node.js - Logging in express js to a output file?

Question

What is best way to log my express js webserver? The inbuilt express.logger() just displays logs on screen. Can I also log them into a file in /log folder? Also the current logger automatically logs the request and responses. I need to log some application data into the log files. Can this be done using express.logger?

Regards, Lalith

Answer 1

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.