getting empty array in response res.json(); in nodejs code - node.js

Question

Why does res.json respond with an empty array?
I want to get all data from collection distributor ,so for that I have
created model file and then assigned it to on variable Distributordata
Server file : app.js
var express=require('express');
var app=express();
var bodyParser=require('body-parser');
var mongoose=require('mongoose');
var Distributordata=require('./distributor.model');
var db='mongodb://localhost/Distributordata';
mongoose.connect(db);
var port=8080;
app.get('/',function(req,res){
res.send("happy to be here");
});
app.get('/distributor',function(req,res){
// res.send("hi from distributors")
console.log("getting all distributors");
Distributordata.find(function(err,distributordata){
if(err){
res.send("error has occured");
}
else{
console.log(distributordata);
res.send(distributordata);
}
});
});
app.listen(port,function(){
console.log('app listening on port'+port);
});
Model file : distributor.model.js
var mongoose=require('mongoose');
var Schema = mongoose.Schema;
var DistributorSchema=new Schema({
dname:String,
daddress: String
});
module.exports=mongoose.model('Distributordata',DistributorSchema);
output
on cmd:
app listening on port8080
getting all distributors
[ ]

Answer 1

So far I've understood your problem is you are creating your collection in mongodb by yourself as the collection name distributor. And also as you are not sending any post request so your code will not create any collection automatically in the main database.
But, by default mongoose always creates a collection name by pluralizing the name of the model, in your case this collection name would be distributordatas. But when, you are trying to get the data from your database, it's getting the collection name as distributor for this reason it becomes unable to make a connection. But you can keep this using force naming convention for collection as like you want.
In your distributor.model.js file change this line of code to this one:
module.exports = mongoose.model('Distributordata', DistributorSchema, 'distributor');
Hopefully, it'll solve your problem. For more reference check this out https://mongoosejs.com/docs/guide.html#collection