dotenv-diff CLI - Validate environment variable usage in your codebase

Scan your codebase to detect every environment variable reference. It helps you catch missing, unused, duplicated, and misused variables early, before they cause runtime errors. First-class support for SvelteKit and Next.js. Also works well in modern JavaScript/TypeScript projects and frameworks like Node.js, Nuxt, and Vue — or any other setup where you want reliable .env file comparison.