Here is the code that i'm struggle with.

GetreportSchedule : function(req, res){
               var query = db.query("Select * from trainStops", function (err, result) {
                if (err) {
                    console.log(req.body);
                 } else {
                 var objs = [];
                 for (var i = 0;i < result.length; i++) {
                        objs.push({"id": result[i].s_Id,"name":result[i].name,"arr":result[i].arr,"dept":result[i].dept});
                  }
            
                   var arrayX = JSON.stringify(objs);
            
                    var data = {
                          template:{"shortid":'BynN_cl0l'},
                          data:{"trainStops":arrayX}
                     }
                     var options = {
                           uri:'http://localhost:8001/api/report',
                           method:'POST',
                           json:data
                     }
                     request(options).pipe(res);  
        }
    });
},

When i replace arrayX with its output, pdf works fine. But when i use arrayX (as above example) i'll get an empty pdf.
Can someone please tell me what I did wrong?

i call JSON.stringify(objs) to create the json object as what i needed according to the report. And Yes! report is working fine in html recipe.
However "json:true, body: data" didn't work out.

for more clarity:

when i wrote below line manually report working perfectly.
data: {"trainStops":[{"id":"3007","name":"Colombo Fort","arr":"07:05","dept":"07:06"},{"id":"3008","name":"Airport","arr":"07:00","dept":"07:01"}] }

console.log(arrayX) gives below output:
[{"id":"3007","name":"Colombo Fort","arr":"07:05","dept":"07:06"},{"id":"3008","name":"Airport","arr":"07:00","dept":"07:01"}]

but when i'm using below code report shows as an empty page.
data: {"trainStops": arrayX }

My English is not so good, sorry for that and hope you understood my problem anyway. :D