Bracket notation with number -1 on empty array

Setup

Selector: $[-1]

[]

Results

Consensus

[]

Scalar consensus

The scalar consensus applies for implementations which return a single value where only one match is possible (instead of an array of a single value).

null

Not found consensus

This consensus applies for implementations which return a specific not found value if no match exists.

NOT_FOUND

Scalar not found consensus

This consensus applies for implementations which returns a specific not found value when a query that would regularly return a single match results in no match.

NOT_FOUND

Other responses

PHP (Goessner) ²

null

Raku (JSON-Path)

Not supported

JSON path parse error at position 1

Rust (jsonpath)

Not supported

parsing error

Errors

Clojure (json-path) ¹

java.lang.IndexOutOfBoundsException nil

Golang (github.com-PaesslerAG-jsonpath) ¹

index -1 out of bounds

Golang (github.com-oliveagle-jsonpath) ¹

index out of range: len: 0, idx: -1

Python (jsonpath-rw)

IndexError('list index out of range')

dotNET (Json.NET)

Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'index')

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.