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

Question

I\'m new in nodeJS, started learning by following a trailer on youtube, everything goes well until I added the connect function if mongodb,

mongo.connect(\"m         


        

Answer 1

If the mongoDB server is already installed and if you are unable to connect from a remote host then follow the below steps,

Login to your machine, open mongodb configuration file located at /etc/mongod.conf and change the bindIp field to specific ip / 0.0.0.0 , after that restart mongodb server.

    sudo vi /etc/mongod.conf

• The file should contain the following kind of content:

    systemLog:
        destination: file
        path: "/var/log/mongodb/mongod.log"
        logAppend: true
    storage:
        journal:
            enabled: true
    processManagement:
        fork: true
    net:
        bindIp: 127.0.0.1  // change here to 0.0.0.0
        port: 27017
    setParameter:
        enableLocalhostAuthBypass: false
  

• Once you change the bindIp, then you have to restart the mongodb, using the following command

    sudo service mongod restart
  

• Now you'll be able to connect to the mongodb server, from remote server.

Answer 2

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

Better just connect to the localhost Mongoose Database only and create your own collections. Don't forget to mention the port number. (Default: 27017)

For the best view, download Mongoose-compass for MongoDB UI.

Answer 3

just install MongoDB on your system. That's it.

Answer 4

My problem was the wrong port number for mongoDB server.

I had:

DATABASE_URL= "mongodb://localhost:3000/node-express-mongodb-server"

in my .env file (my environmental variables), but I had written it before running mongoDB server. So when I ran the mongoDB server, it wrote a different port number and I had to change it. I changed it to the right port number (which was written on my cmd window by mongoDB):

DATABASE_URL= "mongodb://localhost:27017/node-express-mongodb-server"

and now it works fine.

Answer 5

This had occurred to me and I have found out that it was because of faulty internet connection. If I use the public wifi at my place, which blocks various websites for security reasons, Mongo refuses to connect. But if I were to use my own mobile data, I can connect to the database.

Answer 6

You can check detail of error by running this command

sudo service mongod status

if error is something like this

• Failed to unlink socket file /tmp/mongodb-27017.sock Unknown error
• Fatal Assertion 40486 at src/mongo/transport/transport_layer_asio.cpp 670

simply running this will resolve your issue

rm /tmp/mongodb-27017.sock