tinymce-docs/plugins/code.md

layout	title	title_nav	description	keywords	controls
default	Code plugin	Code	Edit your content's HTML source.	wysiwyg source html edit	toolbar button, menu item

This plugin adds a toolbar button that allows a user to edit the HTML code hidden by the WYSIWYG view. It also adds the menu item Source code under the Tools menu.

Example

tinymce.init({
  selector: "textarea",  // change this value according to your HTML
  plugins: "code",
  toolbar: "code",
  menubar: "tools"
});