How to get mongodb version from mongoose

Question

Simple, with the mongo cli:

db.version ()

How can I do the same with mongoose? How can I send a custom command?

Answer 1

Try this one, it will give you the verion of both MongoDB and Mongoose

async function run() {
    var admin = new mongoose.mongo.Admin(mongoose.connection.db);
    admin.buildInfo(function (err, info) {
       console.log(`mongodb: ${info.version}`);
       console.log(`mongoose: ${mongoose.version}`);
    });
}

mongoose.connect(process.env.MONGO_URI, {
        useNewUrlParser: true,
        useUnifiedTopology: true
    })
    .then(() => {
        console.log('MongoDB connected');
        run();
    })
    .catch(error => {
        console.log(error);
    });

Answer 2

You can use the native mongo driver's Admin#buildInfo method for that via your Mongoose connection:

var mongoose = require('mongoose');

mongoose.connect('mongodb://localhost/test', function(err){
  var admin = new mongoose.mongo.Admin(mongoose.connection.db);
  admin.buildInfo(function (err, info) {
     console.log(info.version);
  });
});

Answer 3

You can query the buildInfo directly from your Mongoose connection.

var mongoose = require('mongoose');

mongoose.connect('mongodb://localhost/test', function(err) {
    mongoose.db.command({ buildInfo: 1 }, function (err, info) {
        console.log(info.version);
    });
});

https://docs.mongodb.com/manual/reference/command/buildInfo/#dbcmd.buildInfo