5

I am trying to get output of log4js in JSON format so I can easily trace it. Is there any way that we have to set in configuration.json so output produced by log4js will be in JSON format?

Currently I am using following config.

{
 "appenders": [
{
  "category": "XXXXX",
  "type": "dateFile",
  "filename": "XXXXXXXX",
  "pattern": "-from-MM-dd",
  "layout": {
    "type": "messagePassThrough"
  }
},
{
  "category": "XXXXXXXXX",
  "type": "dateFile",
  "filename": "XXXXXXXX",
  "pattern": "-from-MM-dd",
  "layout": {
    "type": "messagePassThrough"
  }
}
 ],
"levels": {
"XXXXConfig":  "INFO",
"XXXXXjectConfig" : "INFO"
 }
}

and I got output is in following format : 

DEBUG:  1458562784032 : 2016-03-21T12:19:44.4444+00:00 : Data in request: : {
"action": "XXXXXXX",
"user": {
    "username": "XXXX",
     "id" : XXXX,
    "pos" : XXXX
},
"version": 111
}

instead I want it in (Something like following structure) :

{"id" : "1458562784032", "time" : "2016-03-21T12:19:44.4444+00:00", "message" : "Data in request:", "data" : "{ "action": "XXXXXXX", "user": { "username": "XXXX", "id" : XXXX, "pos: : XXXX }, "version": 111 }" }

May be there is something I missing in config.

Thanks for helping.

4

2 回答 2

4

现在有两种方法可以实现这个问题，您可以添加自己的布局或模式格式。

JSON下面是使用格式添加自己的布局的示例代码

const log4js = require('log4js');

log4js.addLayout('json', function(config) {
  return function(logEvent) { return JSON.stringify(logEvent) + config.separator; }
});

log4js.configure({
  appenders: {
    out: { type: 'stdout', layout: { type: 'json', separator: ',' } }
  },
  categories: {
    default: { appenders: ['out'], level: 'info' }
  }
});

const logger = log4js.getLogger('json-test');
logger.info('this is just a test');

于 2019-10-07T06:51:41.610 回答
0

我们可以将 bunyan 用于以 JSON 格式记录控制台日志的相同目的。这是 node 的 npm 链接：https ://www.npmjs.com/package/bunyan 。

此外，即使您想使用 log4js，也可以创建自己的模式并将日志文件写入 JSON 格式。

谢谢。

于 2016-03-24T10:30:22.040 回答