TOML Formatter
Format TOML configuration files with proper indentation. Also validate syntax against the TOML 1.0 spec.
Output
How to use the TOML Formatter
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Paste your TOML configuration.
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Click Format or Validate.
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Copy the formatted TOML or fix errors.
What is TOML?
TOML is a configuration file format designed to be more human-readable than JSON or YAML. Used by Cargo (Rust), Poetry (Python), and many other tools. This formatter standardizes indentation and validates against the TOML 1.0 specification.
Key features
- Format TOML with consistent indentation
- Validate syntax against TOML 1.0
- Error messages with exact line numbers
- All processing is local
Frequently asked questions
Does it support all TOML 1.0 features?
Yes — dotted keys, inline tables, arrays of tables, all date/time formats, and literal strings.
Where is TOML used?
Rust's Cargo.toml, Python's pyproject.toml, Go modules, and many CI/CD tools.
Is my config uploaded?
No. Everything runs in your browser.