Install Node.js : We shall learn to setup environment for Node.js and the prerequisites to start developing Node.js applications.
The source files of Node.js applications have extension of “.js”. Any text editor is sufficient to write Node.js code and save it as .js file. To interpret the instructions written in the source .js files, Node.js interpreter is required. The Node.js is available as a binary distributable.
Install Node.js binary distribution
Download the latest binary distribution from https://nodejs.org/download/release/latest/. Based on the Operating System and Architecture, download a suitable package. The size would be less than 20MB.
Following are the latest packages available at the time of writing this tutorials (for x64) :
For linux kernel based OS like Ubuntu/MacOS/SunOS
Once the download is complete, we have to extract the package and include it in the path variable.
Go to the downloaded folder, Open a Terminal from there and execute the following commands.
Unzip the compressed package
$ tar xvfz node-v8.4.0-linux-x64.tar.gz
$ sudo mkdir -p /usr/local/nodejs
$ sudo mv node-v8.4.0-linux-x64/* /usr/local/nodejs/
Open .bashrc file and append the following line at the end.
$ export PATH=$PATH:/usr/local/nodejs/bin
$ sudo nano ~/.bashrc
Once after adding the line, close the terminal and reopen again.To edit .bashrc, open a terminal and run the following command :
To verify if nodejs path has been added to PATH environment variable, run the following command :
$ echo $PATH
For Windows OSThe value echoed back should have “/usr/local/nodejs/bin”
For installing Node.js on Windows Operating System, double click on the .msi file and follow the prompt step by step. Finishing the prompt should install Node.js with PATH added to the environment variables.
Verify Node.js installation
Using a Text Editor, create a sample file with name verifyNode.js and copy paste the following content to that file.
console.log("Hi there! This is Node.js!")
And run the following command in Command prompt or Terminal from the directory of verifyNode.js
$ node verifyNode.js
Hi there! This is Node.js!
Run Node.js File
Following is the syntax to run a Node.js file
|$ node <file_name>|
With this Node.js Tutorial, we have learnt to install Node.js on a computer and verify the installation by executing a sample .js file.