Fabric.js vs Snap.svg

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

Dmitry Baranovskiy also wrote Raphael (project now owned by Sencha), this is the updated modern version of that library. Dmitry also is a champion directly affecting the future of SVG standards with W3C

Adobe is backing the development of snap.svg

Supports the newest SVG features like masking, clipping, patterns, full gradients, groups, and more