Find the mongo server version and replica set information from nodejs client.

getMongoVersionAndReplSetInfo.js

const MongoClient = require('mongodb').MongoClient;
const assert = require('assert');

var url = 'mongodb://localhost:27017';

const dbName = 'test';

const client = new MongoClient(url, { useUnifiedTopology: true });

client.connect(function(err) {
    assert.equal(null, err);
    console.log("Connected successfully to server");

    client.db().executeDbAdminCommand({ buildInfo: 1 })
        .then(_d => console.log(`MONGODB server version :: ${_d.version}`))

    client.db().executeDbAdminCommand({ replSetGetStatus: 1 })
        .then(_d => console.log(`REPLICASET :: ${_d.set}`),
            _e => console.log(_e))
});