JSONPath tester and evaluator
Type an expression, see the matches immediately, each labelled with its full path. No run button, no server round-trip, and the grammar is documented rather than guessed at.
Open the query →Supported syntax
A practical subset rather than the full specification — this is the complete list, and the same table is available inside the app:
| Syntax | Meaning |
|---|---|
$ | the whole document |
.key | a property; use ['odd key'] when it contains spaces or dashes |
[0] | an array item; [-1] counts back from the end |
[1:4] | a slice; [:2] and [2:] also work |
.* or [*] | every child of an object or array |
..key | that property at any depth |
$..[?(…)] | any node anywhere matching the test |
$.list[?(…)] | the members of list matching the test |
@.field | a field of the node being tested |
== != > >= < <= | comparisons against a number, string, true/false or null |
=~ "re" | regular-expression match on a string |
[?(@.flag)] | nodes where the field is truthy |
Worked examples
$..id // every id, however deeply nested
$.items[0:3] // the first three items
$..[?(@.active == true)] // every active node anywhere
$..[?(@.name =~ "^ab")] // names starting with "ab"
$.users[-1].email // the last user's emailRecursive descent is descendant-or-self, so $..[?(…)] tests the root
as well as everything under it, and overlapping routes to the same node are reported once.
Not supported
Script expressions, unions of distinct paths ($['a','b']), parent navigation,
and functions such as length(). If an expression is invalid you get a message
saying why, not an empty result list that looks like "no matches".
Questions
What is JSONPath?
A query language for JSON, roughly what XPath is for XML. $ is the document root, dots and brackets walk into properties and array items, .. searches at any depth, and [?(…)] filters by a test.
How do I filter an array by a field value?
Use a filter expression: $.users[?(@.active == true)] returns the members of users whose active field is true. @ refers to the item being tested.
Why does my expression return nothing?
Usually a name that does not exist at that level, or a filter compared against the wrong type. Try the same path without the filter first, then add the test back — matches update as you type, so it is quick to narrow down.
Is the query run on a server?
No. Expressions are evaluated in a Web Worker in your browser, against the document you have open.