The Security First Guide to AI Development: Edge Functions, Rate Limiting, and Supabase

Building an AI application is exciting, but it has a "dark side" that few mention at the beginning: security . If you don't prioritize security from day one, you not only risk your users' data, but you also leave your "wallet" open (via API keys) for anyone to consume your tokens and leave you with an astronomical bill. In this post, we'll break down the 4 pillars to secure your AI architecture using Next.js , Edge Functions , and Supabase . 1. The Frontend is Enemy Territory The most common mistake is calling OpenAI, Anthropic, or Gemini directly from the client. The problem: Any user with minimal knowledge can open the browser console ( F12 ), go to the "Network" tab, and see your API key in the headers. Once they have your key, they can use it in their own projects at your expense. The solution: Move all the logic to the server. Use Edge Functions or API Routes . Keys should only reside in environment variables ( .env ) that the client can never read. Golden rule: If your environmen