TOML Validator

Validate TOML syntax and instantly see if your config file is valid. Errors are reported with line numbers. The parsed result is shown as JSON for easy inspection. Useful for Cargo.toml, pyproject.toml, and any TOML config.

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Frequently Asked Questions

What is TOML?▼

TOML (Tom's Obvious, Minimal Language) is a configuration file format designed to be easy to read. It uses key = value pairs, [section] headers, and supports strings, integers, floats, booleans, arrays, and tables. It's used by Rust (Cargo.toml), Python (pyproject.toml), and many other projects.

What types does TOML support?▼

TOML supports: strings (in double or single quotes), integers, floats, booleans (true/false), dates/times (ISO 8601), arrays ([1, 2, 3]), and tables/sections ([header]).

How is TOML different from YAML?▼

TOML uses explicit syntax (key = value, [section]) that avoids YAML's indentation-sensitive pitfalls. TOML is simpler and less error-prone for config files, while YAML is more expressive for data structures.

What projects use TOML?▼

TOML is used by Rust's Cargo package manager (Cargo.toml), Python's packaging system (pyproject.toml), Hugo static site generator, and many others. It's the standard config format for modern Rust and Python tooling.

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