Ways to convert drawn curve to bezier points?

Is there a site/toolkit where I can draw out a bezier curve and it would output the vertices of the control/anchor points for me? Thanks!

I tried googling with “convert curve to bezier” “bezier automate”, but none showed what I want. Does everyone guess-estimate their own vector points?

P.S. new to p5.js here, no experience with processing before, but familiar with drawing curves and design software and the math behind it.

Google something like “fit bezier curve to points” instead. There certainly looks to be algorithm descriptions and code implementations, but not interactive apps… this is something you could do yourself in Processing.