Troubleshooting problems with connecting Express JS and MongoDB

I've written a simple code to connect express js to mongodb, and I've installed both packages. However, I'm encountering an error. Can someone help me troubleshoot this?

const express = require("express");
const app = express();

app.listen(3000,() => {
    console.log("Server is running at port number 3000");
})

const mongoose = require("mongoose");

mongoose.connect("mongodb://localhost:27017/myDatabase",{
    useNewUrlParser:true,
    useUnifiedTopology:true
})
.then(() => {console.log("Connection is Succeed")})
.catch((e) => { console.error("Received an Error", e); });

The error I'm facing is that they are not connecting properly.

Server is running at port number 3000
(node:25888) [MONGODB DRIVER] Warning: useNewUrlParser is a deprecated option: useNewUrlParser has no effect since Node.js Driver version 4.0.0 and will be removed in the next major version       
(Use `node --trace-warnings ...` to show where the warning was created)
(node:25888) [MONGODB DRIVER] Warning: useUnifiedTopology is a deprecated option: useUnifiedTopology has no effect since Node.js Driver version 4.0.0 and will be removed in the next major version 
Received an Error MongooseServerSelectionError: connect ECONNREFUSED ::1:27017
    at _handleConnectionErrors (C:\Users\ASUS\OneDrive\Desktop\web dev\Backend Development\Express and MongoDB connections\node_modules\mongoose\lib\connection.js:809:11)
    at NativeConnection.openUri (C:\Users\ASUS\OneDrive\Desktop\web dev\Backend Development\Express and MongoDB connections\node_modules\mongoose\lib\connection.js:784:11) {
  reason: TopologyDescription {
    type: 'Unknown',
    servers: Map(1) { 'localhost:27017' => [ServerDescription] },
    stale: false,
    compatible: true,
    heartbeatFrequencyMS: 10000,
    localThresholdMS: 15,
    setName: null,
    maxElectionId: null,
    maxSetVersion: null,
    commonWireVersion: 0,
    logicalSessionTimeoutMinutes: null
  },
  code: undefined
}
javascriptmongodbexpressmongoose

Answer №1

I encountered a similar issue but found a solution. Simply switch out localhost with 127.0.0.1. So your modified code will look like this:


mongoose.connect("mongodb://localhost:27017/myDatabase",{
    useNewUrlParser:true,
    useUnifiedTopology:true
})

transformed to:


mongoose.connect("mongodb://127.0.0.1:27017/myDatabase",{
    useNewUrlParser:true,
    useUnifiedTopology:true
})

Answer №2

Give this code a shot instead of the usual 'mongodb://localhost:27017/myDatabase'

const express = require("express");
const mongoose = require("mongoose");
const app = express();

app.listen(3000,() => {
    console.log("The server is now up and running on port 3000");
})


mongoose.connect("mongodb://127.0.0.1:27017/myDatabase",{
    useNewUrlParser:true,
    useUnifiedTopology:true
})
.then(()=>{console.log("Connection successful")})
.catch((e)=>{console.log("An error occurred")});

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