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I am very curious about it , but don't know how can it know where to insert or delete package name ?

Dearest
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    You can always read the source code on https://github.com/npm/cli and clarify what you want to know. – dereli Aug 16 '18 at 14:00

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Try this to auto insert latest version in package.json

npm install --save xx

obba
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  • Since `npm@5.0.0` running `npm install ` (without the `--save` flag) by default adds the package to the `dependencies` section of _package.json_ - unless `npm config set save false` has been set of course. The [docs](https://docs.npmjs.com/cli/install) no longer include the `--save` flag as it's redundant. However, the `--save` flag is available when running [`npm uninstall `](https://docs.npmjs.com/cli/uninstall) if you want to remove from _package.json_. – RobC Aug 16 '18 at 14:17