Variable: js-indent-level
js-indent-level is a customizable variable defined in js.el.gz.
Value
4
Documentation
Number of spaces for each indentation step in js-mode.
Probably introduced at or before Emacs version 26.1.
Source Code
;; Defined in /usr/src/emacs/lisp/progmodes/js.el.gz
(defcustom js-indent-level 4
"Number of spaces for each indentation step in `js-mode'."
:type 'integer
:safe 'integerp)