Validate and Lint Your TOML Files
Ensure your TOML configuration is error-free with our validator and linter. It catches syntax errors, duplicate keys, and type mismatches, helping you write clean, reliable TOML.
Validate and Lint Your TOML Files
Check your TOML configuration for syntax errors, duplicate keys, and formatting issues.
How the TOML Validator and Linter Works
This tool validates TOML syntax and checks for common issues. It parses your TOML file and reports any syntax errors with detailed messages. Valid TOML ensures your configuration will be correctly read by applications and tools.
Validation Process
- Paste your TOML content into the input area
- Click "Validate TOML" to check
- The TOML parser attempts to parse your content
- Syntax errors are caught and reported
- Error messages include line numbers and descriptions
- Valid TOML shows a success message
- Copy or download your TOML content
Specific Use Cases
Pre-Commit Validation
Validate TOML configs before committing to Git. Catch syntax errors early in the development process.
Configuration Debugging
When an application fails to read config, validate the TOML. The validator identifies syntax issues quickly.
Learning TOML Syntax
New to TOML? Use the validator to check your work. Error messages help you learn correct syntax.
CI/CD Pipeline Checks
Add TOML validation to your CI pipeline. Prevent broken configs from reaching production.
Config File Generation
After generating TOML programmatically, validate the output. Ensure generated configs are syntactically correct.
What to Know Before Using This Tool
Understanding TOML validation:
- Validator checks syntax, not semantic correctness
- Error messages include approximate line numbers
- Common errors: missing quotes, invalid keys, bad dates
- Valid TOML may still have logical errors
- The validator uses the standard TOML parser
- Copy and download options are available
Frequently Asked Questions
What errors does the validator catch?
Syntax errors like unclosed strings, invalid keys, malformed dates, and incorrect table syntax.
Does it check for best practices?
This tool focuses on syntax validation. For style checks, use a dedicated TOML linter or formatter.
What if my TOML is valid but doesn't work?
Valid syntax doesn't guarantee correct configuration. Check that keys and values match what your application expects.
How accurate are line numbers?
Line numbers are approximate. The parser reports where it encountered the error, which may be after the actual issue.
Can I validate large TOML files?
Yes, but very large files may be slow in the browser. For large files, use command-line TOML validators.
What TOML version is supported?
The validator supports TOML 1.0 specification. This is the most widely used TOML version.
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