JSONからYAMLコンバーター

ブラウザ内でJSONデータをYAML形式に即座に変換。無料、プライベート、サーバーアップロード不要。ファイルアップロード、検証、ダウンロードに対応。

JSON Input

.jsonファイルをドラッグ＆ドロップ、またはクリックして参照

オプション

インデント

引用符スタイル

YAML出力

About JSON to YAML Converter

JSON to YAML Converter is a free online tool that instantly transforms JSON data into clean, readable YAML format. All processing happens entirely in your browser — no data is ever sent to a server, ensuring complete privacy and security. Whether you are converting API responses, configuration files, or data schemas, this tool handles it all with customizable output options and detailed statistics.

Features

Instant Conversion — Transform JSON to YAML in real-time with a single click
File Upload — Drag and drop or browse to upload JSON files directly
JSON Validation — Built-in validation catches syntax errors before conversion
Custom Indentation — Choose between 2 spaces or 4 spaces for YAML output
Quote Style Options — Select single or double quotes for string values
Statistics Panel — View keys, arrays, objects, and output size at a glance
Copy & Download — One-click copy to clipboard or download as .yaml file
Preserves Data Types — Accurately converts numbers, booleans, nulls, and nested structures
Handles Large Files — Efficiently processes large JSON files without browser slowdown
100% Client-Side — No server uploads, your data stays private and secure

How to Use

Paste or type your JSON data into the input textarea, or drag and drop a .json file
Select your preferred indentation style (2 spaces or 4 spaces)
Choose your preferred quote style for string values (single or double quotes)
Click "Convert to YAML" to transform your JSON instantly
View the YAML output with syntax highlighting and detailed statistics
Use Copy or Download to save the result to your clipboard or device

Common Use Cases

Convert API configuration files from JSON to YAML for better readability
Prepare Kubernetes manifests and Docker Compose files from JSON templates
Convert data schemas and OpenAPI specs for documentation purposes
Migrate CI/CD pipeline configurations from JSON to YAML format
Convert game save data or app settings for easier manual editing
Transform JSON test data into YAML for testing frameworks that prefer YAML

Frequently Asked Questions

Is my JSON data safe when using this tool?

Yes, absolutely. All conversion happens entirely in your browser. Your JSON data is never sent to any server, ensuring complete privacy and security.

What is the difference between JSON and YAML?

JSON (JavaScript Object Notation) uses braces and quotes for structure and is great for machine parsing. YAML (YAML Ain't Markup Language) uses indentation and is more human-readable, making it popular for configuration files.

Does this tool support nested objects and arrays?

Yes, the converter fully supports nested objects, arrays, and complex data structures. It preserves the exact hierarchy and data types from your JSON input.

Can I upload a JSON file instead of pasting text?

Yes, you can drag and drop a .json file onto the drop zone or click to browse and select a file from your device. The tool will read the file and convert it instantly.

What is the difference between single and double quotes in YAML output?

YAML supports both single and double quotes for strings. Single quotes preserve literal text (no escape sequences), while double quotes allow escape sequences. The choice depends on your downstream use case.

Is there a file size limit?

There is no artificial size limit. However, extremely large files (hundreds of megabytes) may cause browser performance issues. For most practical use cases, the tool handles files of any reasonable size instantly.

Can I download the converted YAML as a file?

Yes, simply click the Download button and the result will be saved as a .yaml file. You can also use the Copy button to copy the YAML to your clipboard.

Does the converter handle special characters and unicode?

Yes, the converter properly handles Unicode characters, special symbols, emojis, and escape sequences from JSON, preserving them accurately in the YAML output.