Starting with node 8.0.0, you can use this:

const fs = require('fs');const util = require('util');const readdir = util.promisify(fs.readdir);async function myF() {  let names;  try {    names = await readdir('path/to/dir');  } catch (err) {    console.log(err);  }  if (names === undefined) {    console.log('undefined');  } else {    console.log('First Name', names[0]);  }}myF();

See https://nodejs.org/dist/latest-v8.x/docs/api/util.html#util_util_promisify_original

Native support for async await fs functions since Node 11

Since Node.JS 11.0.0 (stable), and version 10.0.0 (experimental), you have access to file system methods that are already promisify'd and you can use them with try catch exception handling rather than checking if the callback's returned value contains an error.

The API is very clean and elegant! Simply use .promises member of fs object:

import fs from 'fs';const fsPromises = fs.promises;async function listDir() {  try {    return fsPromises.readdir('path/to/dir');  } catch (err) {    console.error('Error occured while reading directory!', err);  }}listDir();

Node.js 8.0.0

Native async / await

Promisify

From this version, you can use native Node.js function from util library.

const fs = require('fs')const { promisify } = require('util')const readFileAsync = promisify(fs.readFile)const writeFileAsync = promisify(fs.writeFile)const run = async () => {  const res = await readFileAsync('./data.json')  console.log(res)}run()

Promise Wrapping

const fs = require('fs')const readFile = (path, opts = 'utf8') =>  new Promise((resolve, reject) => {    fs.readFile(path, opts, (err, data) => {      if (err) reject(err)      else resolve(data)    })  })const writeFile = (path, data, opts = 'utf8') =>  new Promise((resolve, reject) => {    fs.writeFile(path, data, opts, (err) => {      if (err) reject(err)      else resolve()    })  })module.exports = {  readFile,  writeFile}...// in some file, with imported functions above// in async blockconst run = async () => {  const res = await readFile('./data.json')  console.log(res)}run()

Advice

Always use try..catch for await blocks, if you don't want to rethrow exception upper.