如何计算不。 Node.Js在MongoDB集合中收集文档？

Question

i have data in MongoDB and i want to return document count based on user input.But every time i am getting Count:0 even though i have document present in database matched to user input.

Below is my code kindly correct me what i am doing wrong:

 const express = require('express');
 const bodyParser = require('body-parser');
 const mongoClient = require("mongodb").mongoClient;

 var app = express();
 var port = process.env.PORT || 3000;
 var url = "http://localhost:3000/";

 app.use(bodyParser.json());
 app.use(bodyParser.urlencoded({extended:true}));

 app.post('/finish',(req,res) =>{

 mongoClient.connect(url,(err,db) => {

           if(err){
              console.log("Error:" +err);
            }

          else{

             var obj = {Name:req.body.name};

             var collect = db.db("Tiffino").collection("Users"); 

             var cnt = collect.find({Name:obj}).count.then((count)=>{

                   console.log("Count:" +count);
               }); 

            }
    }); 

 });

  app.listen(port,(req,res) => {

        console.log("App is running at:" +port);
   });

OUTPUT Count:0

Answer 1

What you are doing is mixing 2 different commands collect.find({Name:obj}) and collect.count() . First command returns the array of documents based on your query, while the second one gives you the total count of documents in that particular collection and not the count of your queried documents. What you are aiming can simply be achieved by:

 collect.find({Name:obj}).then((docs)=>{ console.log("Count:" docs.length); });