Node JS Libraries

If you’re logging to a database or an external service, querying logs can be useful. For instance, with MongoDB and winston-mongodb, you can query logs like this:

For managing log file sizes and rotation, you can use the winston-daily-rotate-file transport. Install it first: Then configure it like so:

Winston supports creating custom transports to log messages in unique ways. Here’s a basic example of a custom transport:

Winston can handle uncaught exceptions and unhandled rejections.

You can send logs to multiple destinations. For example, you might want to log errors to a file and info messages to the console.

Winston provides several formats to structure your logs. You can also create custom formats. This example combines a timestamp and JSON format.

Winston uses different log levels. By default, they are: You can configure the level of logging you want. For example, if you only want to log info and above, you set the level to info.

Here’s a simple example to get you started:

Here’s a simple example to get you started:

First, you need to install Winston via npm. Open your terminal and run: