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 implementation paths available in 2026 Step-by-step walkthrough of a custom JWT system (for developers who want control) Honest trade-off comparison of managed auth services (Auth0, Clerk, Supabase Auth) When to use an AI app builder that ships auth pre-configured The security mistakes developers make on every path Your Three Options Before writing a single line of code, it helps to understand what you're choosing between. Option 1: Roll your own JWT auth. Full control. Maximum flexibility. Highest implementation risk.…