var sql = require('mssql');

var config = {
    user: 'sa',
    password: '1.password.1',
    server: 'localhost\\SQLEXPRESS', // You can use 'localhost\\instance' to connect to named instance
    database: 'epi'
}

sql.connect(config, function(err){
    if(err != null)
        console.log(err);

    console.log(sql);
});