In computer slang, J. Random Hacker is an arbitrary programmer (hacker).
"J. Random Hacker" is a popular placeholder name in a number of books and articles in programming.[1] [2] J. Random Hacker even authored a book about ease of malicious hacking, Adventures of a Wi-Fi Pirate.[3] Also, J. Random Hacker was a main developer of I2P software.
Over time, J. Random X has become a popular cliché or snowclone in computer lore, with more types of "random" (meaning "arbitrary") categories of people, such as "J. Random Newbie",[4] J. Random User,[5] or J. Random Luser.