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You will be fetching data from APIs using React. The package will be installed, and we will be notified when it is finished. Import express, then initialize a new app by calling express() and saving the result to a variable called app: After creating the app, add cors as a middleware. This work is licensed under a Creative Commons Attribution-NonCommercial- ShareAlike 4.0 International License. Or the token can be an object too? Thats not a problem. Add in a handler for the /login path. By the end of this stage, we'll have a working login page as well as protected sites that can only be accessed after logging. The risk is that if a malicious user is able to load code into our app, it will have access to localStorage, sessionStorage, and any cookies that our app has access to. This library will allow all routes to share resources across origins. A custom Hook is a function that wraps custom logic. The user will be responsible for explicitly logging out. Greetings and thank you for this starting tutorial. When the installation is complete, youll receive a success message: Next, open a new file called server.js in the root of your application. sessionStorage belongs only to the specific window session. For example, you can create a new route for a login page and use React Router to redirect if the user is not logged in. We used sessionStorage and localStorage to save tokens in this stage. Open Login.js: In the previous step, you passed a new prop called setToken to the Login component. This library will enable cross origin resource sharing for all routes. Then youll render the login page on any route so that your users can login to the application without being redirected to a new page. Authentication is a crucial requirement of many applications. Add in the PropType from the new prop and destructure the props object to pull out the setToken prop. This tutorial will use nano: Inside of Dashboard.js, add an

tag with the content of Dashboard: Repeat the same steps for Preferences. We now have a working local API and an application that uses a username and password to request a token. In a large application, you would add these to a separate directory. In the next step, youll learn how to store the user token so that a session will persist across page refreshes or tabs. I am at a point of implementing a refresh token on the web app I am working on, but thus far the internet has not been of big help. For a detailed introduction to creating an Express server, see the tutorial Basic Express Server in Node.js. If you want to save the token across tabs, youll need to convert to localStorage. Simplilearn is one of the worlds leading providers of online training for Digital Marketing, Cloud Computing, Project Management, Data Science, IT, Software Development, and many other emerging technologies. We'll construct a local API to get a user token in this stage. Public pages are available to anyone, while a private page requires a user login. Youll implement different token storage options and learn the security implications of each approach. This can lead to security vulnerabilities. The benefit of the non-memory storage methods is that you can reduce the number of times a user will need to log in to create a better user experience. Youll start by installing React Router and creating components to represent a full application. Last but not least, start the server on port using app.listen. Check out the tutorial How To Call Web APIs with the useEffect Hook in React for a detailed look at calling APIs in React components. It is very detailed and thorough. thanks in advancem cheers!!. If a user is not authenticated, we'll provide them the option to log in before allowing them to proceed without having to go to a separate login page. We'll get a response that says the server is setting up: API is running on http://localhost:8080/login. If you would like to read more React tutorials, check out our React Topic page, or return to the How To Code in React.js series page. Be sure that you are importing App.css so that you can apply the styles. When a user tries to access a private page before logging in, our React application will need to handle it. In this case, you already have a token stored, so when the browser refreshes, you will navigate to the private pages: Clear out the token by either deleting the token in the Storage tab in your developer tools or by typing sessionStorage.clear() in your developer console. Open useToken.js to convert to localStorage. We'll get a success message when the installation is finished. You will need to log in again since there is no token yet in localStorage, but after you do, you will remain logged in when you open a new tab. In a new terminal window or tab, start the server: You will receive a response indicating that the server is starting: Visit http://localhost:8080/login and youll find your JSON object. Originally created by Facebook, it has gained popularity by allowing developers to create fast applications using an intuitive programming paradigm that ties JavaScript with an HTML-like syntax known as JSX. In the next step, youll create a local API that will return a user token. Login.js is now open. This tutorial will focus on storing tokens in localStorage and sessionStorage. It makes the related component visible. There are costs and benefits to each approach. We'd like to help. Now, its up to us to add some styling which is completely optional. To convert to localStorage, open useToken.js: Then change every reference of sessionStorage to localStorage. If you have any doubts or queries regarding the courses or this article, feel free to drop them in the comments section below. A public page is open to the public, but a private page requires a user login. This image is from Firefox, but youll find the same results in Chrome or other modern browsers. Container components in a React app are widely known as the parent elements of other components. If you try to access a property, you will generate an error. When you log in, the browser saves the token, but you still see the login page. Warning: Do not enable CORS for all routes in a production application. By the end of this step, youll be able to choose a storage approach based on the goals for your application. In React, React Router is a standard library for routing. Next, create a function to make a POST request to the server. In this example, youll add the service directly to the component. However, each team will be different. Any information that is stored outside of the memory of the current application is vulnerable to Cross-Site Scripting (XSS) attacks. Finally, when the form is submitted, we call our callback handleSubmit. ReactJS is a Javascript library for creating user interfaces that is quite popular and frequently used. By convention, custom Hooks start with the keyword use*. The primary advantage of a custom Hook is that you can remove the implementation logic from the component and you can reuse it across multiple components. I still have to go through docs for some parts!! A React development environment set up with Create React App, with the non-essential boilerplate removed. This tutorial will cover sessionStorage and localStorage, since these are more modern than using cookies. Youll still need to set some state that will trigger a re-render when the data changes. The login page will then be rendered on any route, allowing our users to log in without being transferred to a new page. Installing the web version is preferred. Your React application will need to handle situations where a user tries to access a private page before they are logged in, and you will need to save the login information once they have successfully authenticated. Theres a little problem now. This can be more convenient, since it lets users open multiple windows and tabs without a new login, but it does have some security problems. You also created a custom Hook to trigger a component re-render and to move component logic to a separate function. We'll make a mock API that returns a user token, a login page that fetches the token, and a check for authentication that doesn't require rerouting the user. You can take up any of these courses to upgrade your skills and advance your career. A Controlled Component is a pattern in React that displays the current form value as a state variable and sets the new one when the user inputs something. But moving the custom Hook to a different file will show how Hooks work outside of a component. You now have a working local API and an application that requests a token using a username and password. When you do, the browser will reload and youll find your basic components: Check each of the routes. You can learn about working with APIs in How To Call Web APIs with the useEffect Hook in React. The danger is that if a malicious user is able to load code into your application, it can access localStorage, sessionStorage, and any cookie that is also accessible to your application. Facebook and other individual developers/companies keep it up to date. Install the web version: The package will install and youll receive a message when the installation is complete. Sign up for Infrastructure as a Newsletter. Create a function that performs a POST request to the server. The program comprises a variety of software development courses, ranging from the fundamentals to advanced topics. For now, you can store the token in memory using the useState Hook. Since the server is not a requirement of the final build, be sure to install as a devDependency. To test the benefits of storing outside of memory, convert the in-memory storage to sessionStorage. By the end of this tutorial, youll be able to add authentication to a React application and integrate the login and token storage strategies into a complete user workflow. import Button from "react-bootstrap/Button"; const [password, setPassword] = useState(""); return email.length > 0 && password.length > 0; onChange={(e) => setEmail(e.target.value)}, , onChange={(e) => setPassword(e.target.value)}, . It aids developers in creating web pages that can alter data without having to restart the page. app.listen(8080, () => console.log('API is running on http://localhost:8080/login')); The file should be saved and closed. Destructure the props object to extract the setToken prop and add the PropType from the new prop. You can find detailed information about uncontrolled components in How To Build Forms in React. You also learned about how sessionStorage and localStorage affect the users ability to start new sessions without login. Add cors as a middleware after we've finished building the app. Both public and private pages can be found on a website. Any data will not be available in a new tab and will be lost when the active tab is closed. Be sure to set the input type for the password to password: For more on forms in React, check out the tutorial How To Build Forms in React. Without requiring a login, the next user would have immediate access to the application. When you do the browser will reload. The Best Guide to Understanding React and Express, The Complete Guide to Using AI in eCommerce, React With Redux Tutorial: Learn the Basics, How to Create a Login Page In ReactJs? Because there is no token in localStorage yet, we will need to log in again, but once we do, we will remain logged in when we open a new tab. The callback takes a req argument, which contains the request data and a res argument that handles the result. New values have been assigned to the variables, email and password. Now, below our home , we add the following line to src/Routes.js to connect this container to the rest of our project. The token is now saved in JavaScript memory, using a local state. Inside of setToken, save the userToken argument to sessionStorage using the setItem method. Notice that if you visit http://localhost:3000/dashboard, youll still find the login page since the token has not yet been set: In this step, you created an application with private components and a login component that will display until you set a token. Now that our API server is up and running, we must make a request from our login page. The first argument is the path the application will listen to and the second argument is a callback function that will run when the application serves the path. LocalStorage, unlike sessionStorage, saves data long after the session has ended. nano src/components/Dashboard/Dashboard.js. To begin, download and install express. Create an async function called loginUser. If you visit http://localhost:3000/dashboard, youll find the dashboard page: Your routes are working as expected, but there is a slight problem. Get started NOW! The author selected Creative Commons to receive a donation as part of the Write for DOnations program. ReactJS is preferred by many Fortune 500 companies because of its numerous useful features. After creating some components, we'll need to import them and define routes in App.js. This will fetch the token and set it as the initial state: Next, copy the setToken function from App.js.