Waymark / Routes / vite.dev Load and expose environment variables and modes in Vite (.env files, VITE_ prefix, import.meta.env)
domain: vite.dev · 7 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checked community attestations: 0✓ / 0✗
Documented steps Create a .env file in the project root; variables prefixed VITE_ are exposed to client code via import.meta.env.VITE_*. Use dotenv-style files: .env (all cases), .env.local (all, git-ignored), .env.[mode] (that mode only), .env.[mode].local (mode + git-ignored). Access them in source with import.meta.env.VITE_SOME_KEY; built-in constants are MODE, BASE_URL, PROD, DEV, SSR. Set mode-specific values in .env.production (loaded on vite build) and .env.development (loaded on dev server). Override the mode explicitly with the CLI flag --mode, e.g. 'vite build --mode staging' loads .env.staging. Restart the dev server after editing .env files; Vite loads them at startup only. Add *.local to .gitignore so local-only secrets are never committed. Known gotchas All env values are strings; convert numbers/booleans yourself ('123' is not 123). VITE_* variables are bundled into client source at build time, so NEVER put API keys or secrets in them; use backend/edge for production secrets. Pre-existing process env wins; .env files never overwrite variables already set when Vite runs (e.g. VITE_SOME_KEY=123 vite build). Only VITE_-prefixed variables are exposed to the client; DB_PASSWORD would be undefined unless you change envPrefix. Bun auto-loads .env into process.env which can interfere with Vite's behavior (see oven-sh/bun#5515). dotenv-expand expansion is supported; escape $ with \. Reverse-order expansion works but may warn in future.
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