连接 ECONNREFUSED 127.0.0.1:27017'

Question

I have that code:

var express = require('express'),
    stylus = require('stylus'),
    logger = require('morgan'),
    bodyParser = require('body-parser'),
    mongoose = require('mongoose');

var env = process.env.NODE_ENV = process.env.NODE_ENV || 'development';

var app = express();

function compile(str, path){
    return stylus(str).set('filename', path);
}

app.set('views', __dirname + '/server/views');
app.set('view engine', 'jade');
app.use(logger('dev'));
app.use(bodyParser.urlencoded({ extended: true }));
app.use(stylus.middleware(
        {
            src: __dirname + '/public',
            compile: compile
        }
    ));
app.use(express.static(__dirname + '/public'));

mongoose.connect('mongodb://localhost/multivision');
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error..'));
db.once('open', function callback(){
    console.log('multivision db opened');
});

app.get('/partials/:partialPath', function(req, res){
    res.render('partials/' + req.params.partialPath);
});

app.get('*', function(req, res) {
  res.render('index');
});

var port = 3131;
app.listen(port);
console.log('Listening on port ' + port + '...');

but when I'm trying nodemon server.js it throws an error:

connection error.. { [MongoError: connect ECONNREFUSED 127.0.0.1:27017] name: 'MongoError' message: 'connect ECONNREFUSED 127.0.0.1:27017' }

how can I improve that? I've already installed mongoose using npm install mongoose --save in my directory

Yeah there are dozens question like this but none of these helped me.. I'm new at nodejs and probably missing something

Answer 1

I was also facing the same issue, when I was executing node server on my project directory. For me the MongoDB service was not started, that makes this issue.

So I had to run services.msc and activated the service.

After that I was able to run my command.

D:\SVenu\MyApp>node server
Saving User
App is listening on port: 3000
Already Exist
Already Exist
Already Exist
Already Exist
Done save

Answer 2

run services.msc and activate the Mongodb service.

Now Mongodb will connect

the status of the Mongodb indicated as Running

Answer 3

Your mongodb service is probably down. Run sudo service mongod start to start the daemon process

Answer 4

I was having the same problem, and found that it was a mongod issue.(I am running Ubuntu 16.04). Looking through the errors there was a directory missing. After adding the directory, I needed to change permissions, and finally, set the mongod service to start at boot.

$ sudo mkdir -p /data/db
$ sudo chown -R $USER /data/db
$ sudo systemctl enable mongod.service

Answer 5

I know this issue is old, but i came across a similar issue and the above solutions did not work for me, I'm using Ubuntu 20.04 LTS.

What i did to make it work was just running mongo service using this command:

$ mongod

Then everything worked fine

Answer 6

如果您在 Windows 中并且遇到此问题，只需转到 mongodb 的安装程序 exe 应用程序，然后单击“修复”这对我有用

Answer 7

try this:

mongod.exe --dbpath c:\data\db

c:\data\db is the place where you put your db.

and when you see something like this :

2016-08-18T10:22:31.020+0800 I CONTROL  [main] Hotfix KB2731284 or later update is not installed, will zero-out data files
2016-08-18T10:22:31.022+0800 I CONTROL  [initandlisten] MongoDB starting : pid=4356 port=27017 dbpath=c:\data\db 64-bit host=sevencai-PC0
2016-08-18T10:22:31.022+0800 I CONTROL  [initandlisten] targetMinOS: Windows 7/Windows Server 2008 R2
2016-08-18T10:22:31.023+0800 I CONTROL  [initandlisten] db version v3.2.8
2016-08-18T10:22:31.023+0800 I CONTROL  [initandlisten] git version: ed70e33130c977bda0024c125b56d159573dbaf0

......

and then node yourserver.js

maybe everything will be fine!

Answer 8

Follow as below:

=> run services.msc and start mondodb server

and save the file in node project, you can see the server connected!!

Answer 9

here is the problem:

mongoose.connect('mongodb://localhost/multivision') 

The default port for mongodb and mongos instances is 27017.

mongoose.connect('mongodb://localhost:27017/multivision') 

also make sure that mongod is running so u can communicate with the mongodb

Answer 10

In Most of the case you will get the error bcz the service MongoDB Database Server (MongoDB) Might be stopped.

Just start the service to be connected with DB

Answer 11

it's doesn't work as localhost but IP address works 127.0.0.1 and solves this problem:

  // .connect("mongodb://localhost:27017/lofydb")

    const mongoose = require("mongoose");

    mongoose.connect("mongodb://127.0.0.1:27017/lofydb")
      // .connect("mongodb://127.0.0.1:27017")
    
      .then(() => {
        console.log("Connected to Database");
      })
      .catch((err) => {
        console.log("Not Connected to Database ERROR! ", err);
      });

Answer 12

1. please check the MongoDB service is active and running. Refer the running services

2. If it is running and available on MongoDB compass or on MongoDB shell and if you are working with node version >17.0.0 or so it will give error. So plz change to the stable version of node.

Answer 13

Make sure MongdoDB is running

To run MongoDB as a macOS service, run:

brew services start mongodb-community@5.0

And when you see:

==> Successfully started mongodb-community (label: homebrew.mxcl.mongodb-commu

OR type on command line, to check the mongo service.

mongod

After run service, You can easily connect with mongdoDB localhost or remote connection.

Answer 14

I had the same issue and it had to do with the fact that my MongoDB service wasn't running locally. Make sure you followed all the correct installation steps for whatever OS you are trying to run MongoDB service here: https://www.mongodb.com/docs/manual/administration/install-community/

Then follow the respective guide for the running the service under "Run MongoDB Community Edition". So for example, for macOS you would do

brew services start mongodb-community@6.0

if you wanted to run as a macOS service, or

mongod --config /opt/homebrew/etc/mongod.conf --fork

if you wanted to run manually as a background service on Apple M1 processor. The same page I shared above also has commands you can run for verifying if your MongoDB process is running.

Answer 15

Step 1: open conf file to edit.

sudo vim /etc/mongod.conf

Step 2: find port and change it.

net: port: 27017 -> default port before any change

After changing port, my issue solved: