I know that
Node.js allows to write JavaScript code that runs directly in a
computer process itself instead of in a browser
Reading this, I try to open my terminal and run:
console.log('hello')
but I get zsh: unknown file attribute.
The same happens with node console.log('hello').
If I instead create a file hello.js and put the console inside it and then I run:
node src/hello.js
it works. Why? What am I missing?
Sorry for the (maybe) stupid question
It's because the console.log('hello') is being evaluated by your shell (zsh) before running the command and it has no idea what console.log('hello') is. You could use the -e or --eval arguments.
$ node -e "console.log('hello')"
If your using linux, first type node It will profile for you a REPL. which is essecially the excution terminal.
You can also do the same on windows
I have been trying to figure out how to open a new terminal window from a Node application and run a preset command or script there.
I can open the terminal window:
const { exec } = require('child_process')
exec('open -a Terminal ' + process.env.HOME)
And this works fine, I have done a bit of research but it seems I can only find examples directed to bash
Could anyone help me on this?
Thanks
One way to do this would be to place the commands you want to run in a shell script with the .command extension. By default, these files will be opened in the Terminal application on macOS. This is a bit of a workaround, but I think it achieves what you would like to do.
Say we have the file hello.js containing the following:
console.log("Hello World")
And the shell script run_node.command
#!/bin/bash
node hello.js
Running the command open run_node.command will open a new Terminal.app instance and run the shell script, which in turn runs the node command. The terminal will close when the script exits.
I am attempting to work with node and learning how to write in Javascript. I am currently trying to use my terminal to run a basic "Hello world" js file using node. However, when I attempt to use $node index.js (that's what the file is called). All the terminal responds with is index.js command not found. I tried to do it with the just the terminal window, I have also tried to run it through the integrated terminal within data studio, so I am unsure of where I went wrong.
Here is a screen shot of my window.
Remove the $ sign. In web examples, docs use $ to show that you run it in the command line.
Instead use node index.js, or set up a package.json file and use npm start (npm start should contain node index.js).
Final Clarification (if you didn't understand the above explanation)
Run node index.js. $ is never used, except to show you that the command is used in the command line.
I am trying to run a hello world program written in javascript in a separate file named hello.js
Currently running windows version of node.js.
The code runs perfectly in console window but how do I reference the path in windows environment.
C:\abc\zyx\hello.js
in Unix I guess it is showing $ node hello.js
I'm absolutely new to Node.js Please correct me if I am doing something wrong.
I tried
> node C:\abc\zyx\hello.js ----didn't work
> C:\abc\zyx\hello.js --didn't work
UPDATE1:
Added node.exe to the folder where hello.js file is sitting.
Added path point to the folder c:\abc\zyx\ and I get an error that says
ReferenceError: hello is not defined
see contents of hello.js
setTimeout(function() {
console.log('World!');
}, 2000);
console.log('Hello');
UPDATE 2:
So far I have tried all these version and none of them seems to work. May be I am doing something completely wrong.
>node hello.js
>$ node hello.js
>node.exe hello.js
>node /hello.js
>node \hello.js
> \node \hello.js
> /node /hello.js
> C:\abc\xyz\node.exe C:\abc\xyz\hello.js
> C:\abc\xyz\node.exe C:/abc/xyz/hello.js
> hello.js
> /hello.js
> \hello.js
>node hello
Refer to my file structure
.
├── hello.js
├── node.exe
└── paths.txt
RESOLVED:
Instead of running node.exe, try running in command prompt with the following option and it worked.
c:\>node c:\abc\hello.js
Hello
World! (after 2 secs)
Here are the exact steps I just took to run the "Hello World" example found at http://nodejs.org/. This is a quick and dirty example. For a permanent installation you'd want to store the executable in a more reasonable place than the root directory and update your PATH to include its location.
Download the Windows executable here: http://nodejs.org/#download
Copy the file to C:\
Create C:\hello.js
Paste in the following content:
var http = require('http');
http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello World\n');
}).listen(1337, "127.0.0.1");
console.log('Server running at http://127.0.0.1:1337/');
Save the file
Start -> Run... -> cmd
c:
C:>node hello.js
Server running at http://127.0.0.1:1337/
That's it. This was done on Windows XP.
Install the MSI file:
Go to the installed directory C:\Program Files\nodejs from command prompt n
C:\>cd C:\Program Files\nodejs enter..
node helloworld.js
output:
Hello World
You need to make sure that node is in your PATH. To set up your path, this out.
Make sure that the directory that has node.exe is in your PATH. Then you should be able to
run node path_to_js_file.js.
For a good "Hello World" example, check out: http://howtonode.org/hello-node
another simple way
download nodejs to your system
open a notepad write js command "console.log('Hello World');"
save the file as hello.js preferably same location as nodejs
open command prompt navigate to the location where the nodejs is located
c:\program files\nodejs
and run the command from the location like c:\program files\nodejs>node hello.js
in case the js file in another location give the path of file
c:\program files\nodejs>node path\hello.js
I installed node for windows.
There is a node.js command prompt when I search for node.js in windows 7 start menu
If you run this special command prompt, you can node anything in any location without setting up the path or copy node.exe everywhere.
WinXp:
I have created a .bat file
node c:\path\to\file\my_program.js
That just run my_program.bat from Explorer or in cmd window
Go to cmd and type: node "C:\Path\To\File\Sample.js"
Windows/CMD does not know where the node file is located. You can manually type out:
path=%path%;"c:\Program Files\nodejs"
each time you open a new cmd.exe prompte
OR (in Windows 10),
right click on This PC -> properties.
Click on Advanced system settings -> Environment Variables (bottom right).
Select Path and click Edit.
Click new and enter C:\Program Files\nodejs.
Reboot and you should be able to run node from any directory.
Just change file association of .js file to node.exe and you can run directly from explorer.
Right click on the file -> Select "Open with" -> Select "Choose another program"
Check box "Always use this app to open .js file"
Click "More apps" -> "Look for another app in PC"
Navigate to node.js installation directory.(Default C:\Program Files\nodejs\node.exe"
Click "Open" and you can just see cmd flashing
Now you will be able to run any .js files directly just by double clicking.
Note: Adding below code to the end of js file will be useful as it will keep the console open for a keystroke.
console.log('Press any key to exit');
process.stdin.setRawMode(true);
process.stdin.resume();
process.stdin.on('data', process.exit.bind(process, 0));
The problem was that you opened the Node.js repl while everyone automatically assumed you were in the command prompt. For what it's worth you can run a javascript file from the repl with the .load command. For example:
.load c:/users/username/documents/script.js
The same command can also be used in the command prompt if you first start node inside the command prompt by entering node with no arguments (assuming node is in PATH).
I find it fascinating that 1)everyone assumed you were in the command prompt rather than repl, 2)no one seems to know about .load, and 3)this has 273 upvotes, proving that a lot of other node.js beginners are similarly confused.
Step For Windows
press the ctrl + r.then type cmd and hit enter.
now command prompt will be open.
after the type cd filepath of file. ex(cd C:\Users\user\Desktop\ )
then hit the enter.
please check if npm installed or not using this command node -v.
then if you installed will get node version.
type the command on command prompt like this node filename.js . example(node app.js)
C:\Users\user\Desktop>node app.js
type node js command prompt in start screen. and use it.
OR
set PATH of node in environment variable.
Install node properly, that's it.
Now open terminal to path where your .js file is.
for example- if Javascript file(fileName.js) is at folder C:\Documents\Project1.
Just go to that folder, type node to check node is enable
then type node fileName.js
Simple! Your work is done!!
c:\> node.exe %CD%\hello.js
%CD% captures the current directory under DOS
For all stuck on how to start!
https://github.com/sethvincent/javascripting
Copy here incase link dies:
Open node.js command prompt
Make directory called javascripting by typing "mkdir javascripting"
Change directory into the javascripting folder by typing "cd javascripting"
Create a file named introduction.js by typing "touch introduction.js" OR FOR WINDOWS: "NUL > introduction.js"
Open the file and type some javascript e.g. "Console.log('hello');"
Save the file and check it runs by typing "javascripting verify introduction.js"
All you have to do is right click the .js file on Windows and press "Open with Command Prompt"
OR
Open cmd, copy the path to the folder containing your script, and run the command "cd [paste text here]". Then do "node example.js"
I had such problem for windows. And I decided it so:
startApp.cmd:
#set JAVA_HOME=C:\jdk160_24
#set PATH=%JAVA_HOME%/bin;%PATH%
#cd /D C:\app\
#start /b C:\WINDOWS\system32\cscript.exe
C:\app\start.js
and saved it cmd file in dir C:\scripts
next file is runApp.bat:
C:\scripts\startApp.cmd
I am newbie in Node.js and started making hello world exercise. I have run into a problem, it is that I make a file with code 'console.log ("Hello World");' and saves it as a test. Then I open it in cmd and write node and then the node test, but for this answer ..... do not know why it does it, although I expect Hello World? I've tried and looking at the internet but can not find an answer to it.
I have install git and node.js.
hope someone can help me?
For example, if you save your file in `/home/toto/example.js with :
console.log('Hello World');
You just launch that by :
nodejs /home/toto/example.js
# or
cd /home/toto/
nodejs example.js
If the command nodejs is not found, test with the command node. It depend of your installation package.
node /home/toto/example.js
# or
cd /home/toto/
node example.js
1.Save the helloword.js file into a directory of your choice for example the folder "home"
2.Go to the directory in command prompt where the "helloword.js" file is by with cd:
cd home
3.You can test if the file is there by typing:
ls (mac)
dir (windows)
4.If the file is there simply write
node helloworld.js
and you should be good!:)