How to solve 'vue-cli-service' is not recognized as an internal or external command?

I think you are using cmd in windows.

Try deleting the node_modules folder and after that run npm i from the cmd.

Then try running npm run serve again and see if it works this time

npm install @vue/cli-service -g

This will install global npm package.

@vue/cli-service is usully installed as global, because you do not usually copy these types of packages to every project.

If the global npm package gets corrupted, it is not stored in node_modules folder, but rather in other depending on the os. Therefore removing node_modules does not help. Locations for global node_modules folders are %USERPROFILE%\AppData\Roaming\npm\node_modules (Win10) or /usr/local/lib/node_modules (Linux) Check this stack overflow post on how to locate global packages.

it will depend on package manager you are using

1. if you are using yarn run yarn or yarn install and then yarn serve
2. if you are using npm run npm install and then npm run serve