We're coming to the end of this journey of learning Node.js. But there is one important topic left to discuss: security. The security of your applications is very important. Do you want to get into the news because your application is the greatest thing since Twitter, or do you want to be known for a massive cybersecurity incident launched through your website?

Cybersecurity officials around the world have for years clamored for greater security on the internet. Security holes in things as innocent as internet-connected security cameras have been weaponized by miscreants into vast botnets and are used to bludgeon websites or commit other mayhem. In other cases, rampant identity theft from security intrusions are a financial threat to us all. Almost every day, the news includes more revelations of cybersecurity problems.

We've mentioned...