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Table of Contents
Configure launch.json file
Using debugger in code
Use React Developer Tools to assist in troubleshooting problems
Home Development Tools VSCode How to debug a React application in VSCode?

How to debug a React application in VSCode?

Jul 09, 2025 am 01:47 AM

The key to debugging React applications in VSCode is to configure the debugger and use it in conjunction with browser tools. 1. Configure the launch.json file, add Chrome debugging settings, and specify url and webRoot; 2. Insert debugger statements in the code to achieve temporary breakpoints; 3. Use the React Developer Tools plug-in to assist in troubleshooting component problems, and check quickly for positioning errors through component trees, props and state. After correct configuration, VSCode can communicate with the browser to achieve efficient debugging process.

How to debug a React application in VSCode?

Debugging React applications is not complicated in VSCode. As long as it is configured properly, it can break points, view variables, and call stacks as conveniently as in the browser. The key is to set up the debugger correctly and use it in conjunction with Chrome or Edge debugging tools.

How to debug a React application in VSCode?

Configure launch.json file

VSCode itself does not directly run debugging logic, but implements debugging by extending communication with the browser. The most common way is to use Debugger for Chrome or the built-in JS Debugger (Nightly) .

How to debug a React application in VSCode?

You need to add a debug configuration in the .vscode/launch.json file. If you don't have this file yet, you can click "Create launch.json file" in the "Run and Debug" sidebar.

Here is an example configuration for Chrome:

How to debug a React application in VSCode?
 {
  "version": "0.2.0",
  "configurations": [
    {
      "type": "chrome",
      "request": "launch",
      "name": "Launch Chrome against localhost",
      "url": "http://localhost:3000",
      "webRoot": "${workspaceFolder}/src"
    }
  ]
}
  • url should be filled in according to the address you started locally, usually localhost:3000 .
  • webRoot points to your source code directory so that VSCode can correspond to the source code and the compiled code.

After saving, click the green start button in the Run and Debug panel to start debugging.


Using debugger in code

In addition to setting breakpoints, you can also insert it directly into the code:

 debugger;

When you refresh the page and trigger the statement, the browser will automatically pause execution and jump to the Sources panel to facilitate you to step by step or view the current context.

This method is suitable for temporarily debugging a function or life cycle hook. It does not require opening the VSCode debugger in advance, but can also be used with the browser DevTools.


Use React Developer Tools to assist in troubleshooting problems

Although not part of VSCode, the React Developer Tools browser plug-in can greatly improve debugging efficiency.

It allows you to:

  • View component tree structure
  • Check props and state
  • Quickly locate components that render errors

You can use it as an auxiliary tool with VSCode, such as first identifying the problem components through DevTools, and then returning to VSCode to set breakpoints and analyze in depth.


Basically that's it. The core of debugging React applications is to connect VSCode and the browser, and make good use of breakpoints and developer tools. It may take a few minutes to configure at the beginning, but the whole process is very smooth after you become proficient.

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