Configuration & Environment — Where Your App Learns Its Secrets 🤫

Welcome to the backstage of your NestJS app — where secrets are whispered, environments are managed, and config files rule like wizards behind the curtain 🧙‍♂️.

NestJS apps are like international spies 🕵️ — they behave differently depending on where they are:

• Local development? Be loud and verbose.
• Production? Be cool and quiet.
• Staging? Somewhere in between… like a teenager.

🎯 Why Configuration Matters

Imagine hardcoding your database password right into your app... 😱 Now imagine pushing that to GitHub… 😭 That’s why we keep such secrets in .env files and load them using ConfigModule.

This section teaches your app how to:

• Read its environment like a seasoned traveler ✈️
• Switch behaviors based on whether it's in Dev, Prod, or "Oops-just-testing" mode 🧪
• Keep secrets in .env, not in your code (because we don’t want angry DevOps folks) 🔐

🧭 What You’ll Learn in This Section

Topic	What You'll Learn
✅ Adding .env & ConfigModule	Load environment variables like a boss
🌍 Managing configs across environments	Make your app behave appropriately in any setting

🧪 Real-World Use Cases

• Database URLs changing between local and production 🔄
• Feature flags that turn stuff ON/OFF like Christmas lights 🎄
• API keys, tokens, and “do-not-share-this” secrets 👀

So, get ready to give your app its memory, mood, and manners... because without configuration, it's just a confused robot 🤖 yelling into the void!