How to Add Authentication to Any App in Under an Hour (2026 Guide)

Auth is the part every tutorial skips. Here's a complete, honest breakdown of your three real options in 2026. Authentication is where most "build an app in a weekend" tutorials quietly stop. They get you to a working UI, a connected database, maybe a deployed URL — and then assume auth is someone else's problem. It isn't. It's yours, and it's the part that most commonly causes production incidents, data breaches, and support tickets. What you'll learn in this post: The three realistic auth impl