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Showing the following error on using the command nodemon ./index.js after installing the nodemon module for node.js

When I tried to install nodemon with npm this error occurred
nodemon : File C:\Users\DELL\AppData\Roaming\npm\nodemon.ps1 cannot be loaded because running scripts is disabled on this system. For more information, see
about_Execution_Policies at https:/go.microsoft.com/fwlink/?LinkID=135170.
At line:1 char:1
+ nodemon ./index.js
+ ~~~~~~~
+ CategoryInfo : SecurityError: (:) [], PSSecurityException
+ FullyQualifiedErrorId : UnauthorizedAccess

command npm install -g typescript is not run on visual studio code but run on command prompt

When I run this above command on the terminal then it gives this:
tsc : File D:\Web 3 and metaverse\typescript project\node_modules\.bin\tsc.ps1 cannot be loaded because running scripts is disabled on this system. For more information, see
about_Execution_Policies at https:/go.microsoft.com/fwlink/?LinkID=135170.
At line:1 char:1
+ tsc index.ts
+ ~~~
+ CategoryInfo : SecurityError: (:) [], PSSecurityException
+ FullyQualifiedErrorId : UnauthorizedAccess
How can I resolve this error?

npx-create-react-app my-app command ERROR in Vs Code

npx : The term 'npx' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included,
verify that the path is correct and try again.
At line:1 char:1
+ npx create-react-app my-app
+ ~~~
+ CategoryInfo : ObjectNotFound: (npx:String) [], CommandNotFoundException
+ FullyQualifiedErrorId : CommandNotFoundException

You should install npx globally, try this:
npm i -g npx
On mac/linux use sudo:
sudo npm i -g npx

have you install the Node.Js?
https://nodejs.org/en/download/
if so, it's probably a "PATH environment variable" issue
Fixing npm path in Windows 8 and 10

Command eslint --init not found, why?

entered that command into mac terminal set to directory containing javascript file and package.json file, and after installing node.js, and running
npm install -g eslint
but i still get
-bash: eslint: command not found
so why?

Actually I needed to enter:
sudo npm install -g eslint
due to permissions issue

Gulp run fails on windows | Error Message : Microsoft JScript compilation error, Invalid character

I installed Node.js on my windows 7 local machine as this link says :
install-node-js-npm-windows
After that i installed Gulp.js by this command through command line :
npm install -g gulp
And then i add this path to environment variables area :
C:\Users\Majid\AppData\Roaming\npm\node_modules\gulp\bin
Now when i try to run gulp by this command :
gulp
I got this error :
Windows Script Host
Line: 1
Char: 1
Error: Invalid character
Code: 800A03F6
Source: Microsoft JScript compilation error
How can i solve this error & how can i make gulp.js workable on windows OS?
EDIT AFTER THE ANSWER :
Error is still there.
I went to this path :
C:\Users\User_Name\AppData\Roaming\npm\node_modules\gulp\bin
In command line and tried this command :
node gulp.js install
But it tells :
No gulpfile found
You should know gulp was installed in previous steps successfully.(With some warnings)
The structure of gulp.js is for linux based operating systems.
I am looking for a way to make this file workable on windows os.
USAGE :
I want to run this javascript based web site on my local machine...

You need to run "node node_modules\gulp\bin\gulp.js install", just add "node" command in front of it and also refer to the link below for more
Error running gulp on Windows 10
I can't comment but did you run "npm install" after forking the repository, to install package.json "dependencies, dev-dependencies"?
Gulp need to be installed Globally and also in your current working directory.
Run the code below to installed Gulp globally, and the other to install the repository dependencies.
npm install -g gulp
npm install
This answer is correct, But what was the problem in my side?
I shouldn't add this path :
C:\Users\Majid\AppData\Roaming\npm\node_modules\gulp\bin
To environment variable area.
I went to the root folder in cmd & reinstalled gulp globally and re ran npm install & finally gulp watch worked very well.