This type of question is more important for people looking to get started in web / app development. Since you are already writing Django apps, then don't worry

This type of question is more important for people looking to get started in web / app development. Since you are already writing Django apps, then don't worry about it. Most likely what will happen is that you will run into a project which will force you to learn JS and you will be able to pick it up quickly. Just keep building. Don't get sidetracked with tools you haven't had a need for yet. However, if you really want to get your hands dirty in JS and you aren't spending much time in the front-end, then perhaps you could build a service on NodeJS which handles part of your application.