Scan your entire 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.

• Ensure all required environment variables are defined before deploying
• Catch missing or misconfigured variables early in development
• Improve collaboration by keeping teams aligned on required variables
• Reduce the risk of committing sensitive data
• Scale easily for monorepos and multi-environment setups

Generate a default configuration file:

dotenv-diff --init

→ See Configuration Documentation for more details.

Easily integrate dotenv-diff into your Git hooks or CI/CD pipelines to enforce environment variable consistency.

→ See Git Hooks Documentation for more details.

In SvelteKit and Next.js projects, dotenv-diff detects framework-specific environment variable misuses.

Example warning:

Framework issues (Sveltekit):
  - PUBLIC_URL (src/routes/+page.ts:1)
    → Variables accessed through import.meta.env must start with "VITE_"

→ See Framework Documentation for more details.

You can ignore specific environment variable warnings by adding comments in your code. For example:

const apiKey = process.env.API_KEY; // dotenv-diff-ignore

This is helpful when you know a specific warning is safe in your source code.

→ See Ignore Comments Documentation for more details.

Add expiration metadata to your environment variables to get warnings when they are about to expire. For example, in your .env file:

# @expire 2025-12-31
API_TOKEN=

→ See Expiration Documentation for more details.

In monorepos with multiple apps and packages, you can include shared folders:

{
  "scripts": {
    "dotenv-diff": "dotenv-diff --example .env.example --include-files '../../packages/**/*' --ignore VITE_MODE"
  }
}

→ See Monorepo Documentation for more details.

This will:

• Scan the current app
• Include shared packages
• Ignore variables used only in specific environments

• 0 → No errors
• 1 → Errors found (or warnings in strict mode)

Full documentation: https://dotenv-diff-docs.vercel.app

Issues and pull requests are welcome.
→ See CONTRIBUTING for details.

Licensed under the MIT license.

Created by chrilleweb