Are nested objects sorted too?

Yes, with recursive sort enabled (default). Each object's keys are sorted independently.

Does it sort arrays of objects?

Array order is preserved unless you enable sort primitive arrays for string/number arrays only.

Recursively sort object keys in JSON for stable diffs, canonical output, and readable configs. Optional primitive array sorting.

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Recursive

Sort primitive arrays

JSON input

Sorted JSON

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Sort keys

{"z":1,"a":2,"m":3}

{"a":2,"m":3,"z":1}