NodeJS File System Module

NodeJS / NodeJS File System Module

File system module in Node.js used to work (Read, Create, Update, Delete, Rename files) with the files in the server system.

Program Name

Write a Program for NodeJS File System Module for Reading files using Filesystem object.

Theory
Program for NodeJS File System Module for Reading files using Filesystem object

Program Code

File Name: Example.html

File reading Example using nodejs



File Name: Nodejsexample.js

var httpobj = require('http');
var fsobj = require('fs');
httpobj.createServer(function (req, res) {
  fsobj.readFile('example.html', function(err, data) {
    res.writeHead(400, {'Content-Type': 'text/html'});
    res.write(data);
    return res.end();
  });
}).listen(8080);

Compiling and running
node Nodejsexample.js

Output
File reading Example using nodejs

Append text to files using Filesystem object

Program Name

Write a Program for NodeJS File System Append text to files using Filesystem object.

Theory
Program for NodeJS File System Module for Append text to files using Filesystem object

Program Code

File Name: Example.html

File reading Example using nodejs


File Name: Nodejsexample.js

var fsobj = require('fs');
fsobj.appendFile('Example.html', 'Append text to files!', function (err) {
  if (err) throw err;
  console.log('File Saved!');
});

Compiling and running
node Nodejsexample.js

Output
Example.html: File reading Example using nodejsAppend text to files!

Explanation
Adds text to end of the file.

Write text to files using Filesystem object

Program Name

Write a Program for Write text to files using Filesystem object in NodeJS.

Theory
Program for Write text to files using Filesystem object in NodeJS

Program Code

File Name: Example.html

File reading Example using nodejs


File Name: Nodejsexample.js

var fsobj = require('fs');
fsobj.writeFile('example.html', 'write content to file!', function (err) {
  if (err) throw err;
  console.log('File Saved!');
});

Compiling and running
node Nodejsexample.js

Output
Example.html: write content to file!

Explanation
Write: creates a file if not there and writes new content to file after removing the old content.

Replace text in the files using Filesystem object

Program Name

Write a Program for Replace text in the files using Filesystem object in NodeJS.

Theory
Program for Replace text in the files using Filesystem object in NodeJS.

Program Code

File Name: Example.html

write content to file!


File Name: Nodejsexample.js

var fsobj = require('fs');
fsobj.writeFile('example.html', 'written content to file!', function (err) {
  if (err) throw err;
  console.log('written content to file!');
});

Compiling and running
node Nodejsexample.js

Output
Example.html: written content to file!

Delete Files using Filesystem object in NodeJs

Program Name

Write a Program for Delete Files using Filesystem object in NodeJs.

Theory
Program for Delete Files using Filesystem object in NodeJs.

Program Code

File Name: Example.html

write content to file!


File Name: Nodejsexample.js

var fsobj = require('fs');
fsobj.writeFile('example.html', 'written content to file!', function (err) {
  if (err) throw err;
  console.log('written content to file!');
});

Compiling and running
node Nodejsexample.js

Output
File deleted using File system object in nodejs Example.html: File deleted

Program Name

Write a Program for Rename Files using Filesystem object in NodeJs.

Theory
Program for Rename Files using Filesystem object in NodeJs

Program Code

File Name: Example.html

write content to file!


File Name: Nodejsexample.js

var fsobj = require('fs');
fsobj.rename('example.html', 'example2.html', function (err) {
if (err) throw err;
console.log('File Renamed using File system object in nodejs');
});

Compiling and running
node Nodejsexample.js

Output
'File Renamed using File system object in nodejs i.e 'example.html' to 'example2.html'

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