DataFormattools
ENV · Validator

.env File Validator & Linter

Validate .env and dotenv files online. Spot duplicate keys, syntax errors, missing values, and unquoted strings with 100% in-browser privacy.

Syntax & Structure Validator
Paste or type data below to validate syntax and structure in real time.
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100% In-Browser Privacy: All conversions, formatting, and validations run purely on your machine using client-side JavaScript. Your data, code snippets, and environment variables are never transmitted to any server or recorded in logs.
Specifications

How .env Validator Works

  • Parses KEY=VALUE pairs line by line according to dotenv specifications.
  • Detects duplicate environment variable declarations.
  • Flags unquoted values containing spaces or special characters.
Demonstration

Example Input & Output

Analyzes environment variables, checking for duplicate keys, syntax errors, unescaped whitespace, and quoting issues.

.env File Contents
PORT=3000
NODE_ENV=production
DATABASE_URL=postgres://user:pass@localhost:5432/mydb
# Duplicate key example:
PORT=8080
Expected Output
⚠ Warnings Found:
- Line 5: Duplicate key 'PORT' (previously declared on Line 1)
Applications

Common Use Cases

CI/CD Secrets Check

Ensure .env.example or deployment secrets contain no malformed variables.

Debugging App Startup Errors

Find duplicate or misconfigured env variables causing container crashes.

Guidelines

Key Specifications & Gotchas

Spaces Around Equals Sign

Variable assignment must not have spaces (KEY=value, not KEY = value).

Questions

Frequently Asked Questions

Is it safe to paste environment variables?

All validation runs 100% locally in your browser. However, we always recommend using placeholder values for production secrets.

What errors does the .env validator detect?

It detects duplicate keys, spaces around = sign, unclosed quotes, and invalid variable name characters.

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