JSONPath Tester

JSONPath is a query language for JSON, in the same spirit as XPath for XML. It lets you navigate a JSON document with a short path expression and pull out exactly the values you want, without writing a program to walk the tree yourself. A path starts at the root ($) and then chains steps such as a property name, an array index, or a wildcard.

JSONPath is widely used in tooling: API test suites, log processors, configuration linters, and services such as Kubernetes and many monitoring tools accept JSONPath to select fields from structured data. Learning the handful of core operators covers the vast majority of real queries.

This tester evaluates an expression against the JSON you paste and shows every match, together with a result count and how long the evaluation took. Editing either the JSON or the expression re-runs the query automatically.

How evaluation works

• Start — the whole document is the initial match at $.
• Apply each step — every operator transforms the current set of matches into a new set. A wildcard can turn one match into many.
• Collect — once the path is exhausted, the remaining values are returned as the results.
• Recursive descent — .. searches every level of the document before the next operator is applied.

This tester implements the core operators listed below. Extended features such as slices and general filter predicates are not fully implemented, so a path that relies on them may not behave as a full JSONPath engine would.

1. Paste the JSON — Paste a document into the left panel, or click Example JSON for a sample.
2. Enter a path — Type an expression such as $.store.book[*].title, or pick an example chip.
3. Read the results — Matches appear with an index, a result count, and the evaluation time.
4. Iterate — Change the JSON or the expression and the query re-runs automatically.

If a path finds nothing, the panel reports "No matches found" rather than an error. Malformed JSON is reported separately with the parser's message.

Given this document:

{
  "store": {
    "book": [
      { "title": "Sayings of the Century", "price": 8.95 },
      { "title": "Moby Dick", "price": 8.99, "isbn": "0-553-21311-3" }
    ],
    "bicycle": { "color": "red", "price": 19.95 }
  }
}

The expression $.store.book[*].title returns the titles of every book, because [*] expands the array and .title selects the title from each element:

[0] "Sayings of the Century"
[1] "Moby Dick"

Swapping in $..price uses recursive descent to collect every price anywhere in the document, and $.store.* returns both children of store: the book array and the bicycle object.