Answers for "how to define local storage in nodejs"

use local storage on server with node

const LocalStorage = require('node-localstorage').LocalStorage,
localStorage = new LocalStorage('./scratch');

node-localstorage example

node-disk-storage a simple fast and secure local storage for nodejs, 
you can store any data using key and value, and then your data will be 
encrypt to be like this �+�)data|ZGF0YXxqb2huK2RvZV5eXiQwfDFd^^^$0|1

npm i node-disk-storage -S || yarn add node-disk-storage -S