Downgrade npm to an older version

To downgrade npm to an older version, you can use npm's own commands to perform this operation. Here is a step-by-step guide:

1. Check Current Version: First, check the currently installed npm version by running the following command in the command line:

   shell
   

pm -v```

1. Select Target Version: Next, decide which version to downgrade to. Review historical version information by visiting the npm official website or GitHub repository.

2. Install Specific Version Using npm: Once you've selected the version, use the following command:

   shell
   

pm install -g npm@version_number``` For example, to downgrade to version 6.14.8, input:

shell
pm install -g npm@6.14.8```

4. **Verify Version:**
After installation, confirm the current npm version by running `npm -v` again to ensure it matches your target version.

### Practical Example

Suppose I recently upgraded npm to the latest version, but it's incompatible with my project. My project runs well with npm 6.14.8, so I need to downgrade to this version. Following the steps above, I can easily complete this operation.

### Important Notes

- Before downgrading, back up important data to prevent loss due to version incompatibility.
- Operating system permissions may block npm installation. If you encounter permission issues, add `sudo` before the command, for example: `sudo npm install -g npm@6.14.8`.