Free .env File Validator Online – Compare Environment Variables | Jaconir Tools
A free tool for developers to instantly compare `.env` and `.env.example` files. Quickly find missing or undocumented environment variables to prevent configuration errors and streamline team collaboration. Fast, secure, and no login required.
Features
Instant Comparison
Get immediate feedback on discrepancies between your environment files.
Clear Results
Highlights missing and extra variables in separate, easy-to-read lists.
Secure & Private
All processing is done in your browser. Your sensitive keys are never sent to a server.
1. Paste Your File Contents
Copy the entire contents of your local `.env` file (the one with your secret keys) and paste it into the left-hand text box. Then, copy the contents of your `.env.example` file (the one you commit to Git) and paste it into the right-hand box.
2. Validate
Click the "Validate Files" button. The tool will parse both files and compare the variable keys defined in each.
3. Review the Results
The results section will show you two lists: variables that are "Missing" from your main `.env` file (which can cause crashes) and variables that are "Extra" (which should probably be added to your `.env.example` file for other developers).
4. Apply Fixes
For "Missing" variables, add them to your `.env` file with the appropriate values. For "Extra" variables, add them to your `.env.example` file, usually with an empty value (e.g., `NEW_API_KEY=`), so that other developers know this variable is required.
Why Use This Tool?
Prevent "It Works on My Machine" Errors
This is one of the most common problems in team development. A new developer joins, pulls the code, but the app crashes because a required environment variable is missing. This tool helps prevent that by ensuring your `.env.example` is always up-to-date.
Streamline Onboarding
A clean and accurate `.env.example` file makes it much easier for new team members to get a project running locally, saving hours of frustrating setup time.
Improve Deployment Reliability
Before deploying to a new environment (like staging or production), you can use this tool to quickly verify that all required variables from the template are present in your deployment configuration.
Maintain Configuration Hygiene
Regularly using this tool helps keep your project's configuration clean and well-documented. It encourages the good practice of documenting every environment-specific variable.
Team Collaboration
Ensuring every developer on the team has a correctly configured local environment.
Open Source Projects
Providing clear setup instructions for contributors by maintaining an accurate `.env.example` file.
Pre-Deployment Checks
Validating your production or staging environment variables against the project template before deploying a new version.
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