How can I format logs using Logrus in Go?

How can I format logs using Logrus in Go?

You can format logs in Logrus by using the SetFormatter method. Logrus supports several built-in formatters like JSON and Text.

Can you show me an example of using a JSON formatter?

Sure! Here's a simple example:

import (
    "github.com/sirupsen/logrus"
)

func main() {
    log := logrus.New()
    log.SetFormatter(&logrus.JSONFormatter{})
    log.Info("This is a JSON formatted log")
}

What if I want to add custom fields to my logs?

You can add custom fields using the WithFields method. For example:

log.WithFields(logrus.Fields{
    "user": "john_doe",
    "action": "login",
}).Info("User logged in")

Is it possible to log to a file instead of the console?

Yes, you can log to a file by setting the output of the logger. Here's how:

file, err := os.OpenFile("log.txt", os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
if err == nil {
    log.Out = file
} else {
    log.Info("Failed to log to file, using default stderr")
}