What Is React Router and How Does Client-Side Routing Work?
React Router powers navigation in single-page React apps. Here is what it is, how client-side routing works, and why it matters.
What Is React Router and How Does Client-Side Routing Work?
React Router is how multi-page navigation works in a single-page React app. Here is what it is and how client-side routing actually works.
What React Router Is
React Router is a library that lets you navigate between different views in a React app without a full page reload. It keeps the URL in sync with what is shown.
Client-Side vs Server-Side Routing
In server-side routing, every link triggers a full page reload from the server. In client-side routing, JavaScript intercepts the navigation, updates the URL, and swaps the view, all without reloading the page.
Why Client-Side Routing Matters
It makes a React app feel instant and smooth. The browser does not re-download HTML, CSS, and JS on every navigation, so transitions are fast and state can be preserved.
How React Router Works
You define routes that map URL paths to components. When the URL matches a route, React Router renders the corresponding component. Links update the URL without a reload.
The Browser History API
Under the hood, React Router uses the browser History API to update the URL and listen for changes. This is what makes the back and forward buttons work.
The Takeaway
React Router gives a single-page React app multi-page navigation without reloads, by mapping URLs to components and using the browser History API. It is what makes a React app feel like a real website.
React Router is a library that lets you navigate between different views in a React app without a full page reload. It keeps the URL in sync with what is shown by mapping URL paths to components.
In server-side routing, every link triggers a full page reload from the server. In client-side routing, JavaScript intercepts navigation, updates the URL, and swaps the view without reloading the page, which makes transitions instant.
Because the browser does not re-download HTML, CSS, and JS on every navigation. JavaScript just swaps the view and updates the URL, so transitions are instant and component state can be preserved.
It maps URL paths to components. When the URL matches a route, the corresponding component renders. It uses the browser History API to update the URL and listen for changes, which makes the back and forward buttons work.
Routes where a parent renders a layout and child routes render inside it via the Outlet component. This lets you share a layout, like a header and sidebar, across multiple pages without repeating it in each one.
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