Node JS Tutorial

This example will show you how to convert JSON format string to JavaScript object and how to convert JS object back to a JSON format string. It also shows you how to write JSON string to a .json file and how to parse a JSON file content to a JavaScript object array.

This example will tell you how to create a custom Node JS module, how to publish it to the NPM central repository, and how to import it as a library into your node application to use.

Node js fs.watch method is used to monitor a file change event such as write data to file, delete data from a file. This example will show you how to use it to implement a data server that can monitor server-side file data change and send changed data back to the client browser.

This example will show you how to use Node.JS to create a client and server which will use UDP protocol to communicate. First, you need to import the node js dgram module. This module will control all UDP-related issues such as create a UDP client, create a UDP server, and then you can use the client

Node js use event loop to process client request, sometimes you need to make your javascript object can emit event also. This example will show you how to enable your javascript function object with emit event functions.

Node JS Stream is an interface. It has been implemented in a lot of node modules such as the fs module, http module, etc. This example will show you how to use node stream to read data from a file, write data to file, and use pipe stream to transfer data from one stream to

JavaScript objects can only store character sequence values and can not store binary data. But you may need to read and store binary data when making I/O operations such as read/write image file, read/write binary stream through a network, etc. To resolve this issue, Node JS provides the Buffer module to store and manipulate binary

Node JS EventEmitter is the object which can emit event to the event loop. It is the class in node js events module. It can be used in many cases such as when http web server receive a client request will use EventEmitter to create a on receive event, when fs module open a file

Node JS executes in a single process and single thread only, but the execution performance is very high because of event-driven design and callback function usage. This article will introduce the Node JS event loop mechanism and tell you how to create custom events in Node JS by example.

Node JS is an asynchronous JavaScript framework, all the actions in Node app can not block the code execution flow. This can make the system more efficient and faster. So node JS use callback functions heavily to make the design available. This article will tell you what callback is and how it works in Node