FS System ... Read And Write In txt ANd Json File

How to use the path module?

var path = require('path');
 path.normalize('/a/.///b/d/../c/')
'/a/b/c/'
// '.' for 'this directory' and '..' for 'one level up'


 var path = require('path');
 var url = '/index.html';
 path.join(process.cwd(), 'static', url);
'/home/nico/static/index.html'



 var path = require('path')
 var a = '/a/b/c.html'
 path.basename(a)
'c.html'
 path.extname(a)
'.html'
 path.dirname(a)
'/a/b'

 var path = require('path')
 var a = '/a/b/c.html'
 path.basename(a, path.extname(a))
'c'




 var path = require('path')
 path.exists('/etc', function(exists){console.log("Does the file exist?", exists)})
 Does the file exist? true

 path.existsSync('/etc')
    true

Read From Json File

var fs=require("fs");
console.log("Starting ...");
var content = fs.readFileSync("./config.json");
console.log("content :" + content );
var config = JSON.parse(content);
console.log("config :",config);
console.log("username :" , config.usernam);
console.log("name : " , config.name);

Search And List File And Directory In Path

fs = require('fs');

fs.readdir(process.cwd(), function (err, files) {
  if (err) {
    console.log(err);
    return;
  }
  console.log(files);
});

Search Complate With findit module

npm install findit

//This sets up the file finder
var finder = require('findit').find(__dirname);

//This listens for directories found
finder.on('directory', function (dir) {
  console.log('Directory: ' + dir + '/');
});

//This listens for files found
finder.on('file', function (file) {
  console.log('File: ' + file);
});

Simple Read File

var fs=require("fs");
console.log("Starting");
fs.readFile("./text.txt" , function(error,data){
  console.log("Content" + data);	
});
console.log("finish ....");

Simple ReadSync File

var fs=require("fs");
console.log("Starting");
var con=fs.readFileSync("./text.txt");
console.log("Content :" + con);
console.log("finish ....");

Write In File

var fs=require("fs");
console.log("Starting");
fs.writeFileSync("writesync.txt", "Hello World !!! My name Is Amir");
console.log("Finished");

Write In Json File

var fs = require('fs');

  var myOptions = {
    name: 'Avian',
    dessert: 'cake'
    flavor: 'chocolate',
    beverage: 'coffee'
  };

  var data = JSON.stringify(myOptions);

  fs.writeFile('./config.json', data, function (err) {
    if (err) {
      console.log('There has been an error saving your configuration data.');
      console.log(err.message);
      return;
    }
    console.log('Configuration saved successfully.')
  })
  
  
And Now ReadFrom File :

var fs = require('fs');

  var data = fs.readFileSync('./config.json'),
      myObj;

  try {
    myObj = JSON.parse(data);
    console.dir(myObj);
  }
  catch (err) 
    console.log('There has been an error parsing your JSON.')
    console.log(err);
  }

Write In Json File With nconf module

 npm install nconf

 var nconf = require('nconf');

  nconf.use('file', { file: './config.json' });
  nconf.load();
  nconf.set('name', 'Avian');
  nconf.set('dessert:name', 'Ice Cream');
  nconf.set('dessert:flavor', 'chocolate');

  console.log(nconf.get('dessert'));

  nconf.save(function (err) {
    if (err) {
      console.error(err.message);
      return;
    }
    console.log('Configuration saved successfully.');
  });