I'm currently using chart.js in my project and I have to say it's an amazing library. However I recently realised I also need a "treemap" which I was unable to find on their website. Has anyone managed to implement a treemap example using chart.js?
Chart.js is great, but has small number of chart types. Chart.js is lib to use provided charts, not to create own chart types.
D3.js is lib for producing data visualizations. See examples. You can find few treemap examples (i.e. this or this) done with d3.js