Solve the problem of zsh: command not found: npm reported by mac system

1. Error zsh: command not found: npm

According to the prompt: zsh: command not found: npm. It means that the npm command was not found, which means there are two situations:
one is: you do not have the environment to install nodejs at all; the other is that the environment variables are not configured, or the configuration is incorrect.

2. Solution

In this case, you need to check the nodejs environment first. Execute the following command:

brew info node@10

Check the version of nodejs in your homebrew. If Not installed appears, it means it is not installed.

You can execute the following commands:

brew install node@10

After waiting for the installation to complete, execute npm -v to see if there are still errors.

moon@moondeiMac % npm -v 
zsh: command not found: npm

Execute the following code to add environment variables to the system:

echo 'export PATH="/usr/local/opt/node@10/bin:$PATH"' >> ~/.zshrc

and then execute

source $HOME/.bashrc
source ~/.zshrc
source $HOME/.zshrc

If you execute npm -v again, the error will no longer be reported.