Reading file in nodejs with use of module fs and path

const  fs = require("fs");
const path = require("path");

const fileUrl = path.join(__dirname, "test.txt");
fs.readFile(fileUrl,(err,data)=>{
    console.log("fileData: ",data)
});

const  fs = require("fs");
const path = require("path");

const fileUrl = path.join(__dirname, "test.txt");
const fileData = fs.readFileSync(fileUrl);
console.log(fileData )