How to add an ssl certificate to a MERN site?

Question

Node.js

There is a site. I want to add an ssl certificate for it. How to add a certificate correctly so that links with http and https work?
Which of the data below is generally required
I have in text form
1) Certificate
2) Root certificate
3) Intermediate certificate
4) Request for a certificate
5) Private key

The data was provided to me in reg.ru, I rent a vps server from them.

Answer 1

If the private key was also provided to you by reg. ru - remake without giving anything to anyone except CSP. Or use the automated and free option from Let`s Encrypt.
How to install the certificate - depends on the web server, it's easy to google. The standard solution in 2020 is to set up nginx as a reverse proxy, followed by your node, react or whoever you have.

Answer 2

digitalocean setup ssl certificate
in google

Answer 3

https://nodejs.org/en/knowledge/HTTP/servers/how-t...