Can you suggest a ready-made backend for small js applications?

Question

JavaScript

Greetings,
I often write all sorts of small landings, business cards and other husks. It's a shame to drag cms under them, it's too lazy to write your own backend because it smacks of cycling. Also, maybe some of you creatively got out of the situation, backend on Googledisk, for example :)
Requirements:
1. Something very simple and small with authorization and minimal work with the database, even on files.
2. It could be a baas that is free and won't close in a year :)

Answer 1

keystonejs.com just leave

Answer 2

firebase.com

Answer 3

mockjax.js