How to run nodejs with vs code

VS Code is a very popular code editor that supports multiple programming languages. Among them, Node.js is a very common server-side JavaScript environment. Running Node.js in VS Code allows us to develop and debug our back-end applications more conveniently. So, how to run Node.js in VS Code? This article will tell you.

1. Install Node.js

The first step is to make sure Node.js is installed. If you already have Node.js installed, you can skip this step. If it is not installed, you can follow the steps below to install Node.js:

1. Open the Node.js official website: https://nodejs.org/zh-cn/
2. Click to download Button to download the latest version of Node.js
3. Follow the step-by-step instructions to install Node.js
4. After the installation is complete, enter the following command in the terminal or command line to check whether Node.js is installed successfully:

node -v

If the version number of Node.js is output, then Node.js has been installed successfully.

2. Use VS Code to run Node.js

After successfully installing Node.js, the next step is to create a Node.js project in VS Code.

1. Open VS Code
2. Create a new folder to store our project
3. Create a new JavaScript file in the folder, such as app.js
4. Write our Node.js code in app.js, for example:

const http = require('http');

const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('Hello, World!
');
});

server.listen(3000, () => {
  console.log('Server running at http://localhost:3000/');
});

This code creates an HTTP server, listens on port 3000, and returns a Hello , the response of World!

5. Open the terminal in VS Code and execute the following command to install the debugging tool for Node.js:

npm install -g node-inspect

6. Press F5 or click in VS Code Debug button, enter debug mode
7. In the debugging panel of VS Code, select Node.js
8. Add a configuration in the launch.json file to launch our Node.js application. Example:

{
  "type": "node",
  "request": "launch",
  "name": "Launch Program",
  "program": "${workspaceFolder}/app.js",
  "restart": true
}

Change based on your actual file path.

9. Click the Run button in the debug panel to start our Node.js application. At this point, the Node.js execution environment has been started in VS Code, and the debugger can work normally.
10. Visit http://localhost:3000/ in the browser and you will see the response of Hello, World!.

3. Debugging Node.js

The advantage of running Node.js in VS Code is that we can debug easily. The following are some basic operations for debugging Node.js in VS Code:

1. Set breakpoints: Click the code line number in VS Code to set a breakpoint. Once the code executes to the breakpoint, the program will pause execution, and we can analyze the execution process of the code in the debugger.
2. Monitor variables: In the debugger, you can view the value of the variable, as well as information such as the type and scope of the variable.
3. Trace call stack: The debugger can trace the call stack of code execution, and we can view the calling process of each function in the call stack.
4. Simulating exceptions: During the running of the program, we can simulate exceptions in order to test exception handling.

The above is the basic operation method of running Node.js in VS Code, as well as the basic operation of debugging Node.js. Through these operations, we can develop and test our backend applications more conveniently.

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