JSONPath Query Tester Guide
Test JSONPath expressions against any JSON — with filter expressions, wildcards, and recursive descent.
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Tags: JSONPath tester, JSONPath expression guide, JSON query tool
JSONPath Query Tester Guide The JSONPath specification (IETF RFC 9535) standardized the JSONPath query language in 2024. The original informal specification by Stefan Goessner remains at goessner.net/articles/JsonPath/. For JavaScript implementations, jsonpath-plus on npm is widely used. JSONPath syntax has been implemented in 150+ libraries across 40+ programming languages. JSONPath lets you extract any value from a JSON document with a single expression — no loops, no manual traversal, no code. Write and get every email address for active users in one shot. --- How JSONPath works? JSONPath was introduced by Stefan Goessner in 2007 as a JSON counterpart to XPath. The formal specification is RFC 9535 (published 2024). Every expression starts at the root () and walks the document tree…
Frequently Asked Questions
What is JSONPath?
JSONPath is a query language for JSON data, analogous to XPath for XML. It lets you select nodes from a JSON document using path expressions. The root of any document is represented by $, and you navigate using dot notation ($.a.b) or bracket notation ($['a']['b']).
How do I write a JSONPath expression?
Start with $ for the root, then use dots or brackets to navigate keys. Use [*] or .* for wildcards, [0] or [-1] for array indices, [start:end] for slices, and .. for recursive descent. Filter predicates go in square brackets as ?(@.field operator value).
What is the $ in JSONPath?
The dollar sign $ represents the root of the entire JSON document. Every valid JSONPath expression begins with $. The @ symbol refers to the current node being evaluated, used inside filter expressions like ?(@.price > 5).
How do I filter with JSONPath?
Use the filter operator ?() with @ representing the current element. For example, $.store.book[?(@.price < 10)] returns only books cheaper than 10. You can use ==, !=, <, >, <=, >=, and logical operators && and || inside filters.
What is recursive descent in JSONPath?
The .. operator searches all levels of the JSON tree, not just the immediate children. $..price finds every 'price' key anywhere in the document, regardless of nesting depth. It's useful but can be slow on very large documents.
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