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Validate YAML - YAML Validator & Syntax Checker

Validate YAML syntax online with comprehensive error checking, indentation validation, and structure analysis. Free YAML validator for configuration files, Docker Compose, Kubernetes manifests, and more.

Quick YAML Examples

YAML Information

📄 About YAML
• Human-readable data serialization standard
• Supports scalars, sequences, and mappings
• Uses indentation for structure (not tabs)
• Supports anchors & references for reuse

YAML Document to Validate

395 characters
Syntax: yaml

Output

Output will appear here

How It Works

Input Your Data

Paste, type, or upload your data directly into the validate yaml - yaml validator & syntax checker. All processing happens locally in your browser for complete privacy and security.

Configure Options

Customize the tool settings to match your specific needs. Real-time processing with instant validation and error detection.

Process Instantly

Click the process button or enable auto-processing for real-time results. Lightning-fast performance with immediate feedback and validation.

Export Results

Copy results to clipboard, download as files, or share with others. Multiple export formats available for maximum compatibility.

Frequently Asked Questions

How do I validate YAML syntax online?
Simply paste your YAML content into the validator, and it will instantly check for syntax errors, indentation issues, and structural problems. No installation required - everything runs in your browser.
What YAML features does the validator support?
The validator supports YAML 1.2 features including scalars, sequences, mappings, anchors, references, comments, and multi-document files.
How does indentation validation work?
The validator checks for consistent indentation, detects mixed tabs and spaces, and ensures proper nesting levels according to YAML standards.
Can it detect duplicate keys?
Yes, the validator can detect and flag duplicate keys within the same mapping, which is invalid in YAML and can cause parsing errors.
What is the difference between block and flow style?
Block style uses indentation and newlines (typical YAML), while flow style uses brackets and braces (similar to JSON). Both are valid YAML formats.
Does it validate data types?
The validator checks basic data type syntax and can identify strings, numbers, booleans, nulls, arrays, and objects in your YAML document.

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