[node.js] MongoError: connect ECONNREFUSED 127.0.0.1:27017

I'm using NodeJS wih MongoDB using mongodb package. When I run mongod command it works fine and gives "waiting for connection on port 27017". So, mongod seems to be working. But MongoClient does not work and gives error when I run node index.js command-

MongoError: failed to connect to server [localhost:27017] on first connect [MongoError: connect ECONNREFUSED 127.0.0.1:27017]

I have install mongo db 3.4 and my code is-

var MongoClient = require('mongodb').MongoClient;
var dburl       =   "mongodb://localhost:27017/test";
MongoClient.connect(dburl, function(err, db) {
  if (err) {
    throw err;
  }
  console.log('db connected');
  db.close();
});

I have created data/db directories on root and given write permissions. mongod.conf file takes db path as-

storage: dbPath: /var/lib/mongo

But it seems that it is actually taking db path as data/db and not var/lib/mongo

It working earlier but suddenly stopped.

If you are a windows user, right click on Start and open Windows Powershell(Run as administartor). Then type

mongod

That's it. Your database will surely get connected!

For Windows users.

This happens because the MondgDB server is stopped. to fix this you can,

1. 1 search for Services ,for that search using the left bottom corner search option.

   2 then there is a gear icon named with 'Services'.

   3 after clicking that you will get a window with lot of services

   4 scroll down and you will find 'MongoDB server (MongoDB)'.

   5 so you will see that there is an option to start the service.

   6 start it.

2. 1 then open your command prompt.

   2 type mongod

now you can connect to your server.

this steps also working fine if your sql server service down. (find sql server services)

On a mac I had to run brew services start [email protected]

Check: Install MongoDB Community Edition on macOS

For windows - just go to Mongodb folder (ex : C:\ProgramFiles\MongoDB\Server\3.4\bin) and open cmd in the folder and type "mongod.exe --dbpath c:\data\db"

if c:\data\db folder doesn't exist then create it by yourself and run above command again.

All should work fine by now.))

just start the mongo server from terminal

Ubuntu -

     sudo systemctl start mongod

because you didn't start mongod process before you try starting mongo shell.

Start mongod server

mongod

Open another terminal window

Start mongo shell

mongo

Try to start mongoDB server by giving the --dbpath with mongod.

sudo mongod --dbpath /var/lib/mongo/data/db &

'&' in the last will start the mongodb server as service on your server.

Hope it Works.

I've forgot to start MongoDB at all. Go to separate tab in terminal and type:

sudo service mongod start

The solution was to install MongoDB from below location: https://www.mongodb.com/download-center/community

Please ensure that your mongo DB is set Automatic and running at Control Panel/Administrative Tools/Services like below. That way you wont have to start mongod.exe manually each time.

For Windows users: Mongo version 4.4 Use following commands: NET STOP MONGODB – To stop MongoDB as a service,if this returns "mongoDb service is not running then use below command to start service" NET START MONGODB – To start MongoDB as a service.

This worked for me.

most probably your mongo db service is not started. For ubuntu : sudo service mongod start For windows : go to services and start the MongoDB service

also install link for mondoDB service https://www.mongodb.com/download-center/community

I had this problem and i solved it thanks to this man's answer https://stackoverflow.com/a/47433551/7917608

I had the same error because i had not installed mongoDB. Make sure that you have mongodb installed and if not, you can download it from here https://www.mongodb.com/download-center/community

I had below error:

Error: connect ECONNREFUSED 127.0.0.1:27017

In my case, this issue occurred since MongoDB is not installed at all.

The solution was to install MongoDB from below location:
https://www.mongodb.com/download-center/community

After installing the ECONNREFUSED error did not appear again.

Hope that helps.

You probably need to continue running your DB process (by running mongod) while running your node server.

If you already installed "MongoDB", if you accidentally exit from the MongoDB server, then "restart your system".

This method solved me...

[On Windows only]

And also another method is there:

press:

Windows + R

type:

services.msc

and click "ok", it opens "services" window, and then search for "MongoDB Server" in the list. After you find "MongoDB Server", right-click and choose "start" from the pop-up menu.

The MongoDb Server will start running.

Hope it works!!

In my particular instance, I was connected to a VPN and that was blocking the localhost connection to MongoDB somehow. It worked when I disconnected my VPN. It's a special case, but good to know nonetheless. So anything impeding your network connectivity, Get that fixed.

This happened probably because the MongoDB service isn't started. Follow the below steps to start it:

1. Go to Control Panel and click on Administrative Tools.
2. Double click on Services. A new window opens up.
3. Search MongoDB.exe. Right click on it and select Start.

The server will start. Now execute npm start again and the code might work this time.

I had the same issue on Windows.

Ctrl+C to close mongod, and start mongod again.

Am not sure, but it seems that initially mongod was working opening and closing connections. Then, it was not able to close some earlier connections and reached limit for opened ones. After restarting mongod, it works again.

For Ubuntu users run sudo systemctl restart mongod

I was having the same problem today.. and has been searching for answers.. I am on Ubuntu... however, I could not find the correct one that works on this thread.. after much research the following worked for me finally!! :)

First, after running

mongod dbpath

if appeared that mongodb was looking for the data/db directory.. which was missing in my installed mongodb app.. so I ran the following commands:

$ sudo mkdir -p /data/db

then run,

$ sudo chown -R $USER /data/db

chown - changes ownership of files/dirs. Ie. owner of the file/dir changes to the specified one, but it doesn't modify permissions. As detailed here: https://unix.stackexchange.com/questions/402062/how-are-chown-and-chmod-command-different-in-the-given-operation

Finally, run

`$ sudo systemctl enable mongod.service

It will give a message: Created symlink /etc/systemd/system/multi-user.target.wants/mongod.service ? /lib/systemd/system/mongod.service and started the service.

Press CTRL+ALT+DELETE/task manager , then go to services , find MongoDB , right click on it. start. go back to terminal . npm start it will work.

I was facing the same issue on windows 10. I just uninstall MongoDB and installed it again and it started working. It solved my problem.