Paper.js vs Fabric.js

It is written in a language nearly identical to JavaScript, but adds helpful operator overloading to allow you to perform coordinate arithmetic.

An almost-unique feature: can test geometry if contains(), isInside() or intersects() one other object. Offers even hit-testing methods!

Objects in Paper make it easy to extend parent objects and run constructor functions without having to worry about JavaScript prototypal inheritance. Because of this it is easy to make compound drawing objects with their own instance variables and behaviors.

Example: each swimming tadpole follows its own behavior

These features make it easier to create objects that can act autonomously with complex behaviors. This makes Paper a good choice for particle effects and game development.

Elements all have the option of being created with a hash of properties which promotes clean, concise, and contextually local coding practice.

Paper uses a frame based approach to rendering the canvas. This makes it conceptually easier to create objects with animations and behaviors that interact and perform with other objects.

Along with Paper's approach to creating and managing objects this makes Paper especially good for creating applications with complex behaviors with many elements doing different actions at once, and makes it a good choice for making games.

Fabric supports node.js, and has an npm package available for server side rendering with all the dependencies handled for you. This allows you to provide graceful degradation for image fallbacks to canvas or SVG content.

Drawing objects in fabric are vector focused, so everything is easily transformable. It makes it easy to create complex pathed shapes, add gradients, or filters. Although fabric is great for vector rendering, it also has image support as well.

When it comes to format compatibility, Fabric is the best, with the ability to output to Canvas, SVG, and JSON. SVG provides backwards compatibility for older browsers, and JSON allows you to store rendered output for later use.

If you are about to customize the library to your needs, this is the project of choice! Great programming work!

Allows creating multi-line text that can even be interactively edited by user interaction.

If the node-canvas dependency is a problem you can now look for npm install fabric@x.y.z-browser