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Falah Al Fitri
Falah Al Fitri

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NodeJS http homepage 40: using File System module for read a file with readFile()

#node #http #module #filesystem
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NodeJS http homepage 30: create custom module and export

Falah Al Fitri ・ Dec 20 '19 ・ 1 min read

#node #http #module #export

File System1 module is one of powerfull built-in module in NodeJS.

Syntax: fs.readFile( path[, options], callback )

Example:

fs.readFile( '/etc/passwd', function ( err, data ) { if (err) throw err; console.log(data); } );
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In this post, we will set content of html static into each html files and using readFile() method for read all of them.

Ok, let's begin:

create a file "home": public/home.html and write code such as:

<h1>Hello World in NodeJS HTTP</h1> <p>NodeJS easy-to-learn</p>
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create a file "about": public/about.html and write code such as:

<h1>About me</h1> <p>I am developer</p> <p>I love programming</p>
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create a file "404": public/404.html and write code such as:

<h1>404</h1> <p>Page not found</p>
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After that, back to index.js and add File System module:

const fs = require('fs');
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Inside if ( req.url == '/' ), replace

res.write( '<h1>Hello World in NodeJS HTTP</h1>' ); res.write( '<p>NodeJS easy-to-learn</p>' );
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with

fs.readFile( './public/home.html', 'utf8', function ( err, data ) { res.write( data ); res.end(); } );
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Inside else if ( req.url == '/about'), replace

res.write( "<h1>About me</h1>" ); res.write( "<p>I am developer</p>" ); res.write( "<p>I love programming</p>" );
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with

fs.readFile( './public/about.html', 'utf8', function ( err, data ) { res.write( data ); res.end(); } );
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Inside else, replace

res.write( "<h1>404</h1>" ); res.write( '<p>Page not found</p>' );
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with

fs.readFile( './public/404.html', 'utf8', function ( err, data ) { res.writeHead( 404, { 'Content-Type': 'text/html' } ); res.write( data ); res.end(); } );
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Done.

Thank for reading :)

  1. nodejs.org File System::readFile() on date 20 december 2019 and accessed from: https://nodejs.org/docs/latest-v10.x/api/fs.html#fs_fs_readfile_path_options_callback ↩

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