A developer demonstrates implementing the React Context API to manage global authentication state in a Next.js application. The process involves creating an AuthContext, setting up a provider component, using server actions to check authentication cookies, and conditionally rendering UI elements based on the user's login status.
Length 13:13
Captions English (Generated), Spanish (Auto-translated), French (Auto-translated), Korean (Auto-translated), Portuguese (Auto-translated), Vietnamese (Auto-translated) #react #next.js #context-api #authentication #programming #coding #web-development #server-actions #typescript #software-engineering
0:00 So the context API is essentially a way to define 0:04 some state that we want to pass in as props 0:08 in a very high-level component, like the root 0:12 component for our app where we can control it, and then we can easily 0:15 consume that state 0:18 further down the component tree without having to explicitly 0:22 re-pass it down for each component we're rendering. 0:26 Now, to see this in action, let's just go ahead 0:28 and create this context, 0:30 and it'll be much more clear how it actually works. 0:33 So in the auth directory, let's create this context called 0:37 auth-context. 0:42 And this will be simply a const called AuthContext, 0:46 and we'll set it equal to create context from 0:50 React. 0:51 So this takes in a default value to provide when we haven't set 0:55 it. So by default I'll say false, we're not authenticated. 1:00 Now we want to act- So now that we have this context, we want 1:04 to set it up as a provider, essentially 1:08 providing the source of truth for this state or context. 1:12 And to do that, we can use the layout.tsx where we're 1:15 actually 1:16 already utilizing a couple of providers that follow this same exact 1:20 pattern. So the AppRouterCacheProvider and the 1:23 ThemeProvider are using the context API 1:27 underneath the hood to actually supply some state, so in this case, 1:31 the dark theme. And then when we utilize this theme in child 1:35 components, well, we're using the context API 1:39 as a consumer and accessing that state without having to explicitly 1:43 provide this theme prop to every single child component. 1:48 Now, we have quite a few providers now, and we could have more potentially based 1:52 on if we have more shared state. So let's create a separate component 1:56 where we can actually host all of these providers. 2:00 So in the app directory, I'll create a new
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