Detect nodejs installation is successful

Node.js is a very popular server-side JavaScript running environment. It allows us to use JavaScript to write server-side applications, such as web applications, command line tools, etc.

Installing Node.js is the first step to start using it. But, how do we detect it after the installation is successful?

The following are some simple steps to help you detect whether Node.js is successfully installed.

1. Check the version number of Node.js

Open the terminal (Mac or Linux system) or command prompt (Windows system) and type the following command:

node -v

If the installation is successful, your Node.js version number will be displayed.

2. Execute a piece of JavaScript code

You can also try executing the following code in the terminal or command prompt:

node -e "console.log('Hello World!')"

If you see " Hello World!" message, then you can be sure that your Node.js has been successfully installed.

3. Run a simple server

You can try to run a simple server to check whether Node.js can work properly. Enter the following command in the console:

node -e "require('http').createServer((req, res) => {res.write('Hello World!'); res.end();}).listen(8080);"

Then open your web browser and go to http://localhost:8080/. If you see the message "Hello World!" , then you have successfully started a simple server.

If you receive the error "Port 8080 is already occupied" when executing this command, you can try changing the port, such as this:

node -e "require('http').createServer((req, res) => {res.write('Hello World!'); res.end();}).listen(8888);"

Then reload in the browserhttp://localhost:8888/.

Finally, if you receive error messages or prompts when executing any of the above commands, please double-check whether your Node.js installation is successful. If your Node.js is not installed properly, you will not be able to execute JavaScript code or start the server normally.

To sum up, these methods can help you detect whether the installation of Node.js is successful to ensure that you can use it smoothly for development.

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