JSON vs YAML — which format should you use?
JSON and YAML can represent the same data, but they serve different audiences. JSON is strict and ubiquitous for APIs; YAML is more human-friendly and dominates configuration files like Docker Compose and Kubernetes.
| Aspect | JSON | YAML |
|---|---|---|
| Syntax | Braces and quotes | Indentation, minimal punctuation |
| Comments | Not supported | Supported (#) |
| Readability | Good | Excellent for config |
| Error-proneness | Strict and predictable | Indentation mistakes can bite |
| Best for | APIs, data interchange | Config files, CI/CD, infrastructure |
The verdict
Use JSON for data sent between programs and APIs. Use YAML for configuration humans edit by hand, where comments and clean indentation help. Converting between them is trivial with the tools below.
Free tools for JSON and YAML
FAQ
Is YAML better than JSON?
For human-edited config, YAML is friendlier (comments, less punctuation). For machine-to-machine data, JSON is the standard.
Is all JSON valid YAML?
YAML is a superset of JSON, so valid JSON is generally valid YAML — but not the other way around.