YAMLフォーマッター

YAMLをフォーマット、検証、ミニファイし、JSONに即座に変換します。構造分析を備えたクライアントサイドのみ。

Action

インデント

結果

About YAML Formatter

Our YAML Formatter is a free online tool that formats, validates, minifies, and converts YAML documents instantly. Whether you're working with Docker Compose files, Kubernetes manifests, GitHub Actions workflows, or configuration files, this tool ensures your YAML is clean and valid. All processing happens entirely in your browser — your data never leaves your device.

Features

Format and beautify YAML with customizable indentation (2 or 4 spaces)
Minify YAML by removing unnecessary whitespace and comments
Validate YAML syntax and structure with detailed error reporting
Convert YAML to JSON with a single click
Structure analysis showing keys, objects, arrays, and nesting depth
One-click copy and download for formatted output
100% free, private, and client-side processing

How to Use

Paste or type your YAML document into the input area
Select the action you want: Format, Minify, Validate, or Convert to JSON
Choose your preferred indentation level (2 or 4 spaces)
Click the "Process YAML" button to see the results instantly
Use Copy or Download to save your formatted output

Common Use Cases

DevOps engineers formatting Kubernetes manifests and Docker Compose files
Developers validating GitHub Actions workflow files
System administrators cleaning up configuration files
Anyone converting YAML data to JSON for API consumption