JSON Path

Free JSON Path calculator with clear step-by-step results.

About JSON Path

Normalises a JSONPath expression into unambiguous bracket notation, counts its depth and wildcards, and checks any numeric indices against an array size you supply. Bracket notation matters because dot notation cannot express keys containing dots, spaces or reserved characters.

Formulas

Depth

Depth = number of path segments after the root $

Bracket form

Each named segment becomes ['name']; each index stays [n]

Worked example

With the default values below, JSON Path returns Bracket notation equivalent of $['store']['book'][2]['author']. Change any input above and every figure here is recalculated in your browser.

Inputs used

JSONPath expression: $.store.book[2].author
Array size at the indexed levelminimum 0: 12

Results

Bracket notation equivalent: $['store']['book'][2]['author']
Path depth: 4 segments
Wildcard segments: 0
Index bounds check: All indices are within bounds

Step by step

1Values used
2Depth
3Bracket form
4Bracket notation equivalent= $['store']['book'][2]['author']
5Path depth= 4 segments
6Wildcard segments= 0
7Index bounds check= All indices are within bounds

Assumptions and limits

The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to whole numbers, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

When must I use bracket notation?

Whenever a key contains a dot, space, hyphen at the start, or any character that would break dot parsing. It is also required for keys that are purely numeric.

Are JSONPath indices zero-based?

Yes. [0] is the first element, so an array of twelve items has a maximum valid index of 11 - which is what the bounds check verifies.