JavaScript simple mindmap

I would like to have a some easy to use mindmap system, which is designed and developed in js. It uses ajax to auto save (I will write the php to save the data to the database. You can use any open source systems. Furthermore you should just have to click and drag from any node to create a new node. This should be as simple as possible. You can use https://www.mindmup.com/
Which is open source and free to use. But has a bit of a complex layout. Look at https://www.goconqr.com/ for a simpler layout.