Filter expression with equals with root reference

Setup

Selector: $.items[?(@.key==$.value)]

{"value": 42, "items": [{"key": 10}, {"key": 42}, {"key": 50}]}

Results

Consensus

[
  {
    "key": 42
  }
]

Other responses

Bash (JSONPath.sh) 

[]

C (json-glib)

Not supported

Unable to compile selector `$.items[?(@.key==$.value)]': Invalid array index definition “?(@.key==$.value)]”

Elixir (ExJsonPath)

Not supported

syntax error before: '$'

Elixir (jaxon) 

[]

Elixir (warpath) ¹

Not supported

Parser error: Invalid token on line 1, syntax error before: <<"$">>

Golang (github.com-oliveagle-jsonpath) ¹ 

[]

JavaScript (jsonpath) 

[]

Java (com.github.jsurfer)

Not supported

line 1:17 no viable alternative at input '@.key==$'
org.antlr.v4.runtime.misc.ParseCancellationException

Kotlin (com.nfeld.jsonpathkt) ¹

Not supported

Unexpected char, char=?, index=8

PHP (remorhaz-jsonpath) 

[]

PHP (softcreatr-jsonpath) 

[]

Python (jsonpath) ²

Not found

jsonpath returned false, this might indicate an error

Python (jsonpath-ng)

Not supported

JsonPathLexerError('Error on line 1, col 8: Unexpected character: ? ')

Python (jsonpath-rw)

Not supported

JsonPathLexerError('Error on line 1, col 8: Unexpected character: ? ')

Python (jsonpath2)

Not supported

line 1:16 extraneous input '=' expecting {'@', '$', 'true', 'false', 'null', '{', '[', STRING, NUMBER}
ValueError("line 1:16 extraneous input '=' expecting {'@', '$', 'true', 'false', 'null', '{', '[', STRING, NUMBER}")

Raku (JSON-Path)

Not supported

Evaluation of embedded Perl 6 code not allowed (construct with :allow-eval)

Ruby (jsonpath) 

[]

Rust (jsonpath)

Not supported

parsing error

Errors

JavaScript (jsonpath-plus) 

jsonPath: $ is not defined: @.key==$.value

PHP (Goessner) ² 

ArgumentCountError

Perl (JSON-Path) 

non-safe evaluation, died at main.pl line 11.

dotNET (JsonPathLib) 

$ is not defined

Footnotes