YAML rules explained

YAML 1.2 validation without hidden assumptions

Understand schemas, duplicate keys and multi-document streams.

Schema6 min read

YAML 1.2 core schema: strings, numbers, booleans and null

See why naming the schema prevents YAML 1.1 surprises such as yes becoming true.

Mappings6 min read

Do not rely on a parser silently keeping the first or last value.

Streams6 min read

Validate every document separated by --- rather than stopping after the first.