YAMLCheck
Open validator

YAML 1.2 core

Private YAML validator and formatter

Paste one YAML stream, inspect every document and format it only when validation succeeds.

YAML source

Validate one bounded stream

Stays in this browser
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All documents are parsed with YAML 1.2 core rules. Duplicate keys are errors; anchors and aliases are counted.

The result cannot prove that another parser or application accepts the same configuration. Verify it in the real consumer.