TOML Validator & Formatter Online Free — Validate & Beautify TOML Config Files

TOML Input

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How to Use

Paste your TOML content (Cargo.toml, pyproject.toml, etc.) into the editor
Click "Validate" to check for syntax errors
View detailed error messages with line numbers if any issues are found
Use "Format" to beautify the TOML output with consistent indentation

Use Cases

Validating Cargo.toml files for Rust projects before building
Checking pyproject.toml syntax for Python packaging
Verifying configuration files before deploying to production
Formatting TOML files for consistent team coding standards

Frequently Asked Questions

What is TOML?

TOML (Tom's Obvious, Minimal Language) is a configuration file format designed to be easy to read. It's used by Rust (Cargo.toml), Python (pyproject.toml), Hugo, and many other tools.

How is TOML different from YAML?

TOML uses explicit syntax with brackets and equals signs, making it less ambiguous than YAML. TOML doesn't rely on indentation and has clearer rules for data types, making it harder to make mistakes.

Can I validate Cargo.toml files?

Yes! Paste your Cargo.toml content and the validator will check for TOML syntax errors. Note that it validates TOML syntax, not Cargo-specific fields.