Environment Variables in Bun
From the Bun cheat sheet · Environment & Utilities · verified Jul 2026
Environment Variables
Access and manage environment variables with auto .env loading
typescript
// Access env vars (auto-loaded from .env)
const dbUrl = Bun.env.DATABASE_URL;
const port = Bun.env.PORT || "3000";
// Also available on process.env
const key = process.env.API_KEY;💡 Bun auto-loads .env files with no dotenv package — just create the file and go
⚡ Use bun --env-file to load a specific env file for different environments
📌 Both Bun.env and process.env work — Bun.env is slightly faster as it skips Node compat
🟢 import.meta.dir/file/path give you the current file location — no __dirname polyfill needed
envenvironmentdotenv