Update npm on windows

updateNpm.bat

rem see https://github.com/coreybutler/nvm-windows/issues/300

@echo off
SETLOCAL EnableDelayedExpansion

if [%1] == [] (
	echo Pass in the version you would like to install, or "latest" to install the latest npm version.
) else (
	set wanted_version=%1

	if "!wanted_version!" == "latest" (
		for /f %%i in ('npm show npm version') do set wanted_version=%%i
	)

	for /f %%i in ('npm -g -v') do set cur_version=%%i

	if "!cur_version!" == "!wanted_version!" (
		echo Already on npm version !wanted_version!.
	) else (
		echo Updating to !wanted_version!...

		rename "!NVM_SYMLINK!\npm" npm2
		rename "!NVM_SYMLINK!\npm.cmd" npm2.cmd
		rename "!NVM_SYMLINK!\node_modules\npm" npm2
		node "!NVM_SYMLINK!\node_modules\npm2\bin\npm-cli.js" i npm@!wanted_version! -g --force

		for /f %%i in ('npm -g -v') do set new_version=%%i

		echo New version installed is !new_version!

		if "!new_version!" == "!wanted_version!" (
			echo Successfully updated to !wanted_version!. Cleaning up backups...
			del "!NVM_SYMLINK!\npm2"
			del "!NVM_SYMLINK!\npm2.cmd"
			@RD /S /Q "!NVM_SYMLINK!\node_modules\npm2"
			echo Update complete.
		) else (
			echo Something went wrong. Rolling back.
			if exist "!NVM_SYMLINK!\npm" (
				del "!NVM_SYMLINK!\npm"
			)
			if exist "!NVM_SYMLINK!\npm.cmd" (
				del "!NVM_SYMLINK!\npm.cmd"
			)
			if exist "!NVM_SYMLINK!\node_modules\npm" (
				@RD /S /Q "!NVM_SYMLINK!\node_modules\npm"
			)
			rename "!NVM_SYMLINK!\npm2" npm
			rename "!NVM_SYMLINK!\npm2.cmd" npm.cmd
			rename "!NVM_SYMLINK!\node_modules\npm2" npm
		)
	)
)

This just saved me a ton of work. Thanks!

NodeJS doesn't have to be in !PROGRAMFILES!
In fact, you can put it anywhere where you have write-access when you don't have admin rights, you just need to add it to the path environment variable.
So here's how to properly find the node path:

• split path by ";"
• foreach folder in %path% => if folder contains "node" (case_insensitive) => node_path is this folder
• it node path not in %path%, assume !PROGRAMFILES!\nodejs

Proper way would be to search the registry as well, assuming there is any entry there (HKLM or HKCU if installed without admin rights)

@echo off


set node_path=!PROGRAMFILES!\nodejs

for %%A in ("%path:;=";"%") do (
    REM echo "%%~A"
    
    echo %%~A|find /i "node" >nul
    if not errorlevel 1 (
        set node_path=%%~A
    ) 


)


echo "Node-Path: %node_path%"

Full script:
https://gist.github.com/ststeiger/8d3588a8864dd0a2f82ad55adc48a39c

Works great, thank you!

i am getting this error, whether i run this script as admin or not:

Updating to 6.14.2...
npm ERR! code EEXIST
npm ERR! path C:\Program Files\nodejs\node_modules\npm\bin\npm-cli.js
npm ERR! dest C:\Program Files\nodejs\npm.ps1
npm ERR! EEXIST: file already exists, cmd shim 'C:\Program Files\nodejs\node_modules\npm\bin\npm-cli.js' -> 'C:\Program Files\nodejs\npm.ps1'
npm ERR! File exists: C:\Program Files\nodejs\npm.ps1
npm ERR! Remove the existing file and try again, or run npm
npm ERR! with --force to overwrite files recklessly.

npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\mpoto\AppData\Roaming\npm-cache_logs\2020-03-16T11_48_11_629Z-debug.log
'npm' is not recognized as an internal or external command,
operable program or batch file.
New version installed is
Something went wrong. Rolling back.

can someone tell me what is wrong? i checked the log file, but there is the same error inside

NodeJS doesn't have to be in !PROGRAMFILES!
In fact, you can put it anywhere where you have write-access when you don't have admin rights, you just need to add it to the path environment variable.
So here's how to properly find the node path:

* split path by ";"

* foreach folder in %path% =>  if folder contains "node" (case_insensitive) => node_path is this folder

* it node path not in %path%, assume !PROGRAMFILES!\nodejs

Proper way would be to search the registry as well, assuming there is any entry there (HKLM or HKCU if installed without admin rights)

@echo off


set node_path=!PROGRAMFILES!\nodejs

for %%A in ("%path:;=";"%") do (
    REM echo "%%~A"
    
    echo %%~A|find /i "node" >nul
    if not errorlevel 1 (
        set node_path=%%~A
    ) 


)


echo "Node-Path: %node_path%"

Full script:
https://gist.github.com/ststeiger/8d3588a8864dd0a2f82ad55adc48a39c

This was spot on! I use Laragon on WIndows and this worked a treat. thank you

node "!NVM_SYMLINK!\node_modules\npm2\bin\npm-cli.js" i npm@!wanted_version! -g --force

This line failed for me:

Error: Cannot find module 'C:\node_modules\npm2\bin\npm-cli.js'

But npm install -g npm@latest worked afterwards