Logging requests to the App

Express comes with a built-in logging module called logger, it can be a very useful tool while you are developing the app. You enable it like any other Express module:

app.use(express.logger());

Without any options, the logger middleware will log a detailed log. You can customize the details with the following tokens in the format option of the logger middleware:

Token	Content
:req[header]	The specific HTTP header of the request
:res[header]	The specific HTTP header of the response
:http-version	The HTTP version
:response-time	How long it took to generate the response
:remote-addr	The user agent's IP address
:date	Date and time of request
:method	The HTTP method used for making the request
:url	The requested URL
:referrer	The URL that referred the current URL
:user-agent	The user-agent signature
:status	The HTTP status

And this is how you specify the log format using the tokens:

app.use(express.logger({ format: ':remote...