How to get the request address in nodejs

Node.js is a server-side JavaScript running environment based on the Chrome V8 JavaScript engine. In many web applications, we need to obtain the request address in order to perform corresponding logical processing. This article will briefly introduce the method of obtaining the request address in Node.js. I hope it will be helpful to everyone.

1. Method of obtaining the request address

In Node.js, you can use req.url to obtain the request address. req is a core module of Node.js, indicating the relevance of the current request. Information, including request address, request method, request header, etc. The req object is a readable stream. You can obtain the information in the request body by listening to the data and end events, and you can also obtain relevant information by listening to other events. The following is a simple example:

const http = require('http');

const server = http.createServer((req, res) => {
  console.log(req.url); // 获取请求地址
  res.end('Hello World');
});

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

In the above code, we use the http module to create an HTTP server, obtain the request address by listening to the request address, and finally send back a "Hello World" to the client. String. Run the code. When we access http://localhost:3000/test, the console will output "/test", indicating that the request address has been obtained.

2. Method of parsing the request address

Sometimes, we need to parse the request address, such as obtaining parameters, paths, etc. in the request. Node.js provides the url module for this Analysis, this module is one of the core modules of Node.js and can be used without installation. The following is an example of using the url module to parse the request address:

const http = require('http');
const url = require('url');

const server = http.createServer((req, res) => {
  const requestUrl = req.url;
  const parsedUrl = url.parse(requestUrl, true); // 解析请求地址
  const path = parsedUrl.pathname; // 获取路径
  const query = parsedUrl.query; // 获取查询参数
  console.log('path:', path);
  console.log('query:', query);
  res.end('Hello World');
});

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

In the above code, we use the url module to parse the request address. The parse method can parse the request address into an object, including the path and Query parameters and other information, when the second parameter is true, the query parameters can be parsed into objects. Run the code. When we visit http://localhost:3000/test?name=Tom&age=20, the console will output:

path: /test
query: { name: 'Tom', age: '20' }

3. Conclusion

Get it in Node.js The request address is very simple. You only need to use req.url to obtain it. To parse the request address, you can use the Node.js built-in module url to parse. You can also use third-party modules such as express to simplify the operation. Of course, for complex web applications, more advanced parsing methods may be needed, which requires different methods to be chosen according to specific situations.

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