Selecting properties containing a square bracket seems to be impossible

[baltpeter]

Describe the bug

As far as I can tell (sorry if I'm missing something), it appears to be impossible to select properties that contain a square bracket ([]) in their name.

Code sample or steps to reproduce

Given the following JSON object:

{
  "abc": 2,
  "cd[DataLayer]": 1
}

I want to select the cd[DataLayer] property. These are the expressions I have tried (unsuccessfully):

$["cd[DataLayer]"]
$['cd[DataLayer]']
$.cd[DataLayer]
$.cd`[DataLayer]
$.cd`[DataLayer`]
$['`cd[DataLayer]']
$['cd`[DataLayer]']
$['cd`[DataLayer]`']
$[?(@.property == 'cd[DataLayer]')]
$.cd\[DataLayer\]
$.cd.DataLayer
$[`cd[DataLayer]]
$[cd[DataLayer]]

Console error or logs

No errors for any of the expressions listed above, but they all return an empty result ([]).

Expected behavior

I would expect there to be some expression that can select the cd[DataLayer] property.

As per the json-path-comparison project, $[']'] should return [42] for the input {"]": 42}, which fails in jsonpath-plus: https://cburgmer.github.io/json-path-comparison/results/bracket_notation_with_quoted_closing_bracket_literal.html#JavaScript_jsonpath-plus

Expected result

[
  1
]

Environment (IMPORTANT)

• Locally using JSONPath-Plus version: 7.2.0
• And on the demo page

Desktop

• Firefox 132.0b5 on Ubuntu 24.04.1 LTS
• Node v20.7.0

[80avin]

While this certainly needs a fix, the workaround for this exact case is to use @property as

$[?(@property == 'cd[DataLayer]')]

It however fails if there is a ")" in the property name.

Note: Issue description mentions using $[?(@.property == 'cd[DataLayer]')]. However, @.property doesn't math the property name. It matches a "property" named property under current object ( @ )

check this demo for a working example.