Env Variable Template Generator: Build a .env.example Without Leaking Secrets
Every project with environment-based configuration needs a .env.example — a version-controlled file that documents which variables exist, without exposing the real secret values. This tool takes your working .env file and strips out the sensitive values automatically, so you never have to manually redact a config file by hand again.
Keys, comments, and blank lines are preserved exactly; only values are replaced.
Why .env Files Should Never Be Committed
A .env file typically holds live database credentials, API keys, and signing secrets. Committing it — even once, even to a private repo — means that secret is now in git history forever, recoverable even after you delete and force-push. A .env.example avoids the problem entirely by never containing real values in the first place.
Choosing a Placeholder Strategy
Empty values are the safest default and force every teammate to explicitly fill in their own credentials. Generic placeholders are slightly more helpful, since the file at least indicates 'you need to put something here.' Type-inferred placeholders are the most useful for onboarding, since a value like https://example.com or postgresql://user:password@localhost:5432/dbname tells a new developer roughly what shape of value is expected.
This Doesn't Replace a Secret Scanner
This tool builds a clean template from your current .env, but it doesn't audit your git history for secrets that were already committed. If you suspect a real secret has ever been pushed, rotate it — removing it from a future commit doesn't remove it from history.
Practical Examples
Onboarding a New Teammate
Generating a shareable template from a working config.
- 1.Paste your real .env
- 2.Select 'Type-Inferred Placeholder'
- 3.Commit the output as .env.example
- 4.Teammate copies it to .env and fills in their own values
Quick Redaction Before a Support Ticket
Sharing your config shape without your secrets.
- 1.Paste .env
- 2.Select 'Empty Values'
- 3.Share the output safely in a support thread
Type-Inferred Placeholder Examples
- true / false: kept as-is
- 123456: becomes 0
- https://api.example.com: becomes https://example.com
- postgresql://...: becomes a generic connection string
- sk_live_...: becomes your_secret_here
Good .env.example Habits
- Commit .env.example, never .env
- Add .env to .gitignore on day one
- Keep .env.example in sync whenever you add a new variable
- Rotate any secret that was ever accidentally committed
Frequently Asked Questions
Why should I commit a .env.example instead of my real .env?
Your real .env contains live secrets — database passwords, API keys, tokens. A .env.example lists the same variable names with placeholder values, so teammates know what to configure without any secret ever touching version control.
What's the difference between the three placeholder modes?
'Empty Values' leaves KEY= with nothing after the equals sign. 'Generic Placeholder' fills every value with the same 'your_value_here' text. 'Type-Inferred Placeholder' looks at the original value's shape (URL, email, boolean, database connection string, likely secret) and generates a more descriptive placeholder.
How does type inference decide what placeholder to use?
It pattern-matches the original value: true/false stays as-is, numeric strings become 0, http(s) URLs become https://example.com, database connection strings get a generic connection string shape, and long or key-prefixed strings (sk_, pk_, token_) become 'your_secret_here'.
Does this tool ever send my real .env anywhere?
No. Everything runs in your browser. That said, always double check the output before committing it — this tool infers types heuristically and isn't a substitute for a manual review of what you're about to push to a public or shared repo.
Are comments and blank lines preserved?
Yes. Comment lines (starting with #) and blank lines are kept exactly as-is, so your .env.example keeps the same structure and documentation as the original file.
What about the 'export' prefix used in some .env files?
It's preserved if present — lines like 'export DATABASE_URL=...' become 'export DATABASE_URL=' (or the chosen placeholder) rather than being stripped.