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Passport  is authentication middleware for Node. It is designed to serve a singular purpose: authenticate requests. In modern web applications, single sign-on using an OAuth provider such as Facebook or Twitter has become a popular authentication method. Services that expose an API often require token-based credentials to protect access. Passport recognizes that each application has unique authentication requirements. Authentication mechanisms, known as  strategies , are packaged as individual modules. Applications can choose which strategies to employ, without creating unnecessary dependencies.

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https://skymind.ai/wiki/neural-network

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Mongoose is a JavaScript framework that is commonly used in a Node.js application with a MongoDB database. In this article, I am going to introduce you to Mongoose and MongoDB, and more importantly where these technologies fit in to your application. What Is MongoDB? Let's start with MongoDB. MongoDB is a database that stores your data as documents. Most commonly these documents resemble a JSON-like structure: 1 2 3 4 {    firstName: "Jamie" ,    lastName: "Munro" } A document then is placed within a collection. As an example, the above document example defines a  user  object. This  user  object then would typically be part of a collection called  users . One of the key factors with MongoDB is its flexibility when it comes to structure. Even though in the first example, the  user object contained a  firstName  and lastName  property, these properties are not required in every  user...