20 React Router Interview Questions and Answers

React Router is a popular JavaScript library used for routing in React applications. If you’re applying for a position that involves React, it’s likely that you’ll be asked questions about React Router during your interview. Knowing how to answer these questions can help you impress the hiring manager and improve your chances of getting the job. In this article, we discuss the most commonly asked React Router questions and how you should respond.

React Router Interview Questions and Answers

Here are 20 commonly asked React Router interview questions and answers to prepare you for your interview:

1. What is React Router?

React Router is a library that helps developers manage and navigate different routes in their React applications. React Router makes it easy to declare and render different components for each route, and also keeps your application’s state updated as you navigate between routes.

2. Can you explain the main benefits of using React Router?

React Router is a popular routing library for React that provides a number of benefits over other options. First, it offers a simple, declarative API that makes it easy to specify routes and map them to components. Second, React Router is designed to work with React’s component-based architecture, making it a natural fit for React applications. Finally, React Router is highly configurable and can be extended to meet the needs of any application.

3. Is it possible to use React Router with server-side rendering? If yes, then how?

Yes, it is possible to use React Router with server-side rendering. The way to do this is to use the StaticRouter component on the server, and then use the BrowserRouter component on the client.

4. How does browser history work in React Router?

React Router uses browser history in order to keep track of the current location within the app. This allows the user to use the back and forward buttons in their browser in order to navigate through the app.

5. What are some examples of a router in React Router?

A router in React Router is any object that provides the functionality for routing, such as React Router DOM and React Router Native.

6. Can you give me an example of where and how you would use React Router?

React Router is a library that helps with routing in React applications. It provides a set of components and functions that allow you to declaratively define your application’s routes, which makes it easy to keep your application’s UI in sync with the current URL. React Router is also flexible, so it can be used in a variety of different ways, such as in single-page applications, or in applications that use server-side rendering.

7. Do all routers have to be declared on a single page or can they be spread across multiple pages?

React Router can be spread across multiple pages. However, each router will need to be declared on a separate page.

8. What is nested routing?

Nested routing is when you have routes within other routes. This can be useful if you want to create a hierarchy of pages, for example if you have a blog with different categories and you want each category to have its own page with a list of posts. To do this, you would create a route for each category, and then nest the route for the posts within that.

9. What are breadcrumbs used for in React Router?

Breadcrumbs are typically used as a navigational aid, allowing users to keep track of their location within a website or application. In React Router, breadcrumbs can be used to dynamically generate a trail of links based on the user’s current location. This can be especially helpful in large applications with complex routing.

10. What do you understand about the ‘to’ attribute in React Router?

The ‘to’ attribute is used to specify the route that the user should be redirected to when they click on a link. The value of the ‘to’ attribute can either be a string, which will be interpreted as a relative path, or an object, which can specify the absolute path, query parameters, and so on.

11. What’s the difference between ‘exact path’ and ‘path’?

The ‘exact path’ prop tells React Router that the given route should only be matched if the pathname is exactly the same as the route’s path. The ‘path’ prop, on the other hand, will match any pathname that starts with the route’s path.

12. What are named components in React Router?

Named components are simply React components that have been given a name attribute. This is used by React Router to automatically match up the component with the corresponding route.

13. Why should I use Route render methods instead of children?

Route render methods offer a higher level of flexibility than the children prop. With a render method, you have access to the entire React component lifecycle, so you can perform actions before the component is rendered, or after it is updated. You also have access to the router props, so you can use the router’s history object to programmatically change the route.

14. Why aren’t we able to access this.props.history inside our component when using react-router v4?

The reason we are not able to access this.props.history inside our component when using react-router v4 is because the router has been removed from the component’s context. In order to access the router’s history object, we need to use the withRouter Higher Order Component.

15. What are the differences between react-router-dom and react-router-native?

React-router-dom is a package that is designed for use with web applications, while react-router-native is intended for use with mobile applications. The two packages have different APIs and functionality, so it is important to choose the one that is best suited for your project.

16. What are some ways that you can share data among routes in React Router?

There are several ways that you can share data among routes in React Router. One way is to use the browser’s built-in sessionStorage or localStorage API. Another way is to use a library like React Router Redux, which provides a Redux store that can be used to share data among routes. Finally, you can also use React’s context feature to share data among routes.

17. How do you match only one route from a list of similar ones?

You can use the “exact” prop on a Route component. This will make sure that the route only matches if the path is an exact match.

18. How do you pass props to a component rendered by a ?

You can use the render prop on the component. The render prop takes a function as a prop and the function will receive the match props as an argument. The function should return a React element.

“`
path=”/some-path”
render={(matchProps) => (

)}
/>
“`

19. What is activeClassName and what is its usage in React Router?

ActiveClassName is a prop that can be passed to a React Router component. It is used to specify the class name that should be applied to the element when it is active. This can be used to style the element differently when it is active, which can be helpful for indicating to the user which page they are currently on.

20. What is the best way to allow users to navigate between different routes without using links?

The best way to allow users to navigate between different routes without using links is to use the React Router. React Router is a library that allows you to declaratively specify which components should be rendered for which routes. This means that you can specify the behavior of your app without having to hardcode links between different pages.