How to create global variables accessible in all views using Express / Node.JS?

Question

Ok, so I have built a blog using Jekyll and you can define variables in a file _config.yml which are accessible in all of the templates/layouts. I am currently

Answer 1

With the differents answers, I implemented this code to use an external file JSON loaded in "app.locals"

Parameters

{
    "web": {
        "title" : "Le titre de ma Page",
        "cssFile" : "20200608_1018.css"
    }
}

Application

var express     = require('express');
var appli       = express();
var serveur     = require('http').Server(appli);

var myParams    = require('./include/my_params.json');
var myFonctions = require('./include/my_fonctions.js');

appli.locals = myParams;

EJS Page

Hoping it will help