text: const env = process.env.NODE_ENV || 'development';
  
  if( env === 'development'){
      let config = require('./config.json');
      const env_config = config[env];
      Object.keys(env_config).forEach((key) => {
          process.env[key] = env_config[key];
      });
  }
  
  console.log('env *****', env);