Why convert JSON to YAML?

YAML is the standard format for configuration files in Docker, Kubernetes, GitHub Actions, and most CI/CD pipelines. Converting JSON to YAML makes it easier to use your data in DevOps workflows.

What's the difference between JSON and YAML?

JSON uses braces and brackets with strict syntax. YAML uses indentation (no braces), supports comments, and is generally easier to read. Both represent the same data structures — objects and arrays.

Does YAML support all JSON data types?

Yes. Every valid JSON value (strings, numbers, booleans, null, objects, arrays) has a YAML equivalent. YAML actually supports additional types like dates, but the converter sticks to JSON-compatible types.

How do I use the YAML output in a Docker Compose file?

Convert your JSON configuration to YAML, then copy the output directly into your docker-compose.yml file. Make sure the indentation is preserved — YAML is whitespace-sensitive.

JSON → YAML

設定・DevOps 向けに YAML へ変換

JSON入力

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YAML出力

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Move JSON config into YAML for DevOps tooling

Most cloud-native tools — Kubernetes, Docker Compose, GitHub Actions, Helm, Ansible — speak YAML, not JSON. Converting JSON to YAML gives you a comment-friendly, indentation-based file that's easier for humans to maintain while preserving the exact same data structure.

Use the converter when you need to

Generate a Kubernetes manifest

Build the structure as JSON in your code, then convert to YAML for a manifest you can apply with kubectl.

Author a CI workflow file

Many CI systems require YAML — convert JSON config snippets so they paste cleanly into .github/workflows or .gitlab-ci.yml.

Make a config file human-friendly

YAML supports comments and uses indentation instead of braces, which makes long configs easier to read and review.

How to convert JSON to YAML quickly

1
Paste the JSON document into the editor.
2
Click Convert to produce equivalent YAML with proper indentation.
3
Copy the YAML for use in a manifest, workflow file, or config repo.

Keep going

Convert YAML back to JSON

Reverse the process when a tool or API expects JSON instead.

Convert to XML

Use XML when integrating with SOAP services or legacy enterprise systems.

Format JSON before converting

Make the source easier to scan so the converted YAML structure is predictable.

Validate the source

Bad JSON in means bad YAML out — validate first to skip a debugging round.

Common JSON-to-YAML workflows

Deploy a service with a generated manifest

Build the config programmatically as JSON and emit YAML at the end of the pipeline.

Document API examples in YAML

Some docs systems prefer YAML for examples — convert request and response samples once and reuse.

Migrate config between formats

Move from a JSON-based config repo to a YAML-first one without retyping every value.

よくある質問

YAMLはDocker、Kubernetes、GitHub Actionsなど、多くのCI/CDパイプラインや設定ファイルで標準的に使われます。JSONをYAMLに変換すると、DevOpsのワークフローにそのまま組み込みやすくなります。

JSONは{}や[]を使う厳密な構文です。YAMLはインデントで構造を表し（波括弧なし）、コメントも書けて、一般的に読みやすい形式です。どちらもオブジェクトと配列という同じデータ構造を表現できます。

はい。JSONで有効な値（文字列、数値、boolean、null、オブジェクト、配列）はすべてYAMLに対応する表現があります。YAMLには日付など追加の型もありますが、このコンバーターはJSON互換の型に収めて変換します。

JSON設定をYAMLに変換し、出力を docker-compose.yml にそのまま貼り付けます。YAMLは空白（インデント）に意味があるため、インデントが崩れないよう注意してください。