Filter expression with bracket notation

Setup

Selector: $[?(@['key']==42)]

[
    {"key": 0},
    {"key": 42},
    {"key": -1},
    {"key": 41},
    {"key": 43},
    {"key": 42.0001},
    {"key": 41.9999},
    {"key": 100},
    {"some": "value"}
]

Results

Consensus

[
  {
    "key": 42
  }
]

Other responses

Bash (JSONPath.sh)

[]

C (json-glib)

Not supported

Unable to compile selector `$[?(@['key']==42)]': Invalid array index definition “?(@['key']==42)]”

Elixir (jaxon)

[]

Golang (github.com-PaesslerAG-jsonpath) ¹

Not supported

parsing error: $[?(@['key']==42)]	:1:7 - 1:12 could not parse string: invalid syntax

Kotlin (com.nfeld.jsonpathkt) ¹

Not supported

Unexpected char, char=?, index=2

Python (jsonpath-ng)

Not supported

JsonPathLexerError('Error on line 1, col 2: Unexpected character: ? ')

Python (jsonpath-rw)

Not supported

JsonPathLexerError('Error on line 1, col 2: Unexpected character: ? ')

Python (jsonpath2)

Not supported

line 1:6 token recognition error at: '''
ValueError("line 1:6 token recognition error at: '''")

Raku (JSON-Path)

Not supported

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

Rust (jsonpath)

Not supported

parsing error

Errors

Clojure (json-path) ¹

java.lang.Exception object must be an array.

Golang (github.com-oliveagle-jsonpath) ¹

interface conversion: interface {} is nil, not string

PHP (Goessner) ²

ArgumentCountError

Perl (JSON-Path)

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

Footnotes

• ¹ This implementation returns a single value where only one match is possible (instead of an array of a single value).
• ² This implementation returns a specific not found value if no match exists.
• ³ This implementation returns a specific not found value if a query that would regularly return a single match results in no match.