2026-04-24 · 読了目安 1 分
JSON vs. YAML: Data Formats
JSON is for APIs; YAML is for humans.
JSON (JavaScript Object Notation) is the de-facto standard for web APIs.
YAML (YAML Ain't Markup Language) is preferred for human-readable configuration files.
この比較の見方
Choosing the right format can improve developer experience and system stability.
| アプローチ | データ処理 | 一般的な速度 | 適した用途 |
|---|---|---|---|
| JSON | Strict syntax, no comments, native JS support | Extremely fast parsing in almost all languages | REST APIs, data interchange, simple configs |
| YAML | Indentation-based, supports comments, complex types | Slower parsing; more complex specification | Kubernetes configs, CI/CD pipelines, complex app settings |
要点
- Use JSON for machine-to-machine communication.
- Use YAML for human-maintained configuration where comments are needed.