.env Diff Checker
Visualize environment-variable diffs by key to quickly detect missing or unexpected config changes across deployments.
Status
Runs in your browser. No input is sent to a server.
How to use
Paste before/after `.env` files and click Compare. Review changes before deployment.
Notes (this tool)
- Duplicate keys are evaluated with last-one-wins.
- Use masked output when handling secrets.
About this page
What does this tool do?
Compares two `.env` texts and lists added, removed, and changed keys.
Useful for config reviews, environment migration checks, and staging/production diff audits.
What this tool does
- Extract added/removed/changed keys
- Detect duplicate keys and invalid lines
- Output report with masked values
Notes
- This implementation targets common `.env` syntax (`KEY=value`) and does not evaluate advanced shell expansions.
- Duplicate keys use last-one-wins semantics.
- Enable value masking when handling secrets in shared screens.
Referenced specs
- 12-Factor App (Config)
- Common dotenv conventions (implementation may vary)
FAQ
Are comments and blank lines compared?
No. Only valid `KEY=value` entries are compared.
What if the same key appears multiple times?
The last occurrence is used, and duplicates are reported as warnings.
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