Node.js 中的每个请求日志记录

使用Node.js编写服务器端应用程序时，我们经常需要记录每个请求的日志信息。这对于排查问题、监控应用程序的性能以及分析用户行为非常重要。在本文中，我们将探讨如何在Node.js中记录每个请求的日志，并提供一些案例代码作为参考。

javascript
const express = require('express');
const morgan = require('morgan');
const app = express();
app.use(morgan('combined'));
app.get('/', (req, res) => {
  res.send('Hello, World!');
});
app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

::1 - - [30/Sep/2021:12:00:00 +0000] "GET / HTTP/1.1" 200 13 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.61 Safari/537.36"

javascript
const express = require('express');
const morgan = require('morgan');
const app = express();
app.use(morgan(':method :url :status :response-time ms'));
app.get('/', (req, res) => {
  res.send('Hello, World!');
});
app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

GET / 200 10.123 ms

javascript
const express = require('express');
const morgan = require('morgan');
const fs = require('fs');
const path = require('path');
const app = express();
const accessLogStream = fs.createWriteStream(path.join(__dirname, 'access.log'), { flags: 'a' });
app.use(morgan('combined', { stream: accessLogStream }));
app.get('/', (req, res) => {
  res.send('Hello, World!');
});
app.listen(3000, () => {
  console.log('Server is running on port 3000');
});