Developer
YAML Formatter and Validator
Format and validate YAML 1.2 with line and column errors, multi-document support, and local browser processing.
YAML 1.2 parsing and formatting run locally in your browser. Anchors, aliases, comments, and multiple documents are supported. This checks YAML syntax, not Kubernetes, Docker Compose, CI, or application schemas.
How to use YAML Formatter and Validator
Best for
- Formatting YAML mappings, lists, and multiline strings before adding them to source control.
- Finding YAML syntax errors with line and column context.
- Checking anchors, aliases, comments, and multi-document YAML without uploading it.
Steps
- Paste YAML or load a mapping, multiline, anchor, or multi-document example.
- Choose Format to parse and rewrite valid YAML, or Validate to check syntax.
- Fix any reported line and column errors before copying the formatted YAML.
Notes
- The workspace uses a YAML 1.2 parser and supports multiple documents, anchors, aliases, and comments.
- Syntax validation does not prove that a Kubernetes, Docker Compose, CI, or application-specific schema is valid.
FAQ
Does YAML Formatter upload my YAML?
No. Formatting and common validation checks run in your browser.
What YAML features does the validator support?
It parses YAML 1.2 syntax, including multiple documents, anchors, aliases, comments, lists, mappings, and multiline strings. It does not validate application schemas.
Does it show where YAML is invalid?
Yes. Parser errors include line and column context so you can find syntax and indentation problems in the input.