"Why is there no Django/Rails equivalent in JavaScript world?"

Because there isn't enough time. Every twenty minutes there is a new framework. Things cannot mature. "AngularJS is now scheduled to reach the end of its life on December 31st, 2021." Time to learn yet another crappy soon to be EOF SPA junk language. People want html. People want a back button that works, people are sick of popups with CSS transitions - just show the information. Let my browser show html.