https://summernote.org/examples/#codemirror-as-codeview
$(document).ready(function() {
$('.summernote').summernote({
height: 200,
tabsize: 2,
codemirror: {
CodeMirrorConstructor: window.CodeMirror,
mode: 'text/html',
htmlMode: true,
lineNumbers: true,
theme: 'monokai'
}
});
});