spaßig
funny
Funny, entertaining, and causing joy or laughter.
Wir hatten einen sehr spaßigen Abend mit unseren Freunden.
We had a very fun evening with our friends.

funny / joking
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funny
Funny, entertaining, and causing joy or laughter.
Wir hatten einen sehr spaßigen Abend mit unseren Freunden.
We had a very fun evening with our friends.

The adjective 'spaßig' (funny, fun) is derived directly from the noun 'der Spaß' (fun). The ending '-ig' is often used to form an adjective from a noun, meaning 'full of' or 'characterized by.'
Die Kinder fanden die spaßige Clown-Nummer toll.
The children thought the funny clown act was great.
'Spaßig' (funny, fun) belongs more to colloquial language. It is often used in informal conversations among friends or within the family.
Die Party gestern war echt spaßig.
The party yesterday was really fun.
The phrase 'Das war (nur) spaßig gemeint' (That was only meant as a joke) is a fixed expression. You use it to signal that a statement was a joke and should not be taken seriously.
Sei nicht böse, meine Bemerkung war doch nur spaßig gemeint.
Don't be upset, my comment was only meant as a joke.
serious
'ernst' and 'spaßig' are often opposites when it comes to whether something is meant as a joke or not. Use 'ernst' when someone really means something or when a situation is not funny. 'spaßig' describes something funny or something that is meant only as a joke. The words can easily be confused because a sentence may sound funny but still be meant seriously. Ask yourself: Is the statement meant to be believed and taken seriously? Then it is 'ernst'. Is it mainly meant to entertain or not be taken literally? Then it is 'spaßig'.

Seine Bemerkung war nur spaßig gemeint, aber nicht alle haben gelacht.
His comment was only meant as a joke, but not everyone laughed.
Im Gespräch mit der Ärztin merkte ich schnell, dass die Warnung ernst war.
In the conversation with the doctor, I quickly realized that the warning was serious.