JSON を YAML に変換する方法

问题

JSON の設定があり、より簡潔で人が読みやすい YAML に変換したい。

前提条件

• JSON の理解
• YAML 構造への習熟

ステップ

1. 1. Parse and validate the JSON

   First parse the JSON to ensure it is valid. Invalid JSON will produce a conversion error. The parser creates an in-memory object that the YAML serializer can work with.

   入力

   {"port":8080,"debug":true}

   输出

   parsed object

2. 2. Serialize to YAML

   Convert the parsed object to YAML format. YAML uses indentation instead of braces and quotes. Strings do not need quotes unless they contain special characters. Arrays use dashes, and objects use key: value pairs.

   入力

   {"port":8080,"debug":true}

   输出

   port: 8080\ndebug: true

3. 3. Verify the conversion

   Check that the YAML output is valid by parsing it back and comparing with the original JSON. Watch for type coercion: YAML interprets unquoted values like yes/no/on/off as booleans. Quote strings that could be misinterpreted.

   入力

   YAML output

   输出

   round-trip matches original

期待される結果

元の JSON と等価で、正しい型とインデントを備えた有効な YAML ドキュメント。

よくあるエラー

YAML interprets a string as a boolean or number

Quote values that could be misinterpreted (e.g., 'yes', '3.14', 'null'). YAML 1.1 is especially aggressive with type coercion.

Indentation errors in the YAML output

YAML requires consistent indentation (spaces, not tabs). Use a converter that produces consistent 2-space indentation.

トラブルシューティング指引

• If the round-trip fails, check for YAML type coercion issues. Quote ambiguous strings.
• Tabs are not allowed in YAML indentation. Ensure the converter uses spaces.

セキュリティ上の制限

• YAML can be unsafe to parse if the parser supports tags like !!python/exec. Use a safe loader that ignores custom tags.