Env File Diff & Linter

When would I use this?

Before promoting a deploy, or when a "works on my machine" bug turns out to be a missing environment variable, you need to know exactly how two .env files differ — not just line-by-line, but key-by-key, ignoring comment noise and formatting quirks.

Paste File A (say, .env.local) and File B (say, .env.production) below. Because these files hold secrets, actual values are hidden by default — you'll see which keys differ, not what they contain, until you explicitly reveal them.