Implementing Flowchart using AngularJS and Canvas

I am trying to implement a flowchart using AngularJS and Canvas.
Instead of providing users with a UI where they can drag'n'drop UI components, I want to build a command line tool where users will be entering a command to draw a circle, which will convert command to a JSON object and render that object in canvas.

Are there any libraries which I can use to render UI components using JSON Object?