node.js - How do I troubleshoot freebusy google calendar nodejs api? -

i trying free-busy information google calendar using nodejs api listed here https://developers.google.com/google-apps/calendar/v3/reference/freebusy/query. problem error response 'invalid request'. when run google's try tool, able response though. know getting authorized client. can troubleshoot further?

function getavail(auth, datetimerange, calid) {     var deferred = q.defer(); // new deferral     calendar.freebusy.query({             auth: auth,             items: [{id: calid}],             timemin: (datetimerange.start).toisostring(),             timemax: (datetimerange.end).toisostring(),             }, function(err, response) {                     console.log('response calendar service: ' + response);                     if (err) {                             console.log('there error contacting calendar service: ' + err);                             deferred.reject(); // deferred reject here                             return;                     }                        var events = response[calid]['busy'];                     if (events.length == 0) {                             console.log('no upcoming events found.');                     } else {                             console.log('busy in here...');                     }                        deferred.resolve(response); // deferred resolve here             });      return deferred.promise; // return promise 

}

phew! figured out doing wrong. here code works comments making mistake. wish there better way finding out issue.

function getavail(auth, datetimerange, calid) {     console.log('auth:'+json.stringify(auth));     console.log('date time range :'+(datetimerange.start).toisostring()+' --->'+(datetimerange.end).toisostring());     console.log('calendar id check freebusy:'+calid);     var deferred = q.defer(); // new deferral     calendar.freebusy.query({             auth: auth,             headers: { "content-type" : "application/json" },             resource:{items: [{"id" : calid}],   //needed include resource instead of sending params directly.                        timemin: (datetimerange.start).toisostring(),                       timemax: (datetimerange.end).toisostring()                     }        }, function(err, response) {                     console.log('response calendar service: ' + json.stringify(response));                     if (err) {                             console.log('there error contacting calendar service: ' + err);                             deferred.reject(); // deferred reject here                             return;                     }                        var events = response.calendars[calid].busy;                     if (events.length == 0) {                             console.log('no upcoming events found.');                     } else {                             console.log('busy in here...');                     }                        deferred.resolve(response); // deferred resolve here             });      return deferred.promise; // return promise } 

it lot of meditation , staring @ documentation closely. google's nodejs library not particularly well-documented examples yet (well, still alpha). here function freebusy: this.freebusy = {

/**  * calendar.freebusy.query  *  * @desc returns free/busy information set of calendars.  *  * @alias calendar.freebusy.query  * @memberof! calendar(v3)  *  * @param  {object} params - parameters request  * @param  {object} params.resource - request body data** <<<< -- missing.  * @param  {callback} callback - callback handles response.  * @return {object} request object  */ query: function(params, callback) {   var parameters = {     options: {       url: 'https://www.googleapis.com/calendar/v3/freebusy',       method: 'post'     },     params: params,     requiredparams: [],     pathparams: [],     context: self   };    return createapirequest(parameters, callback); }  }; 

there additional learns creating closures inside loops learned on here: javascript closure inside loops – simple practical example. let me know if else runs similar issues. happy share code samples.