How to build a grid from nodes?

Question

JavaScript

Good afternoon, I need a manual that explains the principle of building something like this:
visjs.org/examples/network/nodeStyles/shadows.html
Not necessarily for canvas, it can be in general, for any other language, the main thing is that we have a lot of nodes, all they are connected, the nodes do not overlap, the nodes behave like in jelly.

Answer 1

in fact, this is a simulation of the physics of a flexible body, so to speak

Answer 2

I think that these pieces of code will help
https://bl.ocks.org/mbostock/4062045
bl.ocks.org/jose187/4733747 (easier example)