chandnasujatha_shoppingexample/FileOperations.js

Demo for NodeJS

var fs = require('fs');
var http = require('http');
var data = require('./data.json');
var os=require('os');

// var http = require('http');
 
// //console.log(data);

// var server = http.createServer(function(req,res){
//     res.setHeader("Access-Control-Allow-Origin","*")
//     res.write(JSON.stringify(data));
//     res.end();
// }
// );

// server.listen(5432);


var filename = 'app.js';
// //Read files synchronously
// var contents = fs.readFileSync(filename,'utf8');
// console.log(contents);

// //Read files asynchronously
// fs.readFile(filename,function(err,data){
//     if(err)
//     {
//         throw err;
//     }
//     console.log(data.toString());
// })
// console.log("File is being read async");

// //Write to file
// var newFile = 'TestFile.txt';
// fs.appendFile(newFile,"Some Text to write",function(err){
//     if(err)
//     throw err;
//     console.log("File is appended");
// })

// // Replace the text of file, if its there else will create a new one and append
// var newFile = 'TestFile.txt';
// fs.writeFile(newFile,"Some Text to replace",function(err){
//     if(err)
//     throw err;
//     console.log("File is updated");
// })

// // To find details of file inside a directory
// var dir = "../NodeJS";
// fs.readdir(dir, function(err,files){
//     for(let index=0;index<files.length;index++){
//         const element=files[index];
//         fs.stat(element,function(err,stats){
//             console.log(index+1, element);
//             console.log(stats);
//             console.log("-----------------------------------------------------")
//         })
//     }
// })

// IO Operations
console.log(os.type());
//console.log(os.upstime()/3600/24 + 'days'); //Time since last shut down
console.log(os.hostname());