var sql = require('mssql');
var connection = new sql.Connection({
    user: 'sa',
    password: 'password',
    server: 'localhost\SQLEXPRESS',
    database: 'Demo'
});

connection.connect(function (err) {
     if (err) console.log(err);

    var request = new sql.Request(connection); // or: var request = connection1.request();
    request.query('select * from EmpInfo', function (err, recordset) {
        // ... error checks

        console.dir(recordset);
    })
});