File system model for write, append, read, rename, unlink (delete). Commonly used features of the fs module include fs. readFile to read data from a file, fs. writeFile to write data to a file and replace the file if it already exists

fs.js

let fs = require('fs')

//write file
fs.writeFile('myFile.txt','NodeJs code in code sample', function(){
     console.log('File Create')
 })

//append file
fs.appendFile('myCode.txt','My code append \n',function(){
     console.log('File Appended')
 })

//readFile
fs.readFile('myCode.txt','utf-8',function(err,data){
     if(err) throw err;
     console.log(data)
 })

//renameFile
fs.rename('myCode.txt','myText.txt',function(err){
     if(err) throw err;
     console.log('File Renamed')
 })

//unlink or Delete file
fs.unlink('myText.txt',function(err){
     if(err) throw err;
     console.log('File Deleted')
 })