From a Django background which also provides form errors very easily, it seems at first glance that this would not be needed (and it technically isn't). Howeve

From a Django background which also provides form errors very easily, it seems at first glance that this would not be needed (and it technically isn't). However, it's often nice to the user to let them know of silly mistakes like passwords not matching or invalid emails before they hit submit and get bombarded with everything at once. Javascript validation provides convenience, not security.