Environment Variable Validation

Use this skill to validate .env files against .env.example or a JSON schema. Catches missing, extra, or invalid environment variables before your app does.

Usage

# Zero config — checks .env against .env.example
npx env-guard

# Custom paths
npx env-guard --env .env.production --example .env.example

# JSON schema validation
npx env-guard --schema env-schema.json

As a Library

import { validate } from "env-guard";

const result = validate({
  env: ".env",
  example: ".env.example",
});

if (!result.valid) {
  console.error(result.errors);
  process.exit(1);
}

Key Patterns

• Zero config by default — compares .env against .env.example in the current directory
• JSON schema mode validates types, patterns, and required fields
• Returns structured errors: missing variables, extra variables, type mismatches
• Zero dependencies — no supply chain risk
• Exit code 1 on failure — safe to use in CI pipelines and pre-deploy hooks