The Ultimate Next.js & React Master Prompt for AI Coding Assistants (Cursor, Claude, Devin)

A Next.js Master Prompt is a strict, structured set of instructions that locks an AI coding assistant into Next.js 14+ App Router conventions, TypeScript strict mode, and Tailwind CSS best practices — preventing the hallucinations and context collapse that plague most AI-assisted development sessions. Below, we provide a free, copy-paste "Lite" template you can drop directly into Cursor, Claude, or Devin. But first, let's understand why you need one. Why Standard Prompts Break Next.js App Router