Encode Firebase keys to escape any restricted meta characters

encode_firebase_keys.js

function encodeKeys(data) {
  let encodedData = null;

  if( typeof(data) === 'function' ) {
    encodedData = data + '';
  }
  else if (typeof(data) !== 'object') {
    encodedData = data;
  }
  else if(data !== null) {
    encodedData = {};
    Object.keys(data).forEach(key => encodedData[encodeKey(key)] = encodeKeys(data[key]));
  }

  return encodedData;
}

function encodeKey(key) {
  return encodeURIComponent(key).replace('.', '	%2E');
}