ghowkay

WP Code Editor with Syntax Highlighter is a must have plugin if you hate the plain text code editor in the wordpress admin panel. It converts it to a beautify code friendly editor and saves you any stress in using an external code editor.
Features: 
* Supports Xml, php, css, html, javascript 
* Matching tag functions 
* Matching bracket functions. 
* Code indentation. 
* Line numbering.

WP Code Eitor with Syntax Highlighter

This wordpress plugin converts the default plain text theme and plugins editor in wordpress to a pretty code editor.

alkanesolutions

Alkane Code is a user-friendly, lightweight code editor for TinyMCE that adds ‘language-‘ classes to HTML code elements. It can be used to add inline code as well as block code, and syntax highlighting at the front-end is performed using Prism.js with auto-loaded languages. It does not support the Gutenberg editor. You will need to install the ‘Classic Editor’ plugin to use this code editor.
More Information
<a href="https://www.alkanesolutions.co.uk/blog/2019/07/06/alkane-code-tinymce-code-editor-prism-syntax-highlighting/" rel="nofollow ugc">Alkane Code homepage</a>

Alkane Code

A TinyMCE code editor with Prism syntax highlighting.

WP Code Eitor with Syntax Highlighter vs Alkane Code