This is Webeditor from CKeditor5.
I installed "build type web editor" and added web editor plugins.
git clone https://github.com/geontark/web-ckeditor5.git
cd web-ckeditor5
vim ./custom_plugin/index.js
WRITE consts infomation
ex) consts.imageUploadUrl -> "https://localhost:3000/api/upload"
consts.domain -> "https://localhost:3000"
npm install
npm run build
OPEN index.html in browser