Janel Parrish made her debut in the American action drama television series ‘Baywatch’ in 1999. She starred in 2 episodes of the series. Following her debut, Parrish went on to appear in television films and series like ‘Geppetto’ (2000), ‘Star Search’ (2003), ‘The Bernie Mac Show’ (2004), ‘Zoey 101’ (2006), and ‘The O.C.’ (2006). In 2007, she made her big-screen debut in the American comedy film ‘Bratz’ directed by Sean McNamara. The film was panned by critics and was a box office bomb. That same year, she also became a part of the American superhero drama television series ‘Heroes’ where she played the role of ‘May.’ The show aired its final episode in 2010. In 2009, she starred as ‘Lana’ in the American teen sex comedy film ‘Fired Up!’ directed by Will Gluck. The film saw negative reviews upon release and was a commercial failure. In 2010, she joined the cast of the American teen drama mystery-thriller television series ‘Pretty Little Liars.’ She played the role of ‘Mona Vanderwaal’ and remained a part of the show until it went off-air in 2017. Parrish also received 4 ‘Teen Choice Awards’ for her performance in the series.Â
She next appeared in television series like ‘Hawaii Five-0’ (2013), ‘Drop Dead Diva’ (2014), ‘Dancing with the Stars’ (2014), and ‘The Mysteries of Laura’ (2015). In 2018, she starred as ‘Margot Covey’ in the American teen romantic comedy film ‘To All the Boys I've Loved Before’ directed by Susan Johnson. The film was widely praised by critics. Parrish reprised her role as ‘Margot Covey’ in ‘To All the Boys: P.S. I Still Love You’ (2020) and ‘To All the Boys: Always and Forever’ (2021). In 2019, she returned to play ‘Mona Vanderwaal’ in ‘Pretty Little Liars: The Perfectionists,’ the sequel to the crime thriller mystery drama television series ‘Pretty Little Liars.’ The series was canceled after one season. Parrish was last seen in the 2021 television film ‘Coyote Creek Christmas’ where she played the role of ‘Paige Parker.’