SharePoint Unattended HTTP Authentication

node-sp-auth is a JavaScript/TypeScript library designed for performing unattended (non-interactive) HTTP authentication against SharePoint environments, supporting SharePoint 2013 and newer, as well as SharePoint Online. It automatically determines the appropriate authentication strategy (e.g., NTLM, FBA, SAML, ADFS, Add-in only) based on provided credentials and handles credential caching for performance. The current stable version is 3.0.9. However, the package is no longer actively maintained, with no new features or versions expected. Developers are strongly advised to migrate to `@azure/msal-node` for modern SharePoint Online authentication, especially as some authentication methods, particularly those relying on the SharePoint Add-in model, will cease to function after April 2026 due to Microsoft's retirement of Azure ACS and the Add-in model.