How Can I Print Error Line Numbers in Go's Standard Logging?

Printing Error Line Numbers in Golang with Standard Logging

In Go, the log.Fatal function is commonly used to log errors, but it doesn't provide information about the line where the error was triggered. This can make it challenging to debug and understand the source of the error.

Solution:

To print the line number alongside the error message, you can modify the log flags using the SetFlags function. This allows you to include either the full filepath (Llongfile) or just the filename (Lshortfile) in the log output.

For example, to set the default logger to include the line number in its output, use the following code:

log.SetFlags(log.LstdFlags | log.Lshortfile)

Now, when you call log.Fatal or any other log function with the Lshortfile flag set, it will include the filename and line number in the log message.

This approach has the advantage of using the standard logging functionality without the need for custom error handling code, making it easier for others to understand and debug your application.

By printing the line number where the error occurred, you provide valuable information that facilitates quicker error resolution and code comprehension.

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