> +;; Note that `json-sexp-mode' inherits from `emacs-lisp-mode' since it's
for
> +;; editing JSON data as Elisp s-expressions.

It might be more appropriate to inherit from lisp-mode, which is parent to
emacs-lisp-mode. It should still provide all of the syntax definitions you
need without carrying a lot of key binds that don't make sense for your
mode (like eval-defun or eval-last-sexp).

I'm not sure which version of emacs added this mode, so you might have to
add a dependency on emacs 24.3 or something like that.