JSON vs YAML: Which Should You Use? (Honest Comparison)

The short answer

• Use JSON for machine-to-machine data exchange (APIs, storage).
• Use YAML for human-edited configuration (CI pipelines, Kubernetes manifests).

Readability

YAML wins on human readability — no quotes, no braces, indentation-based nesting. JSON is denser and more punctuation-heavy, but easier for machines to parse unambiguously.

Safety

JSON has fewer footguns. YAML's implicit type coercion (the famous "Norway problem" where NO becomes false) and indentation sensitivity make it surprisingly easy to introduce bugs.

Tooling

JSON is universally supported with no library required in browsers. YAML usually requires a third-party parser.

Bottom line

If a human edits the file regularly, YAML. If a machine writes it, JSON.

Need to convert between formats? Format your JSON first to make sure it's clean.