She also said there should be some updates to the site within a couple of weeks.
The site has been in development for some time. According to JK: "I told the designers that I wanted to use my real desk as the home page, with Portkeys to take people to the various sections, and we worked out all the details together.
"So I was very involved! The designers actually took a picture of my real desk to work from and the result is very accurate."
Potter fans always have lots of questions about the book. So JK had a very difficult task deciding what to answer.
She said: "I've chosen a few questions that I knew people really wanted answered, but which didn't get asked in the last Webchat I did for World Book Day.
"And I've also thrown in a few bits and pieces from my notebooks." She adds "There's more to come!"
But the big question for many fans is when will we find out what's behind the mysterious door.
JK's reply: "I told you on the site patience is the key."