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Node.js Tutorials - Part 0

Node.js Tutorial 5

Reading and writing files is something you can't do in standard JavaScript. In node.js file handling comes with the built in file system module called “fs”. The module is loaded using:

var fs = require('fs');

Writing Files

Writing a whole file can be done with the “writeFile” function. This requires a buffer containing the whole contents of the file. There are two versions of this function: The first version “writeFile” is asynchronous and the second version “writeFileSync” is synchronous.

var data = "Hello World, this is a text...";
var filename = "file.txt";

fs.writeFile(filename, data , function (err) {
  if (err) throw err;
  console.log('Ok. File written...');

Reading Files

Reading a whole file can be done with the “readFile” function. There is also a synchronous and an asynchronous version of this function.

var filename = "file.txt";

fs.readFile(filename, function (err, data) {
  if (err) throw err;
  console.log("" + data);

node/tutorial05.txt · Last modified: 2013/09/16 22:05 by mchristen