Dot notation with space padded key

Setup

Selector: $. a 

{" a": 1, "a": 2, " a ": 3, "": 4}

Results

Other responses

Bash (JSONPath.sh) 

[
  3
]

C (json-glib) 

[
  3
]

Clojure (json-path) ¹ 

2

Cpp (jsoncons) 

[
  2
]

Dart (json_path)

Not supported

FormatException: end of input expected at 1:2. Expression: $. a

Elixir (ExJsonPath) 

[
  2
]

Elixir (jaxon) 

[
  3
]

Elixir (warpath) ¹ 

2

Erlang (ejsonpath) 

[
  2
]

Golang (github.com-AsaiYusuke-jsonpath) ²

Not supported

invalid syntax (position=1, reason=unrecognized input, near=. a )

Golang (github.com-PaesslerAG-jsonpath) ¹ 

2

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

2

Golang (github.com-ohler55-ojg)

Not supported

Golang (github.com-oliveagle-jsonpath) ¹ 

3

Golang (github.com-spyzhov-ajson) 

[
  3
]

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

Not supported

child name missing at position 2, following "$."

Haskell (jsonpath)

Not supported

Invalid JSONPath: $. a 
 Error: 1:3:
  |
1 | $. a 
  |   ^
unexpected space
expecting '.' or white space

JavaScript (Goessner) ² 

[
  3
]

JavaScript (brunerd)

Not supported

JavaScript (jsonpath)

Not supported

Lexical error on line 1. Unrecognized text.
$. a 
--^

JavaScript (jsonpath-plus) 

[
  3
]

Java (com.github.jsurfer) 

[
  2
]

Java (com.jayway.jsonpath) ¹ ³

Not supported

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
com.jayway.jsonpath.InvalidPathException: Could not parse token starting at position 2

Kotlin (com.nfeld.jsonpathkt) ¹ 

1

Objective-C (SMJJSONPath) ¹ ³

Not supported

Could not parse token starting at position 2

PHP (Goessner) ² 

[
  3
]

PHP (galbar-jsonpath) ²

Not supported

Invalid JSONPath error: 'Error in JSONPath near '. a ''

PHP (remorhaz-jsonpath)

Not supported

Error: 'Failed to build AST from JSONPath query: $. a '

PHP (softcreatr-jsonpath)

Not supported

Error: 'Unable to parse token  a in expression: . a'

Perl (JSON-Path) 

[
  3
]

Python (jsonpath) ² 

[
  3
]

Python (jsonpath-ng) 

[
  2
]

Python (jsonpath-rw) 

[
  2
]

Python (jsonpath2) 

[
  2
]

Raku (JSON-Path)

Not supported

JSON path parse error at position 1

Ruby (jsonpath) 

[]

Rust (jsonpath)

Not supported

parsing error

Rust (jsonpath_lib)

Not supported

path error: 
$. a 
^^

Scala (jsonpath) 

[
  2
]

Swift (Sextant)

Not supported

NOT_SUPPORTED

dotNET (Json.NET)

Not supported

Unexpected character while parsing path:

dotNET (JsonCons.JsonPath) 

[
  2
]

dotNET (JsonPath.Net) 

[
  1
]

dotNET (JsonPathLib) 

[
  3
]

dotNET (Manatee.Json)

Not supported

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

JSON (Path_Reference_Implementation)

Not supported

 --> 1:3
  |
1 | $. a 
  |   ^---
  |
  = expected childName

Proposal (A)

Not supported


x 1:3-1:3 DotChildName
| $. a 
|   ^
x 1:2-1:2 DotChild
| $. a 
|  ^
x 1:2-1:2 Operator
| $. a 
|  ^
o 1:1-1:2 Start
  $. a 
  ^

Errors

Rust (jsonpath_plus) 

Error Parsing JSON Path:
$. a 
panic occurred

Footnotes