Use this free online YAML Validator to verify that your YAML document is syntactically correct and follows valid YAML structure. Paste your YAML into the editor or upload a YAML file, then run the validation to detect syntax errors, invalid indentation, malformed mappings, and other issues that may prevent the document from being parsed.
If you need to improve the layout and readability of your YAML, use our YAML Formatter to automatically format and organize your document.
YAML Validation Example Document
Valid YAML Document
The following YAML is valid because it uses consistent indentation, correctly formatted key-value pairs, and properly structured lists.
store:
name: Tech World
location: New York
products:
- id: 101
name: Laptop
category: Electronics
price: 850.00
- id: 102
name: Office Chair
category: Furniture
price: 120.00
- id: 103
name: Wireless Mouse
category: Accessories
price: 25.50
Invalid YAML Document
The following YAML is invalid because it contains inconsistent indentation, malformed key-value pairs, and incorrectly structured list items, preventing it from being parsed as a valid YAML document.
store:
name: Tech World
location New York
products:
- id 101
name: Laptop
category: Electronics
price: 850.00
- id: 102
name: Office Chair
category: Furniture
price: 120.00
id: 103
name: Wireless Mouse
category: Accessories
price: 25.50