Why Your Environment Variables Aren't Loading (And How to Fix It)
You’ve set DATABASE_URL in your .env file. You’ve exported it in your shell. But your application still can’t find it. Sound familiar? Environment variable issues are one of the most common — and frustrating — debugging sessions. Here’s a systematic guide to finding and fixing the problem. The Quick Checklist Before diving deep, check these common culprits: Did you restart your application? Environment variables are read at process start Are you in the right shell session? Variables exported in one terminal don’t exist in another Is your .env file in the right directory? Most libraries look in the current working directory Did you spell it correctly? DATABASE_URL vs DATABSE_URL happens more than you’d think Python: The os.environ Mystery Problem: KeyError When Accessing Variables 1 2 import os database_url = os.environ['DATABASE_URL'] # KeyError! Fix 1: Check if the variable exists first ...