env-diff

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> Compare .env files across environments, branches, and runtimes. Catch missing variables, type mismatches, and configuration drift before deployment.

Built by AdametherzLab with Claude.

Environment variable mismatches are one of the most common causes of deployment failures. A missing DATABASE_URL, a PORT that changed from number to string, a secret that exists in development but not production — these bugs are silent until they break production.

env-diff catches them all.

• Type-aware diffing — Catches when PORT=3000 (number) becomes PORT="3000" (string)
• Git branch comparison — env-diff .env:main .env:staging compares across branches
• Secret masking — Automatically detects and masks API keys, tokens, and passwords
• Multi-file matrix — Compare dev, staging, and prod simultaneously
• Codebase scanning — Auto-generate .env.example from your source code
• Sync mode — Generate patches to fix environment drift
• Watch mode — Live drift detection during development
• CI/CD ready — GitHub Action, strict mode, JSON output for automation
• MCP server — Native integration for AI coding agents (Claude Code, Cursor)
• Zero dependencies — Pure TypeScript, runs on Bun or Node.js 20+
• Config file — Persistent settings via .envdiffrc.json

| Feature | env-diff | dotenv-linter |