Can not get the array of data using Node.js and MongoDB - arrays

Question

I am trying to fetch data from mongoDB and store those in array format bot outside of callback function I am getting that array variable as blank using Node.js.
My code is below:
exports.getCardDetails=function(req,res){
var userid=req.body.userid;
var token_id=req.body.token_id;
var userData=[];
db.f_user_login.find({_id: mongoJs.ObjectId(userid),token:token_id},function(err,doc){
if (doc.length > 0) {
db.f_card_details.find({userid:userid},function(errs,docs){
if (!errs) {
if (docs) {
for (var i = 0;i< docs.length;i++) {
var oemail=docs[i].email;
var id=docs[i]._id;
var name=docs[i].name;
var company=docs[i].company;
var position=docs[i].position;
var mobile=docs[i].mobile;
var landline=docs[i].landline;
var url=docs[i].url;
var postcode=docs[i].postcode;
var address=docs[i].address;
var isCurrentUser=docs[i].isCurrentUser;
db.f_user_profile.find({email:oemail},function(errs1,docs1){
if (!errs1) {
if (docs1) {
for(var j=0;j < docs1.length;j++){
var profileText=docs1[j].profiletext;
var biography=docs1[j].biography;
var image=docs1[j].file;
var profileid=docs1[j]._id;
}
var data={"id":id,"name":name,"company":company,"position":position,"mobile":mobile,"email":oemail,"landline":landline,"url":url,"postcode":postcode,"address":address,"profileText":profileText,"biography":biography,"image":image,"isCurrentUser":isCurrentUser,"profile_id":profileid};
userData.push(data);
}
}
})
}
console.log('user',userData);
var sdata={"statusCode": 200,"data":userData ,"message": "Your card details has been fetched successfully"};
res.send(sdata);
}
}
})
}else{
var data={"statusCode": 404,"error": "Not Found","message":"Invalid User"};
res.send(data);
}
})
}
Here I am pushing all data into userData array and trying to send those as response but here my problem is inside the loop all data are pushing to that array but console.log('user',userData); is showing blank while sending those data as response. I need to send those data as response.

Answer 1

userData is filled in db.f_user_profile.find callback, that's where you should move res.send(sdata); as well. Also I suggest to convert to async/await if you are using node7:
exports.getCardDetails = async function(req,res){
var userid=req.body.userid;
var token_id=req.body.token_id;
var userData=[];
const user = await db.f_user_login.find({_id: mongoJs.ObjectId(userid),token:token_id}).next();
if(user) {
const cards = await db.f_card_details.find({userid:userid}).toArray();
for (var i = 0;i < cards.length;i++) {
var email=docs[i].email;
var id=docs[i]._id;
var name=docs[i].name;
var company=docs[i].company;
var position=docs[i].position;
var mobile=docs[i].mobile;
var landline=docs[i].landline;
var url=docs[i].url;
var postcode=docs[i].postcode;
var address=docs[i].address;
var isCurrentUser=docs[i].isCurrentUser;
const profiles = await db.f_user_profile.find({email}).toArray();
for(var j=0; j < profiles.length;j++) {
var profileText=docs1[j].profiletext;
var biography=docs1[j].biography;
var image=docs1[j].file;
var profile_id=docs1[j]._id;
var data={id,name,company,position,mobile,email,landline,url,postcode,address,profileText,biography,image,isCurrentUser,profileid};
userData.push(data)
}
}
console.log('user',userData);
var sdata={"statusCode": 200,"data":userData ,"message": "Your card details has been fetched successfully"};
res.send(sdata);
} else {
var data={"statusCode": 404,"error": "Not Found","message":"Invalid User"};
res.send(data);
}
}