Client Side Data Fetching in NextJS | NextJS in Hindi

Summary

In this video, the concept of client-side rendering is explained, focusing on how data is fetched from an API and displayed on the screen in a React application. The tutorial covers the steps of setting up a client-side rendering process using hooks like `useEffect`, making API calls, and handling dynamic routing for user data display. Additionally, optimization techniques such as using SWR (stale-while-revalidate) are introduced to improve performance by reducing redundant API calls. The tutorial offers clear, step-by-step guidance for beginners looking to understand client-side rendering and data fetching in React apps.

Takeaways

• 😀 Client-side rendering in React involves fetching data from an API and rendering it on the screen after the page has loaded.
• 😀 The script explains different types of data fetching techniques such as static side rendering, client-side rendering, and incremental side generation.
• 😀 Client-side rendering requires using React's useEffect hook to manage the data-fetching process after the component has mounted.
• 😀 The script demonstrates how to create a simple React component (User Page) that fetches and displays user data from a dummy API.
• 😀 Dynamic routing in React is discussed, where a specific user’s information can be displayed dynamically when clicked, based on their ID.
• 😀 API calls can be made using the fetch function or specialized libraries, with data being stored in the component's state after fetching.
• 😀 Error handling is crucial in client-side rendering. If the data is not available or an error occurs, an error message or loading state should be displayed.
• 😀 The script introduces the concept of using 'SWR' (Stale While Revalidate) for data fetching optimization, which helps reduce redundant API calls by caching results.
• 😀 The demo includes a dynamic routing approach where the user ID is used in the URL to fetch specific user details from an API.
• 😀 The importance of ensuring that the application does not crash when data is not immediately available is emphasized, with conditional rendering techniques suggested.

Q & A

What is data setting in the context of this video?

Data setting refers to the process of fetching data from an API and rendering it on the client-side screen. It involves obtaining data and displaying it within an app or a webpage.

What are the different types of data packing techniques discussed in the video?

The video mentions several types of data packing techniques, including client-side rendering, static generation, and incremental static regeneration.

What is client-side rendering (CSR), and why is it considered easy to understand?

Client-side rendering (CSR) is a technique where the client-side (the browser) fetches data from an API and renders it on the screen. It is easy to understand because the data is fetched and displayed after the page is loaded on the client side, making it intuitive.

What role do hooks like `useEffect` and `useState` play in client-side rendering?

`useEffect` is used to trigger the fetching of data when the component mounts, and `useState` is used to store and manage the fetched data in the component's state. Together, they help in updating the UI when the data is fetched and ensures the page reflects the latest state.

How does the API call work in client-side rendering according to the video?

When a page is loaded, an API call is made to fetch data (e.g., user data from a dummy API). Once the data is fetched, it is stored in the component’s state using `useState`, and the component re-renders to display the updated data.

What is the issue faced when the data is not loaded in time during client-side rendering?

If the data is not loaded in time, the application might crash or display errors. This can be handled by adding checks to ensure that data is available before rendering it, such as verifying if the data exists before attempting to display it.

What is the solution provided for handling dynamic user data rendering?

To handle dynamic user data rendering, the video suggests creating dynamic routes for individual user pages. When a user is clicked, the application fetches specific user data based on the user’s ID from the API and displays it on the screen.

What are dynamic routes, and how are they used in the video?

Dynamic routes are URL paths that can change based on parameters (e.g., a user’s ID). In the video, dynamic routes are created to show individual user details. For example, clicking on a user's name takes you to a dynamic URL that fetches that user’s specific information.

How does the video suggest optimizing client-side rendering for better performance?

The video suggests using a feature called 'SW', which stands for Service Worker. This allows data to be cached and reduces the need to make repeated API calls, improving performance by fetching data only when necessary.

What is the difference between static generation and client-side rendering?

Static generation involves rendering data at build time and serving it as a static file, whereas client-side rendering fetches and displays data dynamically in the browser after the page loads. Static generation is faster because it doesn't require API calls during page load.