NPM details

NPM – or “Node Package Manager” – is the default package manager for JavaScript’s runtime Node.js.

PM consists of two main parts:

• a CLI (command-line interface) tool for publishing and downloading packages, and
• an online repository that hosts JavaScript packages

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.npmrc file in angular details

The npmrc manages the npm config files.

What is registry in Npmrc file?

By default NPM—the Node Package Manager—uses its own public registry (at https://registry.npmjs.org) to pull down packages when you run npm install or npm update inside of a project.

If you want to specify different registries at multiple levels or scopes to override these default value

i.e. https://registry.npmjs.org

you can use .npmrc file

In this case the some of the packages will be downloded from different registry.

Package.lock.json — It contains the name, dependencies, and locked version of the project.

contains detail information about from where to download a package.

The goal of package-lock. json file is to keep track of the exact version of every package that is installed .