> From: Philipp Stephani <p.stephani2@gmail.com>
> Date: Mon, 18 Dec 2017 20:59:39 +0000
> Cc: raman@google.com, emacs-devel@gnu.org
>
> -@defun json-parse-string string
> +@defun json-parse-string string &key (object-type 'hash-table)
>  This function parses the JSON value in @var{string}, which must be a
>  Lisp string.
>  @end defun
>
> -@defun json-parse-buffer
> +@defun json-parse-buffer &key (object-type @code{hash-table})

The first @defun needs the same change as you did in the second.

Otherwise, LGTM; thanks.