fromJson method
Implementation
void fromJson(Map<String, dynamic> json) {
apiKey = json['apiKey'] ?? '';
authDomain = json['authDomain'] ?? '';
databaseURL = json['databaseURL'] ?? '';
projectId = json['projectId'] ?? '';
storageBucket = json['storageBucket'] ?? '';
messagingSenderId = json['messagingSenderId'] ?? '';
appId = json['appId'] ?? '';
}