@azure/msal-node is a library that handles user authentication and token management for Node.js applications connecting to Azure Active Directory and other Microsoft identity platforms. Developers use it to implement OAuth 2.0 and OpenID Connect flows, manage user sign-in/sign-out, and securely obtain access tokens for calling protected APIs. It supports both confidential client applications (like web servers and daemons) and public client applications (like desktop apps).

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