I've created a few systems that had web code editors on them. One was a CMS based on C# MVC Razor, the users were technical themselves so editing HTML and some

I've created a few systems that had web code editors on them. One was a CMS based on C# MVC Razor, the users were technical themselves so editing HTML and some light C# was better for them than a WYSIWYG editor. Another was a data ingest pipeline system that allowed customization of stages via Javascript. The scripts were stored in a database and edited via a web page (again, it was a technical audience and very small scripts so a web editor made sense).