Logging NodeJs with Winston

Objective: We create log file (Daily log file: info.log.2016-08-22)  Source code github

• Show log in Console and in File

Implementation

1. Create project using Express generator 

   
   express -e winstonjs-console-and-file
   
   

   Note: if you don't have express generator you can install via command line

   
   npm install express-generator -g
   
   

2. Install Winston 

   
   npm install --save winston@0.8.3
   
   

3. Open app.js write some code

   
   var FileStreamRotator = require('file-stream-rotator');
   var fs = require('fs');
   
   var logDirectory = __dirname + '/logs'
   
   // ensure log directory exists
   fs.existsSync(logDirectory) || fs.mkdirSync(logDirectory);
   
   // create a rotating write stream
   var accessLogStream = FileStreamRotator.getStream({
     filename: logDirectory + '/access-%DATE%.log',
     frequency: 'daily',
     verbose: false,
     date_format: 'YYYY-MM-DD'
   });
   
   app.use(morgan('combined', {stream: accessLogStream}));
   
   

4. Create folder logger then file index.js 

   
   var winston = require("winston");
   
   if(process.env == 'production') {
       winston.level = 'info';
   }
   else {
       winston.level = 'debug';
   }
     
   winston.loggers.add('info', {
       console: {
          level: winston.level,
          colorize: true,
          label: 'category one'
       },
       file: {
         level: winston.level,      
         colorize: 'true',
         filename: __dirname + '/../logs/info/info.log',
         datePattern: '.yyyy-MM-dd',
         //maxsize: 20000,
         json: false
           
       },
       DailyRotateFile: {
           level: winston.level,
           colorize: 'true',
           filename: __dirname + '/../logs/info/info.log',
           datePattern: '.yyyy-MM-dd',
           //maxsize: 20000,
           json: false
       }
   });
   
   module.exports = winston.loggers.get('info');
   
   

5. How to use: call file /logger/index.js

   
   var logger = require("../logger");
   
   logger.info("This is logger.");
   
   

6. Result: It shows in Console and File

Download Source code github