MongooseError: Operation `domains.insertOne()` buffering timed out after 10000ms - node.js

Question

I understand that we need to use asynch and await while connecting db since models are loading before db connection happening so i have used and call the function in server.js Please look into my code and help me.
Connection.js
const mongoose = require('mongoose');
mongoose.set('strictQuery', true);
module.exports = async () => {
console.log(process.env.DB_URL);
await mongoose.connect(process.env.DB_URL, {
useNewUrlParser: true,
//useUnifiedTopology: true
}).then(()=>{
console.log("Database Connected");
}).catch (error => {
console.log("Database connectivity Error", error);
});
}
Server.js
const express = require('express');
const dotEnv = require('dotenv');
const { urlencoded } = require('express');
const cors = require('cors');
const dbConnection = require('./database/connection');
dotEnv.config({path:'./.env'});
const app = express();
// Database connection
// cors
app.use(cors());
app.use(express.json());
dbConnection();
app.use('/api/v1/domain', require('./routes/domainRoutes') );
app.get('/', (req, res, next)=>{
res.send("Hello From node aPI server");
});
// request payload middleware
app.use(express.json);
app.use(urlencoded({extended:true}))
const PORT = process.env.PORT || 3000;
app.listen(PORT, ()=>{
console.log(`Server Listen on port ${PORT}`);
});
// error handling middle ware
app.use(function(err, req, res,next){
console.error(err.stack)
res.status(500).send({
status: 500,
message:err.message,
body:{}
})
});
DomainService.js
const Domain = require('../database/models/DomainModel');
module.exports.createDomain = async (serviceData) => {
try {
let domain = new Domain({...serviceData})
return await domain.save();
} catch (error) {
console.log("Soemthing wrong: Service : Create Domain ", error);
throw new Error(error);
}
}
you can find full code here
https://github.com/vlpreddy/node-express-rest-api
I am trying to develop rest api's using nodeJs, tried to connect with mongoddb using mongoose. I am getting this timeout error since 2 days, i tried most of the solutions in the internet including using await and async.
So can someone please look into my code and help me.

Answer 1

Since I was stupid enough, I haven't installed mongodb in my system, so it was not connecting obviously. But I felt like it suppose to throw an error like
dude there is no mongodb in your system, how the heck do you think you
can create database and store the collections.
Any how people who are coming here with same error but a different reason can utilise following code and connect database using async and await functions as new version can load models with out even caring whether database is connected or not.
**database/connection.js**
const mongoose = require('mongoose');
mongoose.set('strictQuery', true);
module.exports = async () => {
//console.log(DB_URL);
await mongoose.connect(process.env.DB_URL, {
useNewUrlParser: true,
useUnifiedTopology: true
}).then(()=>{
console.log("Database Connected");
}).catch (error => {
console.log("Database connectivity Error", error);
});
}
you can import in any page and call the variable as a function
since it returns a promise function which is written below.
const dbConnection = require('./database/connection');
dbConnection();