10 Things Nobody Tells You About process.env

Short summary

Node.js environment variables have hidden gotchas: case-sensitivity varies by OS, all values are strings (no auto-parsing), and .env files require explicit loading. Child processes inherit all parent environment variables including secrets—validate, parse types, and pass only needed vars. Use libraries like CtroEnv for automatic .env loading and secret masking.

• •Case-sensitivity in env var names differs between Windows and Linux; use validation to catch typos
• •All environment variable values are strings; explicit parsing is required for numbers and booleans
• •Child processes inherit all parent environment variables including secrets; pass only necessary variables

Generated with AI, which can make mistakes.