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var request = {
    type: 'getSobjectSchema',
    object: 'Account', // Required: SObject unique name 
    data: { } // empty     
};
bridge.sendRequest(request, function (result) {
   if (result.type === 'sobjectschemaResponse') { // case-sensitive
      var describeLayoutJSONdescribeSObjectJSON = result.data; // you must parse this JSON string 
      var describeLayoutdescribeSObject = JSON.parse(describeLayoutJSONdescribeSObjectJSON); 
      //....
   }
   else {
      console.log('error: '+ result.data)
   }
});