To encode JSON data, the encoding/json package provides the Marshal function, which has the following signature:
func Marshal(v interface{}) ([]byte, error)
This function takes one parameter, which is of type interface, so pretty much any object you can think of since interface represents any type in Go. It returns a tuple of ([]byte, error), you will see this return style quite frequently in Go, some languages implement a try catch approach that encourages an error to be thrown when an operation cannot be performed, Go suggests the pattern (return type, error), where the error is nil when an operation succeeds.
In Go, unhandled errors are a bad thing, and whilst the language does implement Panic and Recover ...
