Access-log NPM

access-log

Add simple access logs to any http or https server

Usage

var http = require('http');
var accesslog = require('access-log');

http.createServer(function(req, res) {
  accesslog(req, res);
  res.end();
}).listen(80, '0.0.0.0');

This will automatically log requests as they come in to the web server that look like...

127.0.0.1 - - [13/Sep/2013:01:38:09 -0400] "GET / HTTP/1.1" 200 - "-" "-"
127.0.0.1 - - [13/Sep/2013:01:38:09 -0400] "GET /testing HTTP/1.1" 200 - "-" "-"
127.0.0.1 - - [13/Sep/2013:01:38:10 -0400] "GET /index.html HTTP/1.1" 200 - "-" "-"

Customization

accesslog(req, res, opts, function)

opts

Opts is an object that can contain a format identifier and userID func (both optional).

For example,

{
    userID: function (req) { return req.user; },
    format : 'url=":url" method=":method" statusCode=":statusCode" delta=":delta" ip=":ip"'
}

You can pass in a format string, the default is Apache Common Log Format http://en.wikipedia.org/wiki/Common_Log_Format

If opts is a string, it is assumed to be the opts.format property.

:ip - :userID [:clfDate] ":method :url :protocol/:httpVersion" :statusCode :contentLength ":referer" ":userAgent"

clfDate: The date of the end of the response in Apache Common Log format
contentLength: The response Content-Length header, or - if unset
delta: The time in ms from request to response
endDate: The ISO formatted string when the response was ended
endTime: The epoch time when the response was ended
host: The host header from the request if set
httpVersion: The HTTP version used (ie. 1.0, 1.1)
ip: The remote IP
Xip: The remote IP, using X-Forwarded-For if set
method: The HTTP method
protocol: HTTP or HTTPS
referer: The request Referer header, or - if unset
startDate: The ISO formatted string when the request was received
startTime: The epoch time when the request was received
statusCode: The response status code sent from the server
url: The requested URL
urlDecoded: The decoded request URL (ie. %20 => )
userID: The username if applicable
userAgent: The request User-Agent header, or - if unset

NOTE: Wrap variables in {} to protect against unwanted interpolation.

ex:

request to :url took :{delta}ms

function

You can also pass in your own custom callback, the default is console.log. The only argument passed is the access log string

Example

var format = 'url=":url" method=":method" statusCode=":statusCode" delta=":delta" ip=":ip"';

accesslog(req, res, format, function(s) {
  console.log(s);
});

yields

url="/projects" method="GET" statusCode="200" delta="0" ip="127.0.0.1"
url="/testing" method="GET" statusCode="200" delta="1" ip="127.0.0.1"
url="/index.html" method="GET" statusCode="200" delta="0" ip="127.0.0.1"