Can Dgraph’s visual interface be embedded during development?
Could you elaborate on how and where do you want to embed it? The platform on which you will be using it?
On my website，i want to use the visualization of nodes and their relationships
You should be able to take the client code from Ratel repo and tweak it as per your needs to fit in your website.
@paulftw can guide you more on this.
As @abhimanyusinghgaur has pointed out, Ratel code is licensed under the Apache License, Version 2.0 and hosted in a public github repo.