YAML ecosystem / Comparison
JSON vs YAML: When to Use Each Format
A practical comparison of JSON and YAML for APIs, configs, Kubernetes manifests, CI pipelines and developer tooling.
The short version
JSON is stricter and more universal for APIs and browser tooling. YAML is easier for humans to read and comment, which is why infrastructure and CI tools often use it.
When JSON wins
Use JSON when data is moving through APIs, browsers, queues, tests or generated code. Strict syntax reduces ambiguity and makes parsing consistent.
When YAML wins
Use YAML when humans maintain configuration by hand, especially Kubernetes manifests, GitHub Actions, Docker Compose and environment-specific config. Convert to JSON when a tool or API requires machine-oriented data.