Marina Posniak, UX writer at Spotify, shares some great tips on how to write error messages well.
To start, ask yourself if you even need the error message. Before writing anything, consider if there’s a way to redesign the experience so there’s no error at all. Is there a way to just make it work? (Really, the best error message is no error message.) But if you do need it, think carefully about the message. When things go wrong and the app “fails,” say something useful. The message should help the user solve the problem and move on.