TOML Validator
Validate your TOML syntax instantly. Perfect for Cargo.toml, pyproject.toml, and other configuration files. 100% free and secure.
How to Validate TOML
- Paste your TOML data in the input area
- Click the "Validate" button
- View validation results with error locations if any
- Fix syntax errors and re-validate
Common TOML Errors
Unquoted Strings
String values must be quoted: name = "value" not name = value
Invalid Table Names
Table names in brackets must be valid: [section.subsection]
Duplicate Keys
Each key within a table must be unique.
Invalid Datetime Format
Datetimes must follow RFC 3339 format: 2024-01-15T10:30:00Z
Common Use Cases
- -Rust Cargo.toml dependencies
- -Python pyproject.toml
- -Hugo site configuration
- -Netlify configuration
- -Application settings files
- -CI/CD configurations
Frequently Asked Questions
What does the TOML Validator check?
The validator checks TOML syntax including proper table definitions, key-value formatting, valid data types, string escaping, and datetime formats.
What is TOML used for?
TOML (Tom's Obvious, Minimal Language) is commonly used for configuration files. Popular examples include Cargo.toml (Rust), pyproject.toml (Python), and various application configs.
How is TOML different from YAML?
TOML is simpler and less ambiguous than YAML. It uses explicit syntax for tables ([section]) and arrays, making it easier to parse and less prone to indentation errors.
Is my TOML data secure?
Yes, all validation happens directly in your browser. Your TOML is never sent to any server or stored anywhere.