Logging in express js to a output file?

To send the express or connect logs to a file use Node’s writeStream.
For example to send the express logs to ./myLogFile.log :

open the stream to your file in append mode with :

var logFile = fs.createWriteStream('./myLogFile.log', {flags: 'a'}); //use {flags: 'w'} to open in write mode

then, in your express config use :

app.use(express.logger({stream: logFile}));

should also work for connect.logger.