wtf is passport-saml?

Passport-saml is a tool that lets people sign into a web application using their existing organization credentials, such as a university login or a corporate single sign-on system, instead of creating yet another username and password. It's built for applications using the Node.js and TypeScript programming ecosystem. At a high level, it handles the behind-the-scenes conversation between your app and the organization's login provider. When a user tries to access your app, this tool redirects them to their organization's sign-in page. Once they successfully log in there, the provider sends back a secure digital ticket confirming who they are. This package checks that the ticket is valid and hands your app the user's identity details, so you can let them in. The primary audience is developers building web apps that need to serve large institutions. If you're building an app for university students, you might want them to log in with their school account instead of forcing them to register a new one. Similarly, enterprise software often needs to integrate with a company's internal login system so IT administrators can centrally manage access. This tool bridges that gap. The README doesn't go into further detail, so there's limited documentation provided about advanced configuration or troubleshooting. The core purpose, however, is straightforward: it provides the wiring to make institutional single sign-on work for your application without having to build that security layer entirely from scratch.