The interrelation of vertices is sometimes difficult to understand when viewed from the console. The database can see how they relate to one another as can your application, but it isn’t always near so clear to the developer. The Graph Viewer provides a convenient visualization tool based on Canvas and WebGL, showing the vertices in a graph and the edges connecting them. It also provides an interface, allowing you to operate on the graph through the Web UI.
In the version 3.1 release of ArangoDB, the Graph Viewer underwent a significant update, improving performance and adding new features allowing it to handle much larger graphs than it could previously.