YAML to JSON Converter Online — Free

That is YAML itself: unquoted yes, no, on, off, true and false are booleans. If you actually want the string "yes" — a country code, a survey answer — quote it in the source: field: "yes". It then arrives in JSON as a string.

Yes. js-yaml resolves anchors during parsing, so the JSON carries the expanded value and the alias disappears — JSON has no way to express one. Block scalars written with | or > become plain strings with \n line breaks, and merge keys behave the same way.

Only a single document is parsed. A --- separator makes the parser stop, because JSON has no concept of a document stream. Split the file and run each section on its own, which is the usual approach with multi-part Kubernetes manifests.

Three causes cover most cases: a tab character instead of spaces, a missing space after a colon, and a nested key that drifted out of alignment. Paste the document in growing chunks; the section where the output disappears holds the error.

A bare 2026-09-06 parses into a Date and serialises to an ISO string with a time part and a trailing Z. Quote the value in the YAML if you need the literal text to survive unchanged.

Lines starting with # are dropped, because JSON has nowhere to keep them. Worth remembering when you convert a config for migration: the notes explaining each setting have to be preserved separately.