Fix the 'declared and not used' error in Go by using a blank identifier import or referencing the package's exported names.
The error occurs because Go requires every imported package to be used at least once in the code. If you need to import a package for its side effects (like initialization) but don't use any of its exported names, prefix the import with a blank identifier _.
import (
"_ "example.com/package"
)
If you intended to use the package, ensure you reference at least one of its exported types, functions, or variables.
Go checks that every library you bring into your project is actually used to keep your code clean. If you import a library just to run its setup code without using its functions, you must tell Go to ignore the usage check by using an underscore. Think of it like buying a tool just to use the manual; you still have to tell the store you bought it, even if you never touch the tool itself.