Introduction D3.js it is a popular tool for Data Visualisation, I have spent a day to explore it and built a simple mind map application. The application structure is quiet simple: Back-end: Web API by Flask in Python Front-end: D3.js As the focus is mainly on trying the D3.js, so the web api doesn't come with any security implementation. In addition, the JavaScript code is not organised very well. I might improve the code in the future if I have some spare time. Key Feature of D3.js The only…