Don't like ads? Go Ad-Free Today 

YAML Validator

DataDeveloper

ADVERTISEMENT · REMOVE?

INPUT

Auto Process

OUTPUT

Client Side

ADVERTISEMENT · REMOVE?

Guide

YAML Validator

Validate your YAML files instantly for syntax correctness. Paste your YAML content and get real-time feedback with detailed error messages including line numbers and column positions to help you quickly find and fix issues.

How to Use

1. Paste or type your YAML content into the input field.

2. The validator automatically checks your YAML as you type.

ADVERTISEMENT · REMOVE?

3. If the YAML is valid, you will see a green success message with the number of document lines.

4. If there are errors, you will see detailed information including the line number, column position, and a description of the problem.

5. Click “Try an example” to load a sample YAML document and see the validator in action.

Features

Real-time Validation – Automatically validates YAML as you type with no button clicks needed
Detailed Error Reports – Shows exact line numbers, column positions, and clear error descriptions
Syntax Highlighting – Color-coded success and error states for quick visual feedback
Line Count – Displays the number of lines in valid YAML documents
Example Loading – Try a comprehensive YAML example to test the validator

 FAQ

What is YAML and what is it used for?

YAML (YAML Ain't Markup Language) is a human-readable data serialization format commonly used for configuration files, data exchange between languages, and application settings. It is widely used in tools like Docker Compose, Kubernetes, Ansible, and CI/CD pipelines like GitHub Actions and GitLab CI.
What are the most common YAML syntax errors?

The most common YAML errors include incorrect indentation (YAML uses spaces, not tabs), missing colons after keys, improper nesting of mappings and sequences, unquoted special characters, and duplicate keys. Indentation errors are especially frequent since YAML relies on whitespace to define structure.
How does YAML differ from JSON and XML?

YAML is designed to be more human-readable than JSON or XML. Unlike JSON, YAML supports comments, multi-line strings, and does not require quotes around strings. Unlike XML, YAML has no closing tags. However, YAML is a superset of JSON, meaning valid JSON is also valid YAML.