JSON pointer implementation in Emacs Lisp. This is inspired by JSON::Pointer and Mojo::JSON::Pointer
Get element by path. json is decoded object by json.el.
(let ((json '((foo . 1)
(bar . [((qux . "hello")) 3])
(baz . ((boo . [1 3 5 7]))))))
(json-pointer-get json "/foo") ;; => 1
(json-pointer-get json "/bar/0") ;; => '((qux . "hello"))
(json-pointer-get json "/bar/0/qux") ;; => "hello"
(json-pointer-get json "/bar/1") ;; => 3
(json-pointer-get json "/baz/boo/2")) ;; => 55