Wrap node style callback functions so it returns a promise.

callBackToPromiseWrapper.js

function promisewrapper(fn) {
    return (...args) => {
        return new Promise((resolve, reject) => {
            args.push((error, body) => {
                if (error) {
                    return reject(error);
                }
                return resolve(body);
            });
            fn(...args);
        });
    }
}

const fs = require('fs');

const readFile = promisewrapper(fs.readFile);
//const writefile = promisewrapper(fs.writeFile);

readFile('JsonData/yourfile.json', 'utf8').then(console.log.bind(console)).catch(console.error.bind(console));