Nidefor Mac (node.js V0.2.0

As with any programming language, platform, or tool, the first step to using it is getting it installed. Many of them typically come with a speedy way to upgrade when a new version is available.

If you're using OS X or Windows, the best way to install Node.js is to use one of the installers from the Node.js download page. If you're using. A common scenario for using Node.js with the SDK for JavaScript is to set up and run a Node.js web application on an Amazon Elastic Compute Cloud (Amazon EC2) instance. In this tutorial, you will create a Linux instance, connect to it using SSH, and then install Node.js to run on that instance.

By default, there's not a way to upgrade the version of Node.js you've got from within Node.js itself. That said, there's a fantastic tool for the community called nvm that allows you to manage the versions of Node.js that you've got installed locally.

One awesome aspect of nvm is that it manages the versions of Node.js, it doesn't just upgrade them. This means you can have the latest version of Node.js, the latest versions of all the LTS release lines, and any number of other versions you want to use or test as well.

In this quick tutorial, we'll take a look at how to install nvm, and then how to start using it as your version manager for Node.js. Once we've completed the tutorial, you'll be ready to take the next step with Node.js.

This guide covers installing nvm on macOS and Linux - note that all versions of Node.js may not support every version of macOS or Linux.

Step 0: The Quick Guide (TL;DR) to Get Node.js Installed using nvm

Here's the abbreviated guide, highlighting the major steps:

Download the nvm install script via cURL:
- curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.0/install.sh bash
Ensure that nvm was installed correctly with nvm --version, which should return the version of nvm installed.
Install the version of Node.js you want
- Install the latest version with nvm install node
- Use the latest version with nvm use node
- Install the latest LTS version with nvm install --lts
- Use the latest LTS verison with nvm use --lts

Step 1 (Optional): Ensure your system has the appropriate C++ compiler

In some cases, like when installing Node.js releases from their source or installing versions of Node.js before0.8.6 (when the project started shipping binaries), you'll need to ensure that your system has the appropriate C++ build tools.

For LTS and modern releases, you will not need this step. That said, it's a nice to have to ensure that the majority of requirements are met in any scenario.

On macOS, you've got two options for a C++ compiler: the full XCode application or the stand-alone Command Line Tools portion of Xcode.

To get these on macOS, you can follow these steps:

Open your terminal of choice
Run xcode-select --install as a command
- A popup will appear
- Select Install
Allow the download to run to completion
If the installation went uninterrupted, you should have the necessary tools to use nvm!

On Linux, the C++ compiler will vary from distribution to distribution. For example, on Debian and Ubuntu, you'll need to install build-tools and libssl-dev, but this may be different on your given Linux distribution.

To get build-tools and libssl-dev on Debuan and Ubuntu distributions, you can run these commands:

Step 2: Download nvm with the install script

Once you've got the right C++ compiler for your system, now it's time to run the nvm install script. Here are the single-step install scripts for both macOS and Linux. You've got the option of cURL or Wget but both achieve the same result.

Note: If your Linux system doesn't have either cURL or Wget, you can run sudo apt-get install curl and use the cURL method.

Running the Install Script with cURL:

To install nvm with the cURL method, run the following command in your terminal:

Using the Install Script with Wget:

To install nvm with the Wget method, run the following command in your terminal:

Step 3: Verify that nvm was Properly installed

After running the install script from Step 2, nvm should have successfully installed. To ensure that nvm is up and running on your machine, you can test it with the following command:

This command will return something like (though not necessarily exactly) the following:

Missing the `nvm` command after running the install script?

If you're using macOS, you may be missing a .bash_profile file - to troubleshoot this, you can run touch ~/.bash_profile in your command line and re-run the installer script.

If the problem persists after that, you can open the existing .bash_profile file (using your favorite text editor) and add the following line to it:

If you're still having issues, you can take a peek at this issue to find a discussion of the problem and a collection of possible resolutions.

Step 3: Using nvm to manage Node.js

Congratulations! You've now got nvm - a tool to easily allow you to manage and swap out the versions of Node.js you've got installed locally. Now, let's get you started with doing just that.

Install the latest Node.js version

To install the latest available version of Node.js, you can use the following command:

Next, to use that version of Node.js in any new shell, you can simply run the use command:

Install the latest Node.js LTS version

To install the latest available LTS version of Node.js, you can run the following command:

And to use that latatestTS version of Node.js in any new shell, you can simply run the use command:

Step 6: Go build applications, APIs, tools, and more with Node.js!

Now you've got a fantastic version manager for Node.js. It's time to start building!

Get unparalleled visibility into application performance and system health.

We've got some resources to get you kickstarted! Both the breadth and depth of the Node.js and the JavaScript ecosystems are quite large - in addition to the developer tools like NodeSource N Solid and Certified Modules, we've got a ton of tutorials, guides, and articles to help you get kick started with Node.js.

If you're interested in keeping your code clean, maintainable, and collaborative, take a peek at our post on using ESLint for linting your JavaScript applications. Are you interested in building web applications with Node.js? One of the most challenging aspects of web apps is security - you can learn security best practices for Express to lock down your web apps, to prevent breaches and attacks. Or, maybe you want to deploy your Node.js apps with Docker? Then you should definitely read our article on dockerizing your Node.js applications.

That said, if you want to keep in touch with the Node.js ecosystem, you should follow @NodeSource on Twitter! We'll keep you updated with important news from the core Node.js project, fresh and useful Node.js tutorials, and more.

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As an asynchronous event driven JavaScript runtime, Node is designed to build scalable network applications. In the following 'hello world' example, many connections can be handled concurrently. Upon each connection the callback is fired, but if there is no work to be done, Node 64 bit will sleep.
This is in contrast to today's more common concurrency model where OS threads are employed. Thread-based networking is relatively inefficient and very difficult to use. Furthermore, users of Nodejs are free from worries of dead-locking the process, since there are no locks. Almost no function in the app directly performs I/O, so the process never blocks. Because nothing blocks, scalable systems are very reasonable to develop in Node.
Node.js is similar in design to, and influenced by, systems like Ruby's Event Machine or Python's Twisted. It takes the event model a bit further. It presents an event loop as a runtime construct instead of a library. In other systems, there is always a blocking call to start the event-loop. Typically behavior is defined through callbacks at the beginning of a script and at the end starts a server through a blocking call like EventMachine::run(). In Node js there is no such start-the-event-loop call. It simply enters the event loop after executing the input script. The tool exits the event loop when there are no more callbacks to perform. This behavior is like browser JavaScript — the event loop is hidden from the user.
HTTP is a first-class citizen in Nodejs, designed with streaming and low latency in mind. This makes Node js well suited for the foundation of a web library or framework.
Just because Nodejs is designed without threads, doesn't mean you cannot take advantage of multiple cores in your environment. Child processes can be spawned by using child_process.fork() API, and are designed to be easy to communicate with. Built upon that same interface is the cluster module, which allows you to share sockets between processes to enable load balancing over your cores.
Also Available: Download Node.js for Mac