NodeJS - Global variable's value hasn't changed - node.js

Question

I want to implement a system in which if the user types domain/crypt/text (the page where the text gets crypted), the text is available to read in the main page (domain). I've found out the problem is that when I change the URL to check the main page datas gets resetted since I'm loading once again the page, but I can't find any solution to this problem.
const Encryption = require('node_triple_des');
const sha1 = require('sha1');
const express = require('express');
const app = express();
const key = "Chiave_scelta";
var coded_key = 'Coded_Key';
var text_crypted = 'NaN';
var text_decrypted = 'NaN';
async function encryptKey() {
coded_key = sha1(key); //si codifica la chiave scelta in SHA1
}
async function encryptAll(msg) {
await encryptKey();
var result = await Encryption.encrypt(coded_key,msg);
return result;
}
async function decryptAll(msg) {
await encryptKey();
var result = await Encryption.decrypt(coded_key, msg);
return result;
}
app.get('/', function (req, res) {
res.send('Generated key: ' + coded_key + '<br>' +
'Last crypted text: ' + text_crypted + '<br>' +
'Last decrypted text: ' + text_decrypted + '<br>'
)
})
app.get('/crypt/:code', async function (req, res) {
crypted_text = await encryptAll(req.params.code); //cripta il messaggio
res.send('Crypted text: ' + crypted_text )
})
app.get('/decrypt/:code', async function (req, res) {
decrypted_text = await decryptAll(req.params.code); //decripta il messaggio
res.send('Decrypted text: ' + decrypted_text )
})
app.listen(3000)

Answer 1

I fixed by importing the module 'local-storage' (which I previously installed).
const ls = require('local-storage');
To set values I used the following syntax:
ls.set(name,value);
To get values I used the following syntax:
ls.get(name,value);