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YAML Validator

Validate and format YAML with line-numbered errors and a tree view. Includes Docker and Kubernetes samples. Free, no sign-up.

How It Works

1

Paste or type YAML

Enter YAML in the editor. Validation happens in real-time as you type.

2

Check for errors

Errors show the exact line and column. Valid YAML displays a green indicator and parsed tree view.

3

Format or load samples

Auto-format to fix indentation. Load Docker Compose, GitHub Actions, or Kubernetes samples to test.

FAQ

YAML 1.2 via the js-yaml library, which is the current standard used by most tools and platforms.
Common issues: inconsistent indentation (mixing tabs and spaces), missing colons, or unquoted special characters.
This tool validates YAML syntax, not Kubernetes schema. For schema validation, use kubectl --dry-run or a dedicated K8s linter. Need to convert between JSON and YAML? Use the JSON-YAML converter.

Built & Maintained by Varstatt

Varstatt is a one-person product studio run by Jurij Tokarski, product engineer since 2011. These tools are free and open — no signup, no catch.