An introduction to several methods for debugging Node.js

Related recommendations: "nodejs Tutorial"

Debugging is an essential tool for solving program problems. In the early days, debugging Node was a bit troublesome. , the community also has many toolkits to assist. Now Node debugging is relatively simple. There are several commonly used

Chrome DevTools

Chrome developer tools interact through the V8 Inspector Protoco debugging protocol and use websocket Interact with development tools, providing a graphical debugging interface, the operation is very simple

#1 Command line --inspect-brk

Use the command linenode --inspect-brk YOUR_FILE_PATH .js

#2 Browser inspect interface

Use Chrome to open the addresschrome://inspect and click Remote The file name "inspect" button for debugging in Target

#3 Enter the Chrome debugging interface

- -inspect-brk will stop the first line of user code before execution to prevent the execution of the code from ending before debugging. The web service script will always run in the background. Just use --inspect

VS Code

The above operation steps are still a little troublesome. Most IDEs have encapsulated debugging interfaces, which can truly achieve one-click debugging. VS Code is almost the de facto standard IDE for the front end. Let’s briefly introduce it. Debugging method

#1 Click the debug button

#2 Create launch.json

You need to create one for first debugging launch.json file, the default value will be generated after clicking

{
  // Use IntelliSense to learn about possible attributes.
  // Hover to view descriptions of existing attributes.
  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
  "version": "0.2.0",
  "configurations": [
    {
      "type": "node",
      "request": "launch",
      "name": "Launch Program",
      "skipFiles": [
        "<node_internals>/**"
      ],
      "program": "${file}"
    }
  ]
}

Generally, what needs to be modified is program, and the debugging file is specified through program

1. ${file} Debug the current file
2. ${workspaceFolder}\\index.js Debug the index.js entry file of the project directory

#3 Click “Launch Program”

Detailed operation and configuration reference https://code.visualstudio.com/docs /nodejs/nodejs-debugging

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