Whenever you develop a React-Application there will be the need to restrict unauthenticated users to access certain parts of your application.
React Router is my library of choice when it comes to routing for React, but there is no built-in way to protect a <Route> from unrestricted access. In this post I will show you how to easily build your own guarded routes.
First run npx create-react-app route-guard on your command line to bootstrap a new React-Application.
Second run npm start inside the newly created route-guards folder to check if everything is working properly.
As a result you should see the create-react-app default page in your browser:
Now we install React Router by running npm install react-router-dom, in order to set up some basic routes which we guard later.
Additionally set up three new React components to which we can route:
Import the BrowserRouter into your App.js component and set up a <Router> with two routes.
Your App.js should look like this:
In a next step we display three links inside the App.js component to easily navigate from one page to another.
Import Link from react-router-dom and add the following lines to the top of the <Router> of your app component:
Hereby the basic setup is completed, now we can look into authentication and how to guard a <Route>.
Before we can add route guarding we need to add a fake authentication.
Underneath the Navigation we add a Login and a Logout button with an onClick handler that points to the corresponding functions that we define right at the top of the component.
We use the use Statehook to save the current user login state inside the state of the component.
The App.js component should now look like this:
Now we want to guard the protected page from unrestricted user access.
We need to write a GuardedRoute which wraps a normal React-Router <Route>:
Now we can use the new component inside the App.js component.
<GuardedRoute path='/protected' component={Protected} auth {isAutheticated} />
Let me explain the code above:
First of all we create a new component wrapping a React-Router <Route>. Then we rename the component prop to Component because in JSX lowercase tag names are considered html tags so component names should always start uppercase. Inside the render of the <Router> component we check if the user is authenticated. If true, display the protected component. If false we redirect to Home.js.
Now we are finished with the implementation. Restart your application and test the different <Routes>. It should not be possible to reach the protected component if your are not logged in. If you try to reach the protected page the application redirects to the home page.
You can find the final code in my GitHub repo:
Credits
The article was influenced by the following works on a similar topic:
Zu diesem Thema