YAML Validator

Validate and format YAML files instantly. Check syntax, indentation, and structure with detailed error reporting.

Enter YAML Content
Lines: 1 | Characters: 0
YAML Syntax Guide

Basic Rules

  • • Use spaces for indentation (2 spaces recommended)
  • • Never use tabs for indentation
  • • Key-value pairs use "key: value" format
  • • Lists use hyphens (- item)
  • • Comments start with #

Common Errors

  • • Inconsistent indentation
  • • Missing space after colon
  • • Unescaped special characters
  • • Mixing tabs and spaces
  • • Incorrect list formatting
YAML Examples

Simple Key-Value Pairs

name: "John Doe"
age: 30
city: "New York"

Nested Objects

person:
  name: "Jane Smith"
  details:
    age: 25
    occupation: "Engineer"

Lists/Arrays

fruits:
  - "apple"
  - "banana"
  - "orange"
  
numbers: [1, 2, 3, 4, 5]
Key Features
YAML syntax validation
Indentation checking
Error reporting
YAML formatting
Minify support
Sample data
Copy to clipboard
Mobile-friendly interface
Why use a YAML validator?

YAML validation is essential for configuration files, deployment scripts, and application settings. Developers use it for validating Kubernetes configurations, Docker Compose files, and CI/CD pipelines. DevOps engineers use it for infrastructure as code and automation scripts. System administrators use it for server configurations and application settings. Our validator provides comprehensive syntax checking, indentation validation, and detailed error reporting, making it perfect for development, DevOps, system administration, and configuration management.

Key Benefits
1
Validate YAML syntax instantly
2
Check indentation and structure
3
Detailed error reporting with line numbers
4
Format and minify YAML files
5
Sample data for testing
6
Copy results to clipboard
7
Mobile-optimized interface
8
Free to use with unlimited validations
How to validate YAML - Step by step
1
Enter YAML content in the input area
2
Click 'Validate YAML' to check syntax
3
View validation results and errors
4
Check error line and column numbers
5
Use formatted YAML for corrections
6
Load sample data for reference
7
Minify YAML to remove comments
8
Copy formatted result to clipboard
YAML Best Practices

Indentation: Use 2 spaces consistently throughout the file. Comments: Use # for comments to document complex configurations. Keys: Use descriptive, consistent naming conventions. Values: Quote strings with special characters. Lists: Use consistent formatting for array items. Structure: Keep logical grouping and hierarchy clear. These practices ensure readable and maintainable YAML files.

Common YAML Use Cases

Kubernetes: Pod, service, and deployment configurations. Docker Compose: Multi-container application definitions. CI/CD: GitHub Actions, GitLab CI configurations. Configuration: Application settings and environment variables. Infrastructure: Terraform and Ansible configurations. Each use case requires specific YAML patterns and best practices.

YAML vs Other Formats

vs JSON: YAML is more readable, supports comments, less verbose. vs XML: YAML is simpler, more human-friendly, less syntax overhead. vs TOML: YAML supports more complex structures, better for nested data. vs INI: YAML supports hierarchical data, more expressive. YAML strikes a balance between readability and functionality for configuration files.

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