LDAP vs Passport: What are the differences?
What is LDAP? A lightweight directory access protocol. It is a mature, flexible, and well supported standards-based mechanism for interacting with directory servers. It’s often used for authentication and storing information about users, groups, and applications, but an LDAP directory server is a fairly general-purpose data store and can be used in a wide variety of applications.
What is Passport? Simple, unobtrusive authentication for Node.js. It is authentication middleware for Node.js. Extremely flexible and modular, It can be unobtrusively dropped in to any Express-based web application. A comprehensive set of strategies support authentication using a username and password, Facebook, Twitter, and more.
LDAP and Passport can be primarily classified as "User Management and Authentication" tools.
Passport is an open source tool with 17.8K GitHub stars and 1.04K GitHub forks. Here's a link to Passport's open source repository on GitHub.