JSONPath Evaluator

What is JSONPath?

JSONPath is a query language for JSON, in the spirit of XPath for XML. An expression describes a route through the document, and evaluating it returns every value that route reaches. It is widely used in API testing tools, log pipelines, Kubernetes tooling and configuration systems.

JSONPath syntax

• $ — the root of the document.
• .property or ["property"] — a child property.
• [0], [-1:] — array index and slice.
• [*] — every element of an array or every property of an object.
• .. — recursive descent; $..id finds every id at any depth.
• [?(@.status=="active")] — a filter expression over each item.

Building an expression from the tree

The fastest way to write a correct query is to stop guessing at key names. Expand the tree, click the node you want, and copy its path — you will get something like $.data[3].preferences.theme. Replace the concrete index with [*] and you have a query that returns that field for every record.

Security note

Jsonviewpro evaluates expressions in a restricted, safe mode. Filter expressions work normally, but they are handled by a limited expression evaluator rather than the JavaScript engine: assignments, constructor calls and access to globals all fail. A query is data, never code.