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This is an optional appender for log4js-node.
npm install @log4js-node/logstashudpThe logstashUDP appender supports sending log events to a Logstash server. It uses the node.js core UDP support, and so requires no extra dependencies. Remember to call log4js.shutdown in your application if you want the UDP socket closed cleanly.
log4js.configure({
appenders: {
logstash: {
type: '@log4js-node/logstashudp',
host: 'log.server',
port: 12345
}
},
categories: {
default: { appenders: ['logstash'], level: 'info' }
}
});
const logger = log4js.getLogger();
logger.info("important log message", { cheese: 'gouda', biscuits: 'hobnob' });This will result in a JSON message being sent to log.server:12345 over UDP, with the following format:
{
'@version': '1',
'@timestamp': '2014-04-22T23:03:14.111Z',
'host': 'yourHostname',
'level': 'INFO',
'category': 'default',
'message': 'important log message',
'fields': {
'biscuits': 'hobnob',
'cheese': 'gouda'
}
}log4js.configure({
appenders: {
logstash: {
type: '@log4js-node/logstashudp',
host: 'log.server',
port: 12345,
extraDataProvider: loggingEvent => ({
host: 'anotherHostname', // this will replace the default real host
clientIp: '1.2.3.4', // this will be added
fields: {
tag: 'myTag', // this will be added to the fields
pid: loggingEvent.pid, // this will be added to the fields
cheese: 'defaultCheese' // this will be added to the fields but will not be replaced in this example
}
})
}
},
categories: {
default: { appenders: ['logstash'], level: 'info' }
}
});
const logger = log4js.getLogger();
logger.info("important log message", { cheese: 'gouda', biscuits: 'hobnob' });This will result in a JSON message being sent to log.server:12345 over UDP, with the following format:
{
'@version': '1',
'@timestamp': '2014-04-22T23:03:14.111Z',
'host': 'anotherHostname',
'level': 'INFO',
'category': 'default',
'message': 'important log message',
'clientIp': '1.2.3.4',
'fields': {
'cheese': 'defaultCheese',
'tag': 'myTag',
'pid': 123
}
}So, if not using the default extraDataProvider, you have to put the second param of the log to the fields yourself if you want.
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