Validate .env File Online — KEY=VALUE Parser
Validate .env syntax, quoted values and duplicate keys. Advisory secret hints — not a secrets scanner.
Developer notes
• Not a dotenv or vault replacement. • Secret-pattern warnings are hints only (password, token, api_key in key name). • Spaces in unquoted values trigger warnings. • Never commit real production secrets — use .env.example in repos.
When teams pick this route
• Lint a .env.example template before sharing. • Find duplicate DATABASE_URL entries after merges. • Catch unclosed quotes from manual edits. • Quick review of export-prefixed shell env files.
Worked examples
Typical local dev file
.env input
Validation result
Duplicate key and bad line
.env input
Validation result
Navigate related DevOps tools
Infrastructure repos often pair .env with Compose — try validate Docker Compose and the DevOps hub.
.env validator FAQ
Parse and hygiene
Secrets scanner?
No — only lightweight hints when key names look sensitive. Use dedicated secret scanning in CI.
Supports export prefix?
Yes — lines like export KEY=value are parsed.
Quoted values?
Single and double quotes supported; unclosed quotes report an error with line number.
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