Where JSON fits best
JSON is ideal for APIs, structured application data, and quick machine-to-machine exchange. It is strict, compact, and easy to validate.
{"service":{"name":"api","replicas":2}}Where YAML fits best
YAML is often better for config files and documentation snippets because it reads more like a hand-maintained document.
service: name: api replicas: 2
The practical tradeoff
JSON is stricter and easier to validate. YAML is friendlier to edit, but indentation mistakes can be subtle. Teams often use both: YAML for config and JSON for runtime data.