DevOps
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YAML Validator

Validate, format, and convert YAML files

YAML Input

10 lines
1
2
3
4
5
6
7
8
9
10

Parsed Structure

Validate YAML to see parsed structure

YAML Quick Reference

Key-Value Pairs:

key: value

Lists:

- item1
- item2

Nested Objects:

parent:
  child: value

Multiline Strings:

text: |
  Line 1
  Line 2
About YAML Validator

What is YAML Validator?

Validate YAML files with detailed error messages and line numbers. Format/prettify YAML with clean indentation, convert to JSON, and view the parsed structure as a collapsible tree.

Features & Benefits

  • Validate YAML with line-number error messages
  • Format and prettify with clean indentation
  • Convert YAML to JSON output
  • Collapsible parsed structure tree view
  • Copy or download formatted output
  • Handles complex YAML features: anchors, aliases, multi-line strings

Frequently Asked Questions

What YAML features are supported?
All YAML 1.2 features including anchors, aliases, multi-line strings, flow sequences, and nested mappings.
Why is my YAML invalid?
Common issues: inconsistent indentation (mixing tabs and spaces), missing colons, unquoted special characters, or incorrect nesting.
Can I convert YAML to JSON?
Yes. Click 'Convert to JSON' to see the equivalent JSON representation of your YAML.

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100% Private & Secure

This tool runs entirely in your browser. Your files and data never leave your device and are not uploaded to any server.