How can I implement registration on javascript/mongodb/express.js without using php?

Question

JavaScript

Explain, please, mechanisms of registration and session. I use express.js and mongodb and find articles with php/mysql

Answer 1

If you just need sessions, then there is a ready-made middleware https://github.com/expressjs/session , an example in readme.
passportjs.org is a ready-made solution for authorization / authentication on express (and not only), there are enough examples.