JSON Strict Prettifier (Sort Keys + Configurable Indent)
Standard JSON formatters output keys in insertion order. For diffing, version control, or reproducibility, you often want sorted keys — same data always produces the same string. This prettifier adds key sorting, configurable indent width / character, and optional pinned-first-key ordering for common fields like id and type.
How to use the JSON Strict Prettifier (Sort Keys + Configurable Indent)
Paste JSON. Configure indent width, optional key sorting, and any keys you want pinned to the top of every object (handy for putting id and type first). Output updates live.
Deterministic JSON pretty-printing
Most JSON formatters keep keys in insertion order, which means the same data can serialise two different ways depending on how it was built. That is fine for a quick read but bad for diffing, version control, and caching, where you want the same input to always produce byte-identical output.
This pretty-prints JSON deterministically: sort keys alphabetically, choose the indent width or character, and pin common fields like id, type, and name to the top of every object so the important keys stay where you expect. To check that the JSON is spec-clean before or after formatting, the strict JSON validator flags constructs a strict parser would reject.
Common use cases
- Stable diffs — sort keys so version-control diffs show only real changes.
- Reproducible output — get byte-identical JSON from the same data every time.
- Pin key fields — keep id, type, and name at the top of each object.
- Match a style — set indent width or tabs to fit a project convention.
- Cache keys — canonicalise JSON so it hashes consistently.