YAML Validator

Detect indentation and syntax errors in your YAML configuration files.

About YAML Validator

YAML indentation issues driving you crazy? Use the Free YAML Validator. Rated as the Best YAML Validator online, it precisely pinpoints errors so you can confidently check yaml syntax before deploying.

Features

Strict YAML syntax validation against standard specs
Highlights the exact line number of the error
Catches common indentation and mapping mistakes
Fast, local processing for secure configs
Converts valid YAML to JSON for verification

How to Use

Paste your YAML code into the input field.
The tool will instantly validate it.
If invalid, an error message will show you the exact line to fix.
If valid, it will show a success message.

Frequently Asked Questions

What makes YAML invalid?

YAML relies strictly on spacing for structure. Mixing tabs and spaces, incorrect indentation levels, or unescaped colons are the most common errors.

Can I use tabs for indentation?

No! The YAML specification strictly forbids the use of tab characters for indentation. You must use standard spaces.

Is it safe to validate my Docker Compose file here?

Yes. The linter runs entirely in your browser using client-side JavaScript, making it perfectly safe for private DevOps configs.

Does it validate against a schema?

It checks structural syntax. It does not verify if your specific keys (like "image" or "ports") are correct for a specific application.

Why is YAML validation difficult?

YAML relies on strict spacing and indentation, making it easy to accidentally break the hierarchy.

Will it catch trailing spaces?

Yes, it can highlight syntax errors caused by invisible trailing characters or tab mixing.

Does it support YAML 1.2?

Yes, the validator uses standard parsing rules compatible with modern YAML environments.

Is this a free yaml validator?

Yes, you can use this free yaml validator for all your configs.

Why is it the best yaml validator?

Because it gives exact line numbers when you check yaml syntax errors.

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