Filter expression with less than

Setup

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

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

Results

Other responses

Bash (JSONPath.sh) 

[
  0,
  -1,
  41,
  41.9999,
  "43",
  "42",
  "41",
  "value"
]

C (json-glib)

Not supported

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

Clojure (json-path) ¹ 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

Cpp (jsoncons) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

Dart (json_path) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

Elixir (ExJsonPath) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

Elixir (jaxon) 

[]

Elixir (warpath) ¹ 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

Erlang (ejsonpath) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

Golang (github.com-PaesslerAG-jsonpath) ¹

Not supported

parsing error: $[?(@.key<42)]	:1:10 - 1:11 unexpected "<" while scanning parentheses expected ")"

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

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  },
  {
    "key": "41"
  }
]

Golang (github.com-ohler55-ojg) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

Golang (github.com-oliveagle-jsonpath) ¹ 

[]

Golang (github.com-spyzhov-ajson) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

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

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

Haskell (jsonpath) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

JavaScript (Goessner) ² 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  },
  {
    "key": "41"
  }
]

JavaScript (brunerd) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  },
  {
    "key": "41"
  }
]

JavaScript (jsonpath) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  },
  {
    "key": "41"
  }
]

JavaScript (jsonpath-plus) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  },
  {
    "key": "41"
  }
]

JavaScript (jsonpathly) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

Java (com.jayway.jsonpath) ¹ ³ 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

Kotlin (com.nfeld.jsonpathkt) ¹

Not supported

Unexpected char, char=?, index=2

Objective-C (SMJJSONPath) ¹ ³ 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  },
  {
    "key": "41"
  }
]

PHP (galbar-jsonpath) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  },
  {
    "key": "41"
  }
]

PHP (remorhaz-jsonpath) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

PHP (softcreatr-jsonpath) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  },
  {
    "key": "41"
  }
]

Python (jsonpath) ² 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

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) 

[]

Python (python-jsonpath) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

Raku (JSON-Path)

Not supported

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

Rust (jsonpath) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

Rust (jsonpath_lib) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

Rust (jsonpath_plus) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

Rust (serde_json_path) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

Scala (jsonpath) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

Swift (Sextant) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  },
  {
    "key": "41"
  }
]

dotNET (JsonCons.JsonPath) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

dotNET (JsonPath.Net) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

dotNET (JsonPathLib) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  },
  {
    "key": "41"
  }
]

dotNET (Manatee.Json) 

[
  {
    "key": 0
  },
  {
    "key": -1
  },
  {
    "key": 41
  },
  {
    "key": 41.9999
  }
]

Errors

Java (com.github.jsurfer) 

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) 

comparison of String with 42.0 failed

dotNET (Json.NET) 

Input string was not in a correct format.

Footnotes