Node.js 中 morgan 依赖及基本使用详解

npm install morgan

const express = require("express");
const morgan = require("morgan");
const app = express();
// 使用 morgan 中间件，默认日志格式为 'dev'
app.use(morgan("dev"));
app.get("/", (req, res) => {
  res.send("Hello, World!");
});
const port = 3000;
app.listen(port, () => {
  console.log(`Server running on port ${port}`);
});

GET / 200 3.029 ms - 12

const express = require("express");
const morgan = require("morgan");
const app = express();
// 自定义日志格式
morgan.token("custom-date", () => {
  return new Date().toISOString();
});
const customFormat =
  ":custom-date :method :url :status :res[content-length] - :response-time ms";
app.use(morgan(customFormat));
app.get("/", (req, res) => {
  res.send("Hello, World!");
});
const port = 3000;
app.listen(port, () => {
  console.log(`Server running on port ${port}`);
});

const express = require("express");
const morgan = require("morgan");
const fs = require("fs");
const path = require("path");
const app = express();
// 创建一个写入流（追加模式）
const accessLogStream = fs.createWriteStream(
  path.join(__dirname, "access.log"),
  { flags: "a" }
);
// 使用 morgan 并将日志写入文件
app.use(morgan("combined", { stream: accessLogStream }));
app.get("/", (req, res) => {
  res.send("Hello, World!");
});
const port = 3000;
app.listen(port, () => {
  console.log(`Server running on port ${port}`);
});