5 Server Action Mistakes That Ruin Your Next.js App ❌

Are you making these 5 common mistakes when using server actions in Next.js/React 19? If yes, your app might have security holes and bugs. Starting code: https://github.com/codinginflow/server-actions-mistakes/tree/Starting-point Final code: https://github.com/codinginflow/server-actions-mistakes ⭐ Get my full-stack Next.js with Express & TypeScript course: https://codinginflow.com/nextjs ✅ Get my free React Best Practices course: https://www.codinginflow.com/reactbestpractices 💌 Join my newsletter for regular web dev tips: https://codinginflow.com/newsletter 💬 Join our developer community on Discord: https://codinginflow.com/discord 📣 Follow Coding in Flow on social media: Twitter: https://twitter.com/codinginflow Instagram: https://instagram.com/codinginflow TikTok: https://tiktok.com/@codinginflow Facebook: https://facebook.com/codinginflow Timestamps: 0:00 - Introduction 0:51 - Sample code 2:06 - Mistake 1: Not wrapping client-side server action calls into transitions (useTransition, revalidatePath) 9:27 - Mistake 2: Not validating the user input server-side (Zod) 14:49 - Mistake 3: Not authenticating the user server-side 16:17 - Mistake 4: Not returning errors correctly 21:35 - useActionState 23:40 - Mistake 5: Using server actions to fetch data (GET request)