NodeJs中Express框架使用morgan中间件记录日志
Express中的app.js文件已经默认引入了该中间件var logger = require(‘morgan‘);
使用app.use(logger(‘dev‘));可以将请求信息打印在控制台，便于开发调试，但实际生产环境中，需要将日志记录在log文件里，可以使用如下代码
这样便可以将请求信息打印在根目录下的access.log文件中（注意文件路径别填错，并不会自动创建该文件）
示例：
express/connect
Simple app that will log all request in the Apache combined format to STDOUTq
Log出所有Apache请求（结合STTDOUT格式）
var express = require(‘express‘)var morgan = require(‘morgan‘) var app = express() app.use(morgan(‘combined‘)) app.get(‘/‘, function (req, res) { ?res.send(‘hello, world!‘)})vanilla http server
Simple app that will log all request in the Apache combined format to STDOUT
var finalhandler = require(‘finalhandler‘)var http = require(‘http‘)var morgan = require(‘morgan‘) // create "middleware"var logger = morgan(‘combined‘) http.createServer(function (req, res) { ?var done = finalhandler(req, res) ?logger(req, res, function (err) { ???if (err) return done(err) ????// respond to request ???res.setHeader(‘content-type‘, ‘text/plain‘) ???res.end(‘hello, world!‘) ?})})write logs to a file
single file
Simple app that will log all requests in the Apache combined format to the file access.log.
Log列出所有Apache请求到access.log中
var express = require(‘express‘)var fs = require(‘fs‘)var morgan = require(‘morgan‘)var path = require(‘path‘) var app = express() // create a write stream (in append mode)var accessLogStream = fs.createWriteStream(path.join(__dirname, ‘access.log‘), {flags: ‘a‘}) // setup the loggerapp.use(morgan(‘combined‘, {stream: accessLogStream})) app.get(‘/‘, function (req, res) { ?res.send(‘hello, world!‘)})log file rotation
Simple app that will log all requests in the Apache combined format to one log file per day in the log/ directory using the rotating-file-stream module.
每天将所有Apache请求记录到log中
var express = require(‘express‘)var fs = require(‘fs‘)var morgan = require(‘morgan‘)var path = require(‘path‘)var rfs = require(‘rotating-file-stream‘) var app = express()var logDirectory = path.join(__dirname, ‘log‘) // ensure log directory existsfs.existsSync(logDirectory) || fs.mkdirSync(logDirectory) // create a rotating write streamvar accessLogStream = rfs(‘access.log‘, { ?interval: ‘1d‘, // rotate daily ?path: logDirectory}) // setup the loggerapp.use(morgan(‘combined‘, {stream: accessLogStream})) app.get(‘/‘, function (req, res) { ?res.send(‘hello, world!‘)})split / dual logging
The morgan middleware can be used as many times as needed, enabling combinations like:
- Log entry on request and one on response
- Log all requests to file, but errors to console
- ... and more!
Sample app that will log all requests to a file using Apache format, but error responses are logged to the console:
Log所有Apache请求，错误Log到console中
var express = require(‘express‘)var fs = require(‘fs‘)var morgan = require(‘morgan‘)var path = require(‘path‘) var app = express() // log only 4xx and 5xx responses to consoleapp.use(morgan(‘dev‘, { ?skip: function (req, res) { return res.statusCode < 400 }})) // log all requests to access.logapp.use(morgan(‘common‘, { ?stream: fs.createWriteStream(path.join(__dirname, ‘access.log‘), {flags: ‘a‘})})) app.get(‘/‘, function (req, res) { ?res.send(‘hello, world!‘)})use custom token formats
Sample app that will use custom token formats. This adds an ID to all requests and displays it using the :id token.
ID Token格式
var express = require(‘express‘)var morgan = require(‘morgan‘)var uuid = require(‘node-uuid‘) morgan.token(‘id‘, function getId (req) { ?return req.id}) var app = express() app.use(assignId)app.use(morgan(‘:id :method :url :response-time‘)) app.get(‘/‘, function (req, res) { ?res.send(‘hello, world!‘)}) function assignId (req, res, next) { ?req.id = uuid.v4() ?next()}Node.js 模块之 morgan中间件记录日志
原文地址：http://www.cnblogs.com/jokerjason/p/7815040.html