‘The Ickabog’ is a fairytale, and is Rowling's first children's story not to be connected to ‘Harry Potter’.
She wrote it more than a decade ago for her own children, and has decided to dust it off during the pandemic, BBC wrote.
It's for "children on lockdown, or even those back at school during these strange, unsettling times", she said.
The author said she originally intended to release it after the seventh and final ‘Harry Potter’ novel came out in 2007.
But she decided to take a break from publishing, and put the manuscript in her attic.
"Over time I came to think of it as a story that belonged to my two younger children, because I'd read it to them in the evenings when they were little, which has always been a happy family memory," she wrote on her website.