Filter expression with triple equal

Setup

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

[
    {"key": 0},
    {"key": 42},
    {"key": -1},
    {"key": 1},
    {"key": 41},
    {"key": 43},
    {"key": 42.0001},
    {"key": 41.9999},
    {"key": 100},
    {"key": "some"},
    {"key": "42"},
    {"key": null},
    {"key": 420},
    {"key": ""},
    {"key": {}},
    {"key": []},
    {"key": [42]},
    {"key": {"key": 42}},
    {"key": {"some": 42}},
    {"some": "value"}
]

Results

Other responses

Bash (JSONPath.sh) 

[]

C (json-glib)

Not supported

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

Clojure (json-path) ¹ 

[
  {
    "key": null
  },
  {
    "some": "value"
  }
]

Cpp (jsoncons)

Not supported

JSON syntax_error at line 1 and column 15

Dart (json_path)

Not supported

Instance of 'ParserException': end of input expected (at 1:2)

Elixir (ExJsonPath)

Not supported

illegal characters "=4"

Elixir (jaxon) 

[]

Elixir (warpath) ¹ 

[
  {
    "key": 42
  }
]

Golang (github.com-PaesslerAG-jsonpath) ¹

Not supported

parsing error: $[?(@.key===42)]	:1:12 - 1:13 unexpected "=" while scanning extensions

Golang (github.com-bhmj-jsonslice) ¹ ³ 

[
  {
    "key": 42
  }
]

Golang (github.com-ohler55-ojg)

Not supported

Golang (github.com-oliveagle-jsonpath) ¹ 

[]

Golang (github.com-vmware-labs-yaml-jsonpath)

Not supported

invalid filter term at position 11, following "=="

Haskell (jsonpath)

Not supported

Invalid JSONPath: $[?(@.key===42)]
 Error: 1:12:
  |
1 | $[?(@.key===42)]
  |            ^^^^^
unexpected "=42)]"
expecting "false", "null", "true", '!', '"', '$', ''', '@', digit, or white space

JavaScript (Goessner) ² 

[
  {
    "key": 42
  }
]

JavaScript (brunerd) 

[
  {
    "key": 42
  }
]

JavaScript (jsonpath) 

[
  {
    "key": 42
  }
]

JavaScript (jsonpath-plus) 

[
  {
    "key": 42
  }
]

JavaScript (jsonpathly)

Not supported

mismatched input '' expecting {'@', '$', 'true', 'false', 'null', '{', '[', '(', NUMBER, STRING}

Java (com.jayway.jsonpath) ¹ ³ 

[
  {
    "key": 42
  }
]

Kotlin (com.nfeld.jsonpathkt) ¹

Not supported

Unexpected char, char=?, index=2

Objective-C (SMJJSONPath) ¹ ³ 

[
  {
    "key": 42
  }
]

PHP (galbar-jsonpath)

Not supported

Invalid JSONPath error: 'Error in JSONPath near '=''

PHP (remorhaz-jsonpath)

Not supported

Error: 'Failed to build AST from JSONPath query: $[?(@.key===42)]'

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 2: Unexpected character: ? ')

Python (jsonpath-rw)

Not supported

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

Python (jsonpath2)

Not supported

line 1:10 mismatched input '=' expecting {'@', '$', 'true', 'false', 'null', '{', '[', STRING, NUMBER}
ValueError("line 1:10 mismatched input '=' expecting {'@', '$', 'true', 'false', 'null', '{', '[', STRING, NUMBER}")

Python (python-jsonpath)

Not supported

JSONPathSyntaxError("unexpected token '='")

Raku (JSON-Path)

Not supported

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

Rust (jsonpath)

Not supported

parsing error

Rust (jsonpath_lib)

Not supported

path error: 
$[?(@.key===42)]
^^^^^^^^^^^

Rust (serde_json_path)

Not supported

at position 3, in long-hand segment, parser error

Scala (jsonpath)

Not supported

JPError(end of input expected)

Swift (Sextant) 

[
  {
    "key": 42
  }
]

dotNET (Json.NET) 

[
  {
    "key": 42
  }
]

dotNET (JsonCons.JsonPath)

Not supported

Expected function

dotNET (JsonPath.Net)

Not supported

Pattern '(@.key===4...' not recognized.

dotNET (JsonPathLib) 

[
  {
    "key": 42
  }
]

dotNET (Manatee.Json)

Not supported

Unrecognized JSON Path Expression element. Path up to error: '$'

Errors

Erlang (ejsonpath) 

Timeout

Golang (github.com-spyzhov-ajson) 

wrong symbol '=' at 9

Java (com.github.jsurfer) 

line 1:11 token recognition error at: '=4'
java.lang.NumberFormatException: Character " is neither a decimal digit number, decimal point, nor "e" notation exponential mark.

PHP (Goessner) ² 

ArgumentCountError

Perl (JSON-Path) 

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

Ruby (jsonpath) 

undefined method `=' for 0.0:Float
Did you mean?  =~
               ==

Rust (jsonpath_plus) 

Error Parsing JSON Path:
$[?(@.key===42)]
panic occurred

Footnotes