Validate .env File Online — KEY=VALUE Parser

Validate .env syntax, quoted values and duplicate keys. Advisory secret hints — not a secrets scanner.

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.env validator — parse and hygiene checks
Validate local environment files before commit — catch malformed lines and duplicate keys without sending secrets to a server.

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. • Issues and severity counts appear in the results panel (not under the editor).

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

# API export NODE_ENV=development PORT=3000 LOG_LEVEL=debug API_BASE_URL=http://localhost:3000 DATABASE_URL=postgres://user:pass@localhost:5432/app REDIS_URL=redis://localhost:6379 DEBUG=true

Validation result

Valid — well-formed keys; DATABASE_URL may show advisory secret hint — shown in the results panel.

Duplicate key and bad line

.env input

REDIS_URL=redis://localhost:6379 REDIS_URL=redis://cache:6379 API_KEY=abc123 THIS IS NOT VALID JWT_SECRET=super-secret

Validation result

Warning on duplicate REDIS_URL; error on line without =; hints on API_KEY/JWT_SECRET keys — shown in the results panel.

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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Terraform HCL format/validate/minify, Dockerfile format & lint, Docker Compose and .env validation.

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