Connect multiple mongo db database in node js using mongoose

Question

I am using mongoose for mongo db connections in node js. Can anyone tell me how can I connect multiple databases in node js. Also please make sure that you have tried that method yourself. Thanks.

Edit: I want to connect to multiple DBs dynamically. Also I don't want multiple models and I have just one project, not various sub-projects.

Answer 1

i believe you are connecting to mongoDB from main entrypoint as index.js or server.js , where you are initiating router. like this `

    const mongoose = require('mongoose')
    // mongoose
    mongoose.connect("mongoDB url");
    const connection = mongoose.connection;
    connection.on('open',()=>{
        console.log(" database connected")
    })
    connection.on('error',()=>{
        console.log("error in connecting to database")
    })
    app.use(morgan('dev'));
    app.use(bodyParser.urlencoded({extended: false}));
    app.use(bodyParser.json());
    //middlewares`

in same way you can also connect to different databases directly schemas. like in my use case , i wanted to store users in defferent database and posts in another DB . the in my app.js , i will connect to main DB as normal connection (above) and for user schema , i will connect to my user DB . like this

    const mongoose = require('mongoose');
    const connection = mongoose.createConnection("mongo url ");
    const userSchema = mongoose.Schema({
       name: String,
       date_of_birth: Date
      })
    module.exports = mongoose.model('User', userSchema);

you can also use mongoose.connect() instead of mongoose.createConnection()

hope this helped you.