env-guardTyped, fail-fast env validation

Strongly typed, zero-dependency environment variable validation for Node.js and TypeScript.

🔒 Type-safe

Full TypeScript inference from your schema — including literal types with choices.

Throws on startup with all validation errors listed at once, not one at a time.

Just your code and Node.js. Built-in .env file loading, no dotenv needed.

First-class integrations for Next.js, Vite, Astro, SvelteKit, and Remix.

Re-read env vars at runtime with change callbacks — ideal for secrets rotation.

Mark variables as sensitive to redact values in error messages and change events.

Use Zod schemas for env validation — coerce, transform, refine, enum, and more. Available as @frauschert/env-guard-zod.