject(status);
      }
    };
    xhr.send();
  });
};

loadData = function (callbackFN) {
  getJSON('assets/data.json').then(function(data) {
    callbackFN(data);
  }, function(status) {
    console.log('Something went wrong.');
  });
}