What does a YAML validator check?

A YAML validator checks whether your YAML can be parsed successfully and whether the structure is syntactically valid. It catches indentation errors, malformed lists, invalid mappings, and other parsing problems that would otherwise break config-driven tooling.

Does this YAML validator upload my config file?

No. Validation happens locally in your browser, so your YAML content stays on your device. That makes it suitable for private configs, deployment files, and internal documentation snippets.

Why show YAML as JSON after validation?

A JSON preview makes the parsed structure easier to inspect. It helps you confirm whether arrays, nested objects, booleans, and scalar values are being interpreted correctly after parsing.

Can I validate Docker Compose or GitHub Actions YAML?

Yes. This tool validates the YAML syntax of those files. It does not perform service-specific schema validation, but it is useful for catching indentation and parsing issues before you run those tools.

What happens if my YAML contains an error?

The tool returns an error state with the parser message so you can fix the malformed section and try again. Common causes include inconsistent indentation, unclosed brackets, and invalid inline syntax.

YAML Validator

Validate YAML syntax instantly with parsed structure preview, clear error messages, and browser-based processing. Perfect for config files, CI workflows, infrastructure definitions, and frontmatter checks before deployment.

yaml

validator

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Quick Presets

Examples for yaml input workflows

YAML Input & Settings

Paste YAML and validate that it parses correctly before using it in config files or tooling.

Characters: 0

Lines: 0

Bytes: 0

JSON Indent

2 spacesCompact output for most API and config use4 spacesMore open spacing for manual inspection

How it works: This validator parses a YAML document locally in your browser, reports syntax errors, and shows a JSON preview of the parsed structure for quick inspection.

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