connection to mongoDB

Question

I am a new in nodeJS and mongodb. I can not connect my code with mongodb. here is my code. when I run this code it gives me this,

(node:9160) DeprecationWarning: current URL string parser is deprecated, and will be removed in a future version. To use the new parser, pass option { useNewUrlParser: true } to MongoClient.connect .

How can I fix it?

var express = require("express");
    var mongoose = require("mongoose");
    var passport = require("passport");
    var bodyParser = require("body-parser");
    var LocalStrategy = require("passport-local");
    var passportLocalMongoose = require("passport-local-mongoose");

    mongoose.connect("mongodb://localhost/mydb");

    // mongoose.connect("mongodb://localhost:27017/mydb_login", { useNewUrlParser: true })
    var app = express();

    app.set("view engine", "ejs");

Answer 1

Try it, I think it will help you.

let MONGOOSE = require('mongoose');    
MONGOOSE.connect('mongodb://127.0.0.1:27017/demo', (err, response)=>{
                if(err)
                    reject(err);
                else
                    resolve(null);
            });    

Answer 2

I would recommend to replace this statement of yours

mongoose.connect("mongodb://localhost/mydb");

with a one of this type:

mongoose.connect(uri)
.then(
    () => { 
      console.log("Connected");
    },
    err => {
      console.log(err); 
    }
);

This will help you to know wether the connection has been established or not and also if it is not established what is the corresponding error for the same.

Answer 3

just add {useNewUrlParser: true} to the connection options object

mongoose.connect("mongodb://localhost/mydb", { useNewUrlParser: true });

this is due to a new parser version

Answer 4

Put this code inside your layout file, not in app.js:

var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/yourDatabase', { useNewUrlParser: true });
var Schema = mongoose.Schema;

Then you can create your Schema layout, for example:

var mySchema = new Schema({
    first_name: String, 
    last_name: String
});

Answer 5

100% Work Method just Follow Me

1. find The mongoose.connect(db) file in your project.... its could be found in Custom folder or server.js
2. In mongoose.connect(db) replace mongoose.connect(db,{ useNewUrlParser: true })
3. See image