Free .env File Validator & .env.example Generator - 100% Private
Compare .env vs .env.example, find missing variables, validate syntax, and generate .env.example instantly. Runs entirely in your browser — your secrets never leave your device.
100% Private — Runs Offline in Your Browser
Your .env file contains secrets. Nothing is uploaded or stored. All validation happens locally on your device.
Why use a .env validator?
When you clone a project, you need to know which environment variables are missing. Manually comparing .env and .env.example is error-prone — especially on large Next.js or Node.js apps with dozens of keys. Our free .env file validator finds missing variables instantly and highlights extras that are not documented in .env.example.
Developers spend time copying keys by hand, forgetting new secrets after a teammate adds them, or committing incomplete .env.example files. This tool turns that into a one-click check so onboarding and CI setup stay reliable.
How to generate .env.example from .env?
Paste your .env file with secrets, click Generate .env.example — it removes values and keeps keys. Perfect for committing to GitHub without leaking secrets. Comments and blank lines are preserved so your example file stays readable.
After generating, the result is also placed in the .env.example pane so you can immediately compare it against another template or share a clean example with your team.
Is my .env safe?
Yes, 100% private. Unlike other validators, your .env file (which has secret keys) never leaves your browser. No server, no tracking. Works offline. That privacy focus matters — API keys, database URLs, and JWT secrets should never be pasted into tools that upload content to a backend.
Features
Compare .env vs .env.example
Missing variables show in red. Extra keys (in .env but not in .env.example) show in yellow so you can keep your example file in sync.
Generate .env.example
Strip secret values in one click. Download or copy the safe template for GitHub, docs, or onboarding checklists.
Validate syntax
Find duplicate keys, missing = signs, and invalid key names before they break your deploy or local setup.
100% browser-based
Built for Node.js and Next.js developers who need a private env file checker — no signup, no upload, no data retention.
How to Use
Paste or upload your .env file in the left box
Paste or upload .env.example in the right box (or generate one from .env)
Click Compare Variables to see missing (red) and extra (yellow) keys
Click Validate Syntax to catch duplicate keys and missing = signs
Click Generate .env.example to strip values and download a safe template
Frequently Asked Questions
How to check missing env variables?
Paste your .env and .env.example files, then click Compare Variables. Keys that exist in .env.example but not in .env appear in red as missing. Keys only in .env appear in yellow as extras you may want to document.
How to generate env.example?
Paste your filled .env file and click Generate .env.example. The tool keeps every key (and comments) but removes secret values so you can safely commit the file to version control.
Is my .env file safe?
Yes. Validation and generation run entirely in your browser. Your environment variables are never sent to a server or stored. You can even use the page offline after the first load.
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