A visa is required for all travelers entering Jordan.
Most nationalities can obtain the visa upon arrival at Amman airport at a cost of JOD 40. Note that cash payment is required. USD is accepted corresponding to the exchange rate at the time of entry. Kindly be advised that certain nationalities require an entry visa to be obtained PRIOR to travel. A list of these nationalities, as well as the most updated rules and regulations can be found on the Jordan Tourism Board's website.
It is solely each traveler's own responsibility to ensure they are in possession of the necessary documentation, and in compliance with the laws and regulations of the country visited.
Your passport must be valid for at least 6 months from the day of your departure.