ENV Diff Comparator

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What is ENV Diff Comparator?

ENV Diff Comparator is a configuration intelligence tool that goes beyond simple text comparison. It performs key-based semantic analysis of .env files, detects secrets and security risks, generates actionable recommendations, and provides a merge editor — all processed entirely in your browser. Ideal for developers and DevOps engineers managing environment configurations across staging, development, and production.

How to Use

1. Paste or upload two .env files into the left and right panels (or click "Example" to load a demo). 2. Adjust normalization options (trim whitespace, ignore case, etc.) if needed. 3. Click Compare to analyze differences. 4. Review the summary metrics bar showing added, removed, changed, and secret counts. 5. Switch between Grouped, Table, Side-by-Side, or Merge views. 6. Use filters (Changed, Missing, Secrets, Critical) to focus on what matters. 7. Check the Recommendations panel for security insights and best-practice suggestions. 8. In Merge view, select values per-key and download a merged .env file.

Key Features

  • Key-based semantic diff — compares by variable name, not line position
  • Secret detection — identifies API keys, JWT tokens, passwords via pattern matching and entropy analysis
  • Security recommendations — flags same secrets across environments, localhost in production, debug mode, weak passwords
  • Variable categorization — groups variables by domain (Auth, Database, API, Feature Flags, etc.)
  • Merge editor — per-key A/B/Custom selection with live preview and .env.merged download
  • Smart parsing — handles comments, quoted values, export prefix, empty values, duplicate keys
  • Multiple views — Grouped, Table, Side-by-Side, and Merge views
  • 100% client-side — zero data leaves your browser

Supported .env Formats

The parser handles all common .env file conventions:

  • Standard KEY=value syntax
  • Quoted values: double ("value"), single ('value'), backtick (`value`)
  • Empty values: KEY=
  • Export prefix: export KEY=value
  • Full-line comments: # comment
  • Inline comments: KEY=value # comment
  • Duplicate keys (last value wins, with warning)
  • Files with any extension (.env, .env.local, .env.production, .txt, etc.)