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Welcome back.

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In this video, let's get started with cookie based authentication, where we are going to improve the

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previous concept by adding what is called cookie based authentication to it.

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All right.

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So let's see, what is cookie or what are cookies?

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Well, here we go.

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Cookies in programming is not real cookies, as you see in reality, but instead it is a string of characters.

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But let's see in details.

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So cookies are a small text file that is stored on your browser, which contains data from the websites

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that you visit.

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So a cookie is a kind of ways of storing data, and we can use cookies to implement what is called authentication.

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If cookies are a file that stores data.

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It means that we can store the user login details onto the file and upon every request we are going

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to check if there is user inside the cookies and that is it.

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So let's look at some facts about cookies.

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That is some properties and why do we need cookies?

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The first point is that it is used in session management.

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Like I would say that servers are stateless, but if we are able to implement session, it means that

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our server will be able to remember the log in user.

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So upon every request our server is going to check the session if there is a user and I'll show it to

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you with code, let's continue on.

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The next point is that cookies are stored with key value per and with some optional attributes, meaning

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that we can save the user name with a value and a password with a value also inside our browsers.

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The next point is that we don't need to install any package before we can use cookies by default.

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Express has this one for us, so to use cookies, you don't need to install any package from NPM or

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from the core modules, but instead express get us covered.

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The next point is that but we need a package to send back the cookie back to the server upon each request

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so our server can generate a cookie by default.

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But if you want to get a cookie from the browser into our server to check if a user has been logged

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in, we need a third party package called Cookie Parcel, meaning we are going to pass the cookie in

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the browser and then use inside our route to check the user upon each request.

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And I'll show you this one also.

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The next point is that cookies can be used to keep track user activity on the side.

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So in this case, the application can provide a personalized experience for the user, such as remembering

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the user name or any other preferences.

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And I believe you see some of these features in most applications.

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The next point is that we use cookies to store data about the current user, and this is what we call

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the use insertion management.

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So this information can be used to analyze website usage and improve the user experience.

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So additionally, cookies can be used to serve target advertising to users.

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So most advertising companies like YouTube and Facebook, they use cookies.

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In that way they can display a specific advert based on the need or your location.

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So with this one being said, the next video, let's see how we can get started with cookie based authentication.