Buy me a coffee

You should use the package github.com/pkg/errors instead of errors package for errors in your applications. The default package lacks a few things like:

• stack trace
• easy appending message to the error
• and more

It helps with debugging a lot. Below you can find an example error message with the stack trace.

An important thing to remember is that you should wrap every error which is from any external library or your freshly created error you want to return.

l, err := net.Listen("tcp4", fmt.Sprintf("%s:%d", host, port))
if err != nil {
    return errors.Wrapf(err, "cannot start listening on port %d", port)
}

or…

return errors.Wrap(MyError{}, "could not handle the situation")

If you want to add an extra message to already wrapped error, use WithMessage() function.

See Also

• Go deeper – Database connection pool
• Be aware of copying in Go
• How to send multiple variables via channel in golang?