The dress code is formal!
Yes!!
A passport valid for 6 months and 40 JOD (£44). If you're planning to visit tourist sites like Petra, Wadi Rum, or Jerash and stay at least 3 nights, consider getting the Jordan Pass, which bundles the visa fee with discounted/free entry to over 40 attractions. It can be purchased online or at the airport. If you don't want to do this, you can pay the visa fee at Queen Alia airport.
You are more than welcome to bring a plus-one, but please let me know if you plan on doing so!
We would recommend Uber!