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log4js-node:node.js日志框架输出到文件


文档

  • github:​​https://github.com/log4js-node/log4js-node​​
  • doc​​https://log4js-node.github.io/log4js-node/​​
  • npmjs​​https://www.npmjs.com/package/log4js​​

安装

node -v
v16.14.0

pnpm install

package.json

{
"type": "module",
"dependencies": {
"log4js": "^6.6.1"
}
}

示例

import log4js from "log4js";

const logger = log4js.getLogger();
logger.level = "debug";
logger.debug("Some debug messages");

运行输出

$ node app.js
[2022-08-14T17:28:38.108] [DEBUG]

自定义配置,输出到文件

// log4js.config.js
export default {
appenders: {
output: {
type: "file",
filename: "logger.log",
maxLogSize: "1K", // K, M, G
backups: 3,
compress: false,

layout: {
type: "pattern",
pattern: "[%d{yyyy-MM-dd hh:mm:ss}] [%p] %f{1} line-%l: %m",
},
},
},
categories: {
default: {
appenders: ["output"],
level: "debug",
enableCallStack: true
},
},
};

// app.js
import log4js from "log4js";
import log4jsConfig from "./log4js.config.js";

// 配置
log4js.configure(log4jsConfig);

const logger = log4js.getLogger();

logger.debug("Some debug messages");

输出格式如下

[2022-08-14 18:14:08] [DEBUG] app.js line-18: Some debug messages


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