How to check whether nodejs is enabled on the server

With the gradual popularity of Node.js in web development, more and more developers are beginning to use Node.js to build JavaScript-based applications. For a developer who wants to use Node.js to build an application, the first thing he needs to ensure is whether the Node.js environment has been turned on on the server.

So how to check whether Node.js is enabled on the server? Next, this article will take you through the process step by step.

1. Check whether Node.js has been installed

First, you need to check whether Node.js has been installed on the server. If you have installed Node.js, you can quickly enter the Node.js REPL (Read Eval Print Loop, interactive interpreter) and enter the following command from the console:

node -v

As shown below:

If the console returns the version number of Node.js, it means that you have successfully started the Node.js environment. Otherwise you need to install Node.js.

2. Install Node.js

If Node.js is not installed on your server, you need to install it first. Node.js supports multiple operating systems. You can go to the Node.js official website to download the installation package.

On Linux systems, you can use the following command to install Node.js:

sudo apt-get install nodejs

Then enter the following command to confirm whether the installation is successful:

node -v 

3. Confirm Node.js Whether it is installed correctly

After completing the installation of Node.js, we need to confirm whether Node.js has been installed correctly.

Open the console and enter the following command:

node -v

If the Node.js version is successfully displayed, you have successfully installed Node.js. If it says 'node' is not recognized as an internal or external command, operable program or batch file., it means Node.js is not installed correctly.

4. Create a test file

We can first create a simple test file to verify whether Node.js can run normally.

Create the test.js file and enter the following code:

console.log('Hello World');

After saving the file, use the following command to run the file:

node test.js

If 'Hello World' is successfully output , indicating that Node.js can run normally.

5. Check whether the server port is open

Finally, confirm whether your server port is open. If you are using the default port 80, you don't need to do anything. If you are using another port, such as 3000, you need to open that port so that the Node.js application can be accessed.

You can use the following command to monitor the port status:

netstat -an | grep 3000

If some string similar to 'LISTEN' is returned, it means that your port has been successfully opened and can be accessed.

At this point, we have successfully confirmed whether Node.js has been correctly opened on the server. Hope this article can be helpful to you.

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