config.js

//static data to don't have to generate the conf_adata 2 times
let config_data = null;
module.exports = function() {
// if the static data was already set. return it
    if (config_data != null && config_data != undefined) {
        return config_data
    }

    config_data = {}
//LOAD JSON
    if (process.env.NODE_ENV === undefined || process.env.NODE_ENV == null || process.env.NODE_ENV == 'development') {
        config_data = require('./config/config.development.json');
        console.log("... development");
    } else {
        config_data = require('./config/config.production.json');
        console.log("... production");
    }
//LOAD FROM ENV VARIABLES
    config_data.connection_string = process.env.connection_string;
    config_data.port = process.env.port || config_data.port;
    return config_data
}