Json - get count of elements

Question

Emacs 26.1 Here json file:

[
  {
    "id": 11,
    "name": "my name"
  },
  {
    "id": 22,
    "name": "my name3"
  },
  {
    "id": 33,
    "name": "my name3"
  }
]

As you can see the count of elements are 3. Nice. Is it possible to get count of elements? Suppose I has large json and I need to get count of elements? Maybe has some method that can do this.

P.S. Structure of one item is:

{
    "id": xx,
    "name": "xxxx"
  }

Answer 1

You can use json-read function

json-read is a compiled Lisp function in json.el.

Parse and return the JSON object following point. Advances point just past JSON object.

like this

(save-excursion
  (goto-char (point-min))
  (length (json-read)))

Answer 2

Here my custom function:

(defun json-count-elements ()
  (interactive)
  (save-excursion
    (goto-char (point-min))
    (message "Count of json elements: %d" (length (json-read)))))