for-async2.js

const fs = require("fs")

async function read(fname) {
    return new Promise( (resolve, reject) => {
        fs.readFile(fname, (err, content) => {
            if(err) return reject(err)
            resolve(content.toString())
        })
    })
}



(async () => {
    let files = ['file2.json', 'file2.json']

    for(fname of files) {
        let fcontent = await read(fname)
        console.log(fcontent)
        console.log("-------")
    }

    for(idx in files) {
        let fcontent = await read(files[idx])
        console.log(fcontent)
        console.log("-------")
    }
})()