Readable output is only the start. A dependable review checks format syntax, exact data shape and the behavior of the ordinary consumer separately.
Compare structure, not indentation
Check every object key, array position, scalar type and exact number. Pay special attention to strings that resemble booleans, null or numbers; empty collections; large integers; exponent notation; Unicode; and comments intentionally omitted from YAML-to-JSON output.
Run the ordinary consumer
Use the destination parser with its actual schema, version and options. Validate any required fields and test a non-production fixture through the normal application path. Never treat a successful generic conversion as deployment approval or proof that application defaults remain the same.
The destination parser is authoritative
Keep the original, diff the complete output and parse the result with the exact library or application that will consume it. JSONYAML proves only that one bounded document fits its declared JSON-compatible profile. It does not validate a destination schema, environment substitution, application defaults, deployment behavior or semantic correctness.