ENV Var Prefix Filter
Filter environment variable names by prefix and separate public from private-looking keys.
What the ENV Var Prefix Filter does
Filter environment variable names by prefix and separate public from private-looking keys. PUBLIC_API_URL appears in the public list while SECRET_TOKEN is flagged as private-looking Adjust the controls and the preview updates immediately, so you can dial in exactly what you want and copy the result straight into your project — no build step and no account.
One thing to keep in mind: Prefix rules are project conventions, not security controls. Never expose secrets just because a name matches.
Private and in your browser
Everything runs locally in your browser. Your input is never uploaded, so the tool stays fast and works offline, and the copy and download buttons always use the current result shown in the output panel.
Frequently Asked Questions
What does the ENV Var Prefix Filter do?
Filter environment variable names by prefix and separate public from private-looking keys. PUBLIC_API_URL appears in the public list while SECRET_TOKEN is flagged as private-looking.
What should I keep in mind?
Prefix rules are project conventions, not security controls. Never expose secrets just because a name matches
Does it upload my input?
No. The ENV Var Prefix Filter runs entirely in your browser — your input is never uploaded, and it keeps working offline once the page has loaded.
Practical utilities for front-end design and implementation work.