JSON String appears to be blank in node js - node.js

Question

I am trying to create web services using node js,express and mongoose.
this is my app.js file
var express = require('express');
var app = express();
var bodyParser = require('body-parser');
var mongoose = require('mongoose');
GetData = require('./models/women');
mongoose.connect('mongodb://localhost/shopping');
var db = mongoose.connection;
app.get('/api/getCategories',function(req,res){
GetData.getCategory(function(err,getCategory){
if (err) {
throw err;
}
res.json(getCategory);
});
});
app.get('/',function(req,res){
res.send('Hi i am Madhura. Nice to Meet u. lets start creating web services');
});
app.listen(3000);
console.log('connected to Port 3000');
this is my women.js file
var mongoose = require('mongoose');
var categorySchema = mongoose.Schema({
name:{
type: String,
required: true
}
});
var Category = module.exports = mongoose.model('',categorySchema);
module.exports.getCategory = function(callback,limit){
Category.find(callback).limit(limit);
}
I am unable to understand this line
var Category = module.exports = mongoose.model('',categorySchema);
I have left this ' ' blank because I wanted to know what parameter is passed here
I watched a video about this, and could not find a conclusion. however, I simply followed the video and run the code. but my output is coming to be a null JSONArray "[]". Please tell me what am i doing wrong.

Answer 1

var mongoose = require('mongoose');
var categorySchema = mongoose.Schema({
name:{
type: String,
required: true
}
});
var Category = mongoose.model('Category',categorySchema);
module.exports.getCategory = function(callback,limit){
Category.find(callback).limit(limit);
}
The part you have made '' contains the mongoose model name that you can use to refer the respective MongoDB collection. you can imagine a model name as replacement of db.collectionname for MongoDB. I have updated the codebase