How to safely parse, merge, or generate .env files (without uploading secrets online)

Diogo Abreu — Fri, 17 Apr 2026 16:00:00 +0000

Working with .env files is something we all do, but it’s surprisingly easy to make mistakes.

Duplicate keys, malformed values, missing quotes… they can be annoying to debug.

At some point I thought:
“Why isn’t there a simple tool that does all the work for me?”

Then I realized something else:
An online .env viewer sounds like a terrible idea.

If I saw one, I’d assume it’s stealing companys' keys.

So I built one with a constraint:
Everything must run 100% in the browser and be 100% safe.

No uploads
No backend
No storage
No network requests at all

All very highlighted and verifiable through devtools.

The result is a small tool that:

Parses .env files instantly
Detects duplicate keys
Highlights syntax issues
Shows everything in a clean table

Additionally, I included some other pages to merge multiple .env files together, or to generate a fresh .env file with the most commonly used keys.

https://env-tools.vercel.app/

I’d really appreciate some feedback, especially on how to make the “this is safe” part clearer. Hope this tool is useful and thank you very much in advance!

Forem: Diogo Abreu

How to safely parse, merge, or generate .env files (without uploading secrets online)