query_json

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Use this when you need to pull specific values out of a JSON document by JSONPath and getting the path exactly right on deeply nested or large structures matters. Evaluates a JSONPath subset — $ (root), .name or ['name'] (child), [n] (index, negative allowed), [*] (wildcard), .. (recursive descent), and [start:end] (slice) — and returns every matching value in document order. Prefer this over hand-walking nested JSON, where it is easy to miscount array indices or miss a deep match. Filter (?()) and script (()) expressions are not supported and are rejected with a message naming the supported subset. Deterministic: same input, same output. Example: path "$.store.book[-1].title" over {"store":{"book":[{"title":"A"},{"title":"B"}]}} -> matches ["B"], count 1.