Some work on canvas html5

I need html5 developer with some experience with canvas (canvas itself or any free library who can help with presenting flow diagram on canvas shapes) we have palete of 8 shapes to use on canvas by drag and drop from palete to canvas then we got canvas (and whole canvas is saved as json model with shapes and arrows between them). i need to prepare this project in two steps. ALert - all data models are simply json assigned to variable in controller - soo we are not doing real save to db - we prototyping step 1 1 step - working prototype a) prepare module b) prepare directive to show palete of shapes c) prepare directive to show canvas from json model d) prepare directive for submit open canvas (submit by update model defined in controller variable) 2 step a) add work to visualization - make it looks nice (gradietns, hoovers, icons, buttons) b) pack all as bower package 3 step further evaluation and new features in next project. a) prepare endpoints or use endpoint prepared by local developer b) connection to endpoints with JWT security alone or with help with local developer c) if backend selfmade - then prepare npm instaler for that backend module