To check out / research
Write authorization logic like Firebase Security Rules https://www.osohq.com/
allow(user: User, "view", todo) if
user.country = todo.creator.country;
Microservices with batteries and chargers included https://github.com/dashersw/cote
JSON Web * (tokens, encryption, signatures, ...) library https://github.com/panva/jose
Bindings for libcurl in Node. HTTP, FTP, IMAP, LDAP, POP3, SMTP, ... gota go fast. https://github.com/JCMais/node-libcurl