Online TOON Validator & Formatter

Validate, format, and minify TOON files instantly. Whether you're using TOON for configuration, documentation, or dev tools, this validator helps ensure clean and correct syntax.

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What is a TOON validator?

A TOON validator checks whether your data follows proper TOON syntax: key–value pairs, section headers, indentation, arrays, and valid literals. It helps catch missing brackets, invalid nesting, or malformed sections.

TOON (TOML-like Object Notation) is gaining popularity as a cleaner, more readable alternative to JSON, making validation even more important in real-world projects.

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Why TOON is trending

• Far easier to read and edit manually compared to JSON
• Familiar structure similar to TOML — without the complexity
• Ideal for config files, package settings, editor presets, dev tools, and documentation
• Great for teams: cleaner diffs, simpler reviews, fewer syntax pitfalls

This growing adoption makes a proper validator essential.

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How to use the TOON Validator

1. Paste your TOON data into the input area.
2. Choose one of the options: Validate, Format, or Minify.
3. Click the button corresponding to your action.
4. View syntax errors, cleaned-up output, or production-ready minified versions.

The tool highlights issues with exact line numbers and clear messages.

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Practical use examples

• Developers: Validate configs before committing
• DevOps/CI: Ensure configuration correctness in automated pipelines
• System administrators: Keep server configs tidy and readable
• Documentation writers: Generate consistent, formatted TOON examples
• Tool creators: Use TOON as a settings format and validate input automatically

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Frequently Asked Questions (FAQ)

What happens if my TOON file is invalid?

The validator displays the exact line and character where the error occurs and describes the issue.

Can I auto-format TOON?

Yes — formatting cleans indentation and spacing, making the structure cleaner and easier to maintain.

Is TOON the same as TOML?

No. TOON is inspired by TOML but is intentionally more flexible and simpler to write.

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Tips and curiosities

• TOON is perfect when you want JSON’s structure but TOML’s readability.
• Proper formatting reduces bugs in config-heavy projects.
• Minified TOON is useful for packaging, deployment, or performance-sensitive contexts.
• Always validate TOON before using it in production.

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➡️ Paste your TOON data and validate, format, or minify instantly!