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Node.js Examples. Node.js Examples: We shall go through examples of basics, fs module, mysql module, http module, url module, parsing json, etc. Following is the list of Node.js Examples we shall go through in this Node.js Tutorial. How to build a multiplayer poker game in nodejs? I am building a multiplayer poker game, and I need an architecture to manage the game state in the server. Is there any good libraries for this problem? Now they use Node JS for cross-platform pages and web frameworks like Express. #10 Trello and Node.js sample app. One of the best project management tools, Trello started out in 2011 fully on JavaScript. Trello developers built the server part with Node.js. Reason for such choice was the demand for numerous open connections support.
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I have a Node.js/Express.js app running on my server that only works on port 3000 and I'm trying to figure out why. Here's what I've found: Without specifying a port (app.listen), the app runs b. I am making an online poker server in NodeJS. Currently, the state of the game is being sent to each client. So using debugging tools a client can see all the other player's card IDs. I would like to send the game state but modify it so that player card ID's are represented in ciphertext.
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Major Node.js versions enter Current release status for six months, which gives library authors time to add support for them.After six months, odd-numbered releases (9, 11, etc.) become unsupported, and even-numbered releases (10, 12, etc.) move to Active LTS status and are ready for general use.LTS release status is 'long-term support', which typically guarantees that critical bugs will be fixed for a total of 30 months.Production applications should only use Active LTS or Maintenance LTS releases.
| Release | Status | Codename | Initial Release | Active LTS Start | Maintenance LTS Start | End-of-life |
|---|---|---|---|---|---|---|
| v10 | Maintenance LTS | Dubnium | 2018-04-24 | 2018-10-30 | 2020-05-19 | 2021-04-30 |
| v12 | Maintenance LTS | Erbium | 2019-04-23 | 2019-10-21 | 2020-11-30 | 2022-04-30 |
| v14 | Active LTS | Fermium | 2020-04-21 | 2020-10-27 | 2021-10-19 | 2023-04-30 |
| v15 | Current | 2020-10-20 | 2021-04-01 | 2021-06-01 | ||
| v16 | Pending | 2021-04-20 | 2021-10-26 | 2022-10-18 | 2024-04-30 |
Dates are subject to change.
In this section, we will learn how to create a simple Node.js web server and handle HTTP requests.
To access web pages of any web application, you need a web server. The web server will handle all the http requests for the web application e.g IIS is a web server for ASP.NET web applications and Apache is a web server for PHP or Java web applications.
Node.js provides capabilities to create your own web server which will handle HTTP requests asynchronously. You can use IIS or Apache to run Node.js web application but it is recommended to use Node.js web server.
Create Node.js Web Server
Node.js makes it easy to create a simple web server that processes incoming requests asynchronously.
The following example is a simple Node.js web server contained in server.js file.
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In the above example, we import the http module using require() function. The http module is a core module of Node.js, so no need to install it using NPM. The next step is to call createServer() method of http and specify callback function with request and response parameter. Finally, call listen() method of server object which was returned from createServer() method with port number, to start listening to incoming requests on port 5000. You can specify any unused port here.
Run the above web server by writing node server.js command in command prompt or terminal window and it will display message as shown below.
Node.js web server at port 5000 is running..
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This is how you create a Node.js web server using simple steps. Now, let's see how to handle HTTP request and send response in Node.js web server.
Handle HTTP Request
The http.createServer() method includes request and response parameters which is supplied by Node.js. The request object can be used to get information about the current HTTP request e.g., url, request header, and data. The response object can be used to send a response for a current HTTP request.
The following example demonstrates handling HTTP request and response in Node.js.
In the above example, req.url is used to check the url of the current request and based on that it sends the response. To send a response, first it sets the response header using writeHead() method and then writes a string as a response body using write() method. Finally, Node.js web server sends the response using end() method.
Now, run the above web server as shown below.
C:> node server.jsNode.js web server at port 5000 is running..
To test it, you can use the command-line program curl, which most Mac and Linux machines have pre-installed.
curl -i http://localhost:5000You should see the following response.
HTTP/1.1 200 OKContent-Type: text/plain
Date: Tue, 8 Sep 2015 03:05:08 GMT
Connection: keep-alive
This is home page.
For Windows users, point your browser to http://localhost:5000 and see the following result.
The same way, point your browser to http://localhost:5000/student and see the following result.
It will display 'Invalid Request' for all requests other than the above URLs.
Sending JSON Response
The following example demonstrates how to serve JSON response from the Node.js web server.
So, this way you can create a simple web server that serves different responses.
Learn how to create Node.js Web Application in Visual Studio.