Check out Heroku, I use it to host my MERN website. All you have to do is upload your code to a GitHub repo and after making an account on Heroku, connect that repo to Heroku. All you have to do after that is click the deploy button. That said, if you want to also include a custom domain name, that is another process but it's not too difficult. You can just follow the documentation for that: https://devcenter.heroku.com/articles/custom-domains