Question 1

How to rotate log files in Winston?

Accepted Answer

Winston doesn't include built-in rotation; you need to use third-party transports like winston-daily-rotate-file. Install it separately and configure it as a transport in your logger instance for automatic file rotation.

Question 2

Winston vs Pino: which is better for performance?

Accepted Answer

Pino is generally faster for JSON logging with lower overhead, making it ideal for high-throughput applications. Winston offers more flexibility with transports and formats, but at the cost of higher resource usage in complex setups.

Question 3

How to add custom metadata to Winston logs?

Accepted Answer

Use child loggers with the .child() method to inherit metadata, or pass additional properties in the info object when logging. The README shows examples with requestId and structured meta objects.

Question 4

Can Winston handle async logging?

Accepted Answer

Yes, but it requires manual handling; transports use callbacks, and you can await logs by listening to the 'finish' event or implementing async transports. The default logging is synchronous unless configured otherwise.

Question 5

What's the best way to configure Winston for production?

Accepted Answer

Set appropriate log levels, use file transports for persistence, configure exception and rejection handlers, and avoid console logging in production. The README's quick start example provides a template with environment-based checks.

Question 6

How to query logs stored with Winston?

Accepted Answer

Use the .query() method with options like from, until, and limit, supported by transports like File and Http. This allows Loggly-like search functionality for analysis, as detailed in the Querying Logs section.

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