调试

Express 在内部使用 debug 模块来记录有关路由匹配、正在使用的中间件函数、应用程序模式以及请求-响应周期的流程的信息。

debug 就像 console.log 的增强版，但与 console.log 不同的是，您不必在生产代码中注释掉 debug 日志。日志记录默认关闭，可以使用 DEBUG 环境变量有条件地打开。

要查看 Express 中使用的所有内部日志，请在启动应用程序时将 DEBUG 环境变量设置为 express:*。

$ DEBUG=express:* node index.js

在 Windows 上，使用相应的命令。

> set DEBUG=express:* & node index.js

在 express 生成器 生成的默认应用程序上运行此命令会打印以下输出：

$ DEBUG=express:* node ./bin/www
  express:router:route new / +0ms
  express:router:layer new / +1ms
  express:router:route get / +1ms
  express:router:layer new / +0ms
  express:router:route new / +1ms
  express:router:layer new / +0ms
  express:router:route get / +0ms
  express:router:layer new / +0ms
  express:application compile etag weak +1ms
  express:application compile query parser extended +0ms
  express:application compile trust proxy false +0ms
  express:application booting in development mode +1ms
  express:router use / query +0ms
  express:router:layer new / +0ms
  express:router use / expressInit +0ms
  express:router:layer new / +0ms
  express:router use / favicon +1ms
  express:router:layer new / +0ms
  express:router use / logger +0ms
  express:router:layer new / +0ms
  express:router use / jsonParser +0ms
  express:router:layer new / +1ms
  express:router use / urlencodedParser +0ms
  express:router:layer new / +0ms
  express:router use / cookieParser +0ms
  express:router:layer new / +0ms
  express:router use / stylus +90ms
  express:router:layer new / +0ms
  express:router use / serveStatic +0ms
  express:router:layer new / +0ms
  express:router use / router +0ms
  express:router:layer new / +1ms
  express:router use /users router +0ms
  express:router:layer new /users +0ms
  express:router use / <anonymous> +0ms
  express:router:layer new / +0ms
  express:router use / <anonymous> +0ms
  express:router:layer new / +0ms
  express:router use / <anonymous> +0ms
  express:router:layer new / +0ms

UaqaXTmxFrQC2Gz2FF/Eth8LA+vCn7TqTRyK5sDFL2e0XFqEi/5YrQM9bJO6t/A0oWnAcz0Agyjuv0wDs/DRWD3o/2pT9+z81Ye3TdtduDLKW1EgGuZdLAF/Al+kIwgS

  express:router dispatching GET / +4h
  express:router query  : / +2ms
  express:router expressInit  : / +0ms
  express:router favicon  : / +0ms
  express:router logger  : / +1ms
  express:router jsonParser  : / +0ms
  express:router urlencodedParser  : / +1ms
  express:router cookieParser  : / +0ms
  express:router stylus  : / +0ms
  express:router serveStatic  : / +2ms
  express:router router  : / +2ms
  express:router dispatching GET / +1ms
  express:view lookup "index.pug" +338ms
  express:view stat "/projects/example/views/index.pug" +0ms
  express:view render "/projects/example/views/index.pug" +1ms

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express 生成的应用程序

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$ DEBUG=sample-app:* node ./bin/www

7tSq9ONN6wnlgzQRYIbjACkpn0Tj4cAVcmPXuuX47opWk21fribbYiUm6Ra9jRZge2og4l38Ol+Qw9jb30mj2p7cWhqEG6BbP/ITCWXgU8PfeDplFJsm8eKUAbsyLyHh

$ DEBUG=http,mail,express:* node index.js

高级选项

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名称目的
DEBUG启用/禁用特定的调试命名空间。
DEBUG_COLORS是否在调试输出中使用颜色。
DEBUG_DEPTH对象检查深度。
DEBUG_FD要将调试输出写入的文件描述符。
DEBUG_SHOW_HIDDEN显示检查对象的隐藏属性。

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资源

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