Node.js - logging / Use morgan and winston

Question

we use morgan in order to log our express transformation:

var morgan  = require('morgan'); morgan('combined'); // a format string morgan(':remote-addr :method :url :uuid'); // a custom function morgan(function (req, res) {   return req.method + ' ' + req.url + ' ' + req.uuid; }) 

Also, we use winston in order to log our other logging:

var winston = require('winston'); var logger = new (winston.Logger)({   transports: [          new (winston.transports.Console)({ level: 'info' }),           new (winston.transports.File)({ filename: '/var/log/log-file.log' })   ] }); 

Is there any way to combine the two loggers together? the situation now is that morgan is write to my standard output, when winston writes to /var/log/log-file.log.

I wish that the logger file will combine from the express transformation information, and from the other information I want (logger.info())..

Answer 1

This article does an excellent job for what you want to do.

http://tostring.it/2014/06/23/advanced-logging-with-nodejs/

For your specific code you probably need something like this:

var logger = new winston.Logger({     transports: [         new winston.transports.File({             level: 'info',             filename: './logs/all-logs.log',             handleExceptions: true,             json: true,             maxsize: 5242880, //5MB             maxFiles: 5,             colorize: false         }),         new winston.transports.Console({             level: 'debug',             handleExceptions: true,             json: false,             colorize: true         })     ],     exitOnError: false });  logger.stream = {     write: function(message, encoding){         logger.info(message);     } };  app.use(require("morgan")("combined", { "stream": logger.stream })); 

This will set up Winston to write a log to the console as well as a file. Then you can use the last expression to pass output from the morgan middleware into winston.

Answer 2

In Typescript:

let logger = new (winston.Logger)({     exitOnError: false,     level: 'info',     transports: [         new (winston.transports.Console)(),         new (winston.transports.File)({ filename: 'app.log'})     ] })  class MyStream {     write(text: string) {         logger.info(text)     } } let myStream = new MyStream() app.use(morgan('tiny', { stream: myStream }));