Is it safe to paste API keys into this tool?

Yes. The .env editor runs entirely in your browser — all parsing and validation happens locally in memory. Your environment variables and API keys are never transmitted to any server.

What does the validator check?

The parser checks for: duplicate KEY names (error), missing = separators (error), empty values (warning), and blank keys (error). Each issue is shown with the exact line number.

Can I generate a .env.example from my .env file?

Yes. Switch to the .env.example view to see a copy of your file with all values stripped out. This template is safe to commit to version control so teammates know which variables to configure.

.env File Editor & Validator

100% Client-Side Private — Zero Server Uploads

Visual editor for .env files — parse, validate, detect duplicate keys, mask secrets, generate .env.example templates. 100% Client-Side, secrets never leave your browser.

# Application
APP_NAME=MyApp
APP_ENV=development
APP_URL=http://localhost:3000
PORT=3000

# Database
DATABASE_URL=postgresql://user:password@localhost:5432/mydb
REDIS_URL=redis://localhost:6379

# Authentication
JWT_SECRET=super-secret-jwt-key-change-in-production
JWT_EXPIRES_IN=7d

# API Keys
STRIPE_KEY=sk_test_abc123
SENDGRID_API_KEY=

# Feature Flags
ENABLE_ANALYTICS=true
MAX_UPLOAD_SIZE=10485760

How do I use .env File Editor & Validator?

Paste your .env file content into the editor, or select a framework template from the sidebar.

The validator automatically detects duplicate keys, empty values, and format errors.

Switch to Table View to inspect variables without exposing sensitive values.

Toggle secret masking to share screenshots safely without exposing credentials.

Download the .env file or generate a .env.example template with empty values.

What features does .env File Editor & Validator offer?

Real-time validation: duplicate keys, empty values, format errors

Table view for structured variable inspection

Secret masking — hide credential values with one click

.env.example generator — strip values, keep keys for team sharing

6 framework presets: Next.js, Django, Laravel, Express, Spring Boot, Flask

Frequently Asked Questions about .env File Editor & Validator

Do you store my .env file or secrets on your servers?

No. This tool runs 100% in your browser — your .env content is parsed locally in memory and never transmitted anywhere. It is safe to paste API keys and database credentials.

What is a .env.example file?

A .env.example is a template that lists all required environment variable keys with empty values. It is safe to commit to version control so teammates know which variables to configure.

What types of validation does the tool perform?

The parser checks for: duplicate KEY names (error), missing = separators (error), empty values (warning), and empty keys (error). All issues are shown in the sidebar with line numbers.

Can I use this as a dotenv linter?

Yes. The parser catches the same issues dotenv-lint would flag in CI: missing = separators, duplicate keys, and empty values. Each issue appears with its exact line number so you can fix it quickly.

Explore Related Online Tools

SQL

SQL Formatter

Format and beautify SQL queries with support for multiple dialects including PostgreSQL, MySQL, SQLite, and more.

JSON

JSON Formatter

Format, validate, and minify JSON data instantly. Detect syntax errors with precise line and column information.

YAML

YAML Formatter

Format and validate YAML documents. Convert between YAML and JSON effortlessly, all in your browser.