node-canvas
Node canvas is a Cairo backed Canvas implementation for NodeJS
... visit Mozilla Web Canvas API. (See Compatibility Status for the current API compliance.) All utility methods and non-standard APIs are documented. When MIME data is tracked, PDF canvases can embed JPEGs directly into the output, rather than re-encoding into PNG. This can drastically reduce filesize and speed up rendering. If working with a non-PDF canvas, image data must be tracked, otherwise the output will be junk.