How to debug a React application

Some tools you can use to debug React applications when you encounter problems

The best tool you can use to debug React applications is to utilizeReact developer tools. This is a browser extension that makes inspecting and analyzing React applications a breeze.

I wrote a blog post specifically for them, please check:React developer tools.

In addition to the React Developer Tools, which is essential for building Next.js applications, I also want to emphasize two ways to debug Next.js applications.

First it is obviousconsole.log()And allOther console APItool. The way the Next application works will make the log statements work in the browser console or in the terminal where you launched Next in the following ways:npm run dev.

In particular, if the page is loaded from the server, when you point the URL to the server, or click the refresh button (cmd/ctrl-R), any console logging will happen in the terminal.

Subsequent page transitions with a single mouse click will cause all console logging to occur inside the browser.

Remember, if you are surprised by the missing log.

Another essential tool isdebuggerstatement. Adding this statement to the component will cause the browser to pause rendering the page:

My best advice is to learn how to use these tools.The definitive guide to debugging JavaScript.

It's really great, because now you can use the browser debugger to check the values and run your application one line at a time.

If you are using Next.js, you can also use the VS Code debugger to debug server-side code. I mentioned this technology,This tutorialMake settings.

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