Validators
YAML Validator
Validate YAML syntax and find indentation, formatting, and structure errors directly in your browser.
Tool
Validate YAML syntax and find indentation, formatting, and structure errors directly in your browser.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this free YAML Validator to check YAML text for common syntax and formatting problems such as indentation errors, invalid mappings, broken lists, duplicate-looking keys, malformed strings, and incorrect nesting. The validation runs directly in your browser as a local syntax and structure check, but it may not catch every advanced YAML feature or parser-specific issue.
Examples
- name: Anna\nage: 32
- items:\n - id: 1\n - id: 2
Frequently Asked Questions
What does this YAML validator check?
It checks YAML syntax and common formatting issues, including indentation, lists, mappings, strings, and nested structures. It is not a complete YAML specification parser.
Why is YAML indentation important?
YAML uses indentation to define structure. Small spacing mistakes can change the meaning of the file or make it invalid.
Is my YAML uploaded?
No. The validation is designed to run locally in your browser.