Environment Variable Naming Linter
Lint .env keys for naming convention consistency, invalid key formats, duplicate declarations, and reserved name conflicts. Fast browser-based config quality check for development and DevOps workflows.
Lint .env keys for naming convention mismatches, duplicates, reserved names, and invalid identifiers. Paste full env files or plain key lists and audit naming quality instantly.
Parsed Keys
6
Unique Keys
4
Errors
1
Warnings
3
| Line | Key | Severity | Issue | Suggested Fix |
|---|---|---|---|---|
| 3 | redis-host | Warning | Does not match UPPER_SNAKE_CASE. | REDIS_HOST |
| 4 | 1INVALID_KEY | Error | Invalid key format. Use letters, numbers, underscores, dots, or hyphens; do not start with a digit. | — |
| 5 | PATH | Warning | Reserved shell/system variable name detected. Avoid overriding this key. | — |
| 6 | API_BASE_URL | Warning | Duplicate key; already declared on line 2. | — |
Features
Convention Linting
Validate keys against UPPER_SNAKE_CASE, camelCase, PascalCase, kebab-case, or lower_snake_case.
Duplicate and Reserved Detection
Catch duplicate declarations and risky system-reserved variable names before deployment.
Identifier Validation
Flags invalid key syntax such as leading digits or unsupported characters.
Auto-Fix Suggestions
Get normalized key naming suggestions for every mismatch to speed up cleanup.
Use Cases
CI Preflight Checks
Lint environment keys in pull requests before merging to prevent naming drift.
Legacy .env Cleanup
Standardize mixed naming styles across old environment files with guided suggestions.
Team Convention Enforcement
Apply one naming style across services and reduce onboarding confusion for new developers.
Security and Runtime Stability
Surface risky reserved names and malformed keys that can break runtime config loading.
Multi-Service Monorepo Auditing
Paste combined env files from multiple services and catch cross-service naming collisions or inconsistent prefix usage in one pass.
Framework Migration Prep
Validate that variable names conform to framework-specific rules, such as NEXT_PUBLIC_ prefixes for client-side exposure, before migrating between platforms.
About Environment Variable Naming Linter
Why naming consistency matters
Inconsistent env naming causes silent misconfigurations, fallback bugs, and confusing production incidents. A naming linter enforces one convention and catches drift early in development workflows.
What this linter checks
The tool checks key format validity, naming convention compliance, duplicate declarations, and risky reserved variable names. It also generates naming suggestions so fixes are immediate.
Common naming conventions supported
The linter supports SCREAMING_SNAKE_CASE (the most widely adopted standard), as well as prefixed patterns like APP_, SERVICE_, and NEXT_PUBLIC_. Enforcing a prefix scheme makes it easy to distinguish application config from system variables and framework-injected values.
Reserved and risky variable names
Certain names like PATH, HOME, USER, and SHELL are reserved by the operating system and can cause unpredictable behavior if overwritten. The linter flags these alongside framework-reserved names such as NODE_ENV and PORT to prevent accidental shadowing in any runtime environment.
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Frequently Asked Questions
What input formats are supported?
You can paste full .env content (KEY=VALUE lines), export-prefixed lines, or plain variable keys one per line.
Which naming conventions can I validate?
The linter supports UPPER_SNAKE_CASE, lower_snake_case, camelCase, PascalCase, and kebab-case.
Does the linter detect duplicate keys?
Yes. Duplicate declarations are flagged with the original line number so you can resolve accidental overrides quickly.
Why are reserved names flagged?
Some names like PATH or HOME are commonly managed by the shell or runtime environment. Overriding them can lead to hard-to-debug behavior.
Is this tool safe for secret values?
Yes. Analysis runs entirely in your browser and no env content is uploaded by this tool.
Does the linter support multi-line or commented .env files?
Yes. Lines starting with # are treated as comments and skipped. Only KEY=VALUE lines are parsed for naming validation.
Is this tool free to use without an account?
Yes. The environment variable naming linter is 100% free with no signup required. All processing happens client-side in your browser.