JSONPath Evaluator
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Full JSONPath syntax support

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Common questions answered

What is JSONPath?

JSONPath is a query language for extracting values from JSON documents, similar to XPath for XML. Using expressions like $.store.book[*].author, you can navigate nested structures, filter arrays, and select specific fields without writing code. JSONPath is supported by many languages and tools, making it a portable skill for working with JSON data.

This evaluator lets you type a JSONPath expression and see matching results in real time. It supports recursive descent (..), array slicing ([0:3]), filter expressions ([?(@.price < 10)]), and wildcard matching (*). Results are highlighted in the original document so you can see exactly which nodes match.

// Data
{"store":{"book":[
  {"title":"A","price":8},
  {"title":"B","price":12},
  {"title":"C","price":6}
]}}

// Query: $.store.book[?(@.price<10)]

[
  {"title":"A","price":8},
  {"title":"C","price":6}
]

// 2 matches found

Get the most out of this tool

• Use $..[fieldName] for recursive descent — it finds all instances of a field name regardless of nesting depth.
• Array slicing [start:end] follows Python convention: [0:3] returns the first three elements (indices 0, 1, 2).
• Filter expressions like [?(@.active == true)] let you select array elements matching a condition without writing code.

JSONPath: querying JSON like XPath for XML

JSONPath is a query language for JSON, analogous to XPath for XML. Created by Stefan Goessner in 2007 and formalized in RFC 9535 (2024), JSONPath lets you select specific values from a JSON document using path expressions. Instead of navigating a parsed object programmatically in code, you write a compact expression that describes the location of the values you want. This is powerful for filtering arrays, extracting nested values, and selecting values matching conditions.

A JSONPath expression starts with $ representing the root of the document. From there, you use dot notation to navigate object keys ($.store.book) or bracket notation ($['store']['book']). The wildcard * matches any key or array element — $.store.book[*] selects all books. The recursive descent operator .. searches at any depth — $..author finds all "author" values anywhere in the document, no matter how deeply nested.

Array subscripts enable precise element selection. $[0] selects the first element. $[-1] selects the last. $[0:3] is a slice selecting the first three elements (Python-style slice notation). $[0,2,4] selects elements at indices 0, 2, and 4. These subscript forms can be combined with recursive descent and wildcards for powerful multi-level queries like $.store.book[*].author which selects all author fields from all books.

Filter expressions are the most powerful JSONPath feature. The syntax $[?(@.price < 10)] selects array elements where the price field is less than 10. @ refers to the current element being tested. You can use comparison operators (<, >, <=, >=, ==, !=), and the in operator for membership tests. Filter expressions enable query-like data extraction directly from JSON without writing code: $..book[?(@.isbn)] selects only books that have an ISBN field.

JSONPath implementations exist in every major programming language: Python (jsonpath-ng, jsonpath-rw), JavaScript (@jsonquerylang/jsonpath, jsonpath-plus), Java (Jayway JsonPath), PHP (Flow\JSONPath), Ruby (jsonpath), Go (gjson, jsonpath). The expressions are portable across implementations with minor syntax variations. RFC 9535 standardizes the syntax to reduce ambiguity between implementations — this tool follows the RFC 9535 standard.

Practical applications of JSONPath span many domains. Kubernetes controllers use JSONPath expressions to extract specific fields from resource status objects. AWS CloudFormation and Step Functions use JSON-based query expressions derived from JSONPath. Postman test scripts use JSONPath to extract values from API responses for assertions. GitHub Actions uses path expressions to extract data from API responses in workflow files. Learning JSONPath pays dividends across all these platforms.

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