Before Jersey Shore, Farley owned a graphic design Business, Jenni Farley Designs, Inc. In December 2009, at the age of 23 years, Farley began appearing in Jersey Shore in which she and seven housemates spent the summer in Seaside Heights, New Jersey. The second season was filmed in Miami, Florida, and then the third season returned to New Jersey. A fourth season of the series was filmed in Florence, Italy, and the final two seasons moved back to Seaside Heights.
Farley launched a line, "Filthy Couture," in a Las Vegas, Nevada runway show in July 2010. After four months of operation, the line ceased sales in October 2010 due to a threatened trademark lawsuit. Farley stated that the brand was not over and a new line would be released. In April 2011, MTV announced that it ordered two Jersey Shore spin-off series, one of which will feature Farley and castmate Nicole Polizzi. Twelve episodes were ordered for the first season. In 2010 she released a book titled The Rules According to JWOWW: Shore-Tested Secrets On Landing A Mint Guy, Staying Fresh To Death, and Kicking the Competition to the Curb. In 2012, she was sued for allegedly filming several episodes of her reality show without proper authorization from her landlord.
In October 2011, JWOWW launched her official website
In 2012, Farley and her Jersey Shore costar, Nicole Polizzi began starring in Snooki & JWoww, which premiered on MTV on June 21, 2012. The first season was filmed over the course of six weeks at a former two-story firehouse located near Grove and Mercer Streets in Jersey City, New Jersey, followed Polizzi and Farley moving in together, and was described as a modern-day Laverne & Shirley. JWoww also hosted MTV's Club New Year's Eve 2013 with Polizzi and Jeff Dye to ring in 2013. The duo did star again in the second season of Snooki & JWoww, which followed the stars at their actual permanent residences, and premiered on January 8, 2013. It was renewed for a third season.
In January 2013, Farley ranked in GQ magazine's "Sexiest 100 Ladies of the 21st Century" list.
Farley and longtime boyfriend Roger Mathews got married in October 2015. They have two children.
