Just installed on WordPress 5.1 to replace Crayon and had no problems, especially with Crayon compatibility enabled. It does require a little work to clean up minor formatting problems caused by the switch, but that's generally not a problem. It is also missing a few languages that Crayon has, but highlight.js is fairly configurable in that regard.

Great job! The UI is a little rudimentary but you've done a great job in a nice clean implementation of the highlight.js library in WordPress. Congrats!

Really great plugin, hope the development and maintenance is long lasting! Keep up your good work!

nice plugin

I used to use Crayon Syntax Highlighter and is awesome too, but wp-code-highlightjs is better for my site and loads faster.

I'm so pleased I finally found a plugin that did exactly what I wanted. I tried a number of other syntax highlighting plugins, and they all fell short in one way or another. Thanks so much for this!