CODEWITHSUNDEEP
node.jsevent-logwinston
fred727
fred727

Reputation: 2844

How to use Winston3 to log events in the Windows Event Log?

I would like to log messages from a nodejs service into the Windows Event Log.

I found winston-winlog and winston-winlog2 modules, but they all use old winston version.

How to make a custom Transport for Winston3 to log in the Windows Event Log ?

Upvotes: 1

Views: 924

Answers (1)

fred727
fred727

Reputation: 2844

Here is how I made thanks to node-windows module :

    const Transport      = require('winston-transport');
    const WinEventLogger = require('node-windows').EventLogger;

    class WinstonWinlogTransport extends Transport {
        constructor(opts) {
            super(opts);
            this.logger = new WinEventLogger(opts);
        }

        log(info, callback) {
            setImmediate(() => {
                this.emit('logged', info);
            });
            let {message, level} = info ;
            if ( level==='error' ) this.logger.error(message) ;
            else if ( level==='warn' ) this.logger.warn(message) ;
            else this.logger.info(message) ;
            callback();
        }
    };

Then you can create transports and add them to your winston logger :

    let myTransport = new WinstonWinlogTransport({ source: 'Label1' }) ;  // Go to "Applications" logs
    let myOtherTransport = new WinstonWinlogTransport({ source: 'Label2', eventLog: 'SYSTEM' }) ;  // Go to "System" logs

Note that your nodejs service have to be installed with administrator privilleges. (To install nodejs code as a windows service, I used WinSW)

Upvotes: 2

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