Printing error.localizedDescription is misleading because it displays only a quite meaningless generic error message.
So never use localizedDescription in Decodable catch blocks.
In the simple form just
print(error)
It shows the full error including the crucial information debugDescription and context.Decodable errors are very comprehensive.
While developing code you could catch each Decodable error separately for example
} catch let DecodingError.dataCorrupted(context) {
print(context)
} catch let DecodingError.keyNotFound(key, context) {
print("Key '\(key)' not found:", context.debugDescription)
print("codingPath:", context.codingPath)
} catch let DecodingError.valueNotFound(value, context) {
print("Value '\(value)' not found:", context.debugDescription)
print("codingPath:", context.codingPath)
} catch let DecodingError.typeMismatch(type, context) {
print("Type '\(type)' mismatch:", context.debugDescription)
print("codingPath:", context.codingPath)
} catch {
print("error: ", error)
}
It shows only the most significant information.