The word 'joking' is correct and can be used in written English.
It is a verb that means to say or do something intended to be humorous or not serious. Example: I couldn't believe it when my friend said she was going to skydive for the first time. At first, I thought she was joking, but when she showed me pictures of her jumping out of a plane, I knew she was serious.
Dictionary
joking
noun
The act of telling or engaging in jokes.
synonyms
Exact(60)
He wasn't joking.
You must be joking!
Ashley Williams appeared amused by the incident, joking: "I've got my passport!" The Swansea defender added: "Most people did not realise anything was wrong until we were on the plane, he is touching down any moment I think.
All his new team-mates thought their coach was joking – "You would be hard-pressed to think anything other than that the hair dye had finally seeped into Kevin Squire's brain," one told the North Devon Journal – but, sure enough, Collins bought himself a new pair of boots and featured at No8 against a rather startled Newton Abbot.
Fahmy appeared upbeat himself, joking with family members in between two scans on his injured arm, and saying the experience would be good material for a book.
I can't tell if he's joking.
I don't want to jinx it, but … Oh, you're fucking joking.
Related: Charles Kennedy death caused by alcoholism, family says The programme then cut to a vintage clip of Kennedy joking about how the Liberal Democrats were causing a shift in politics and admitting he would have been "very happy" to come second in an election.
"The response we got was overwhelming – hundreds of supporters stepped up," a spokesman said in an email, joking that the total meant Palin qualified as a co-chair of the group's national finance council.
After a while, we were no longer freaked out by the wild dogs rushing in front of the car and Roland started joking: 'We're going to have a hot dog for dinner tonight!' At Kiev airport people were walking through security and onto the plane drinking bottles of beer they'd just bought from the bar.
When the duo announced they now sounded "like Elton John", many thought they were joking.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com