My solution to solve this problem:

1. Go to C:\Program Files\nodejs

2. Edit 4 files named npm, npm.cmd, npx, npx.cmd

3. Open files in VS Code

4. Replace prefix -g with prefix --location=global in all four files

5. Save all (if asked save as admin)

Good to go!

I see from your screenshot you are using npm ver 8.11.0. I believe the error you are seeing was an issue on that version, and it was fixed on npm ver 8.12.1

Can you try updating your npm to the most recent version? That should solve the warning.

Backend Rule Now Gonna Solve npm WARN config global --global, --local are deprecated. Use --location=global instead

I think your Node.js command prompt is throwing this error to you don't worry I'll fix this error ► Node.js CMD Prompt Error

First of all open you c drive and explore your program file after that open node js folder.

Please look at this picture. This picture tells you a lot► Node.js Folder

Now you have to do open vs code or any code editor as a administrator ► In this image i explain which two file you need to edit

Okay now change npm file line number 23 prefix-g to prefix --location=global

View this image it's help you to understand ► How can you change npm prefix

Now you have to change another one npm.cmd file prefix

open npm.cmd file on your code editor and change line no 12 prefix-g to prefix --location=global

This image explain how can do this ► Change npm.cmd

If you have same problem in your npx then follow my instruction

1st open your npx file on your code editor ► Select This Two File

2nd Now start edit with only npx file like that ► npx file prefix set

3rd Now start edit npx.cmd file like that ► npx cmd prefix set

Solution

1. Go to the node.js installation folder, eg. C:\Program Files\nodejs
2. open npm.cmd with notepad as admin
3. Replace prefix -g with prefix --location=global, and Save
4. Do the same for npx.cmd

Check if it is fixed

If it is not working, update npm using npm install npm@latest -g

how I can fix this error please for Mac : npm WARN config global --global, --local are deprecated. Use --location=global instead.