Question: is there going to be a season 4 shadowhunters

Answer: No, In April 2017, it was announced that the series had been renewed for a third season of 20 episodes. The first half of ten episodes premiered on March 20, 2018. In June 2018, Freeform canceled the series after three seasons, but ordered two extra episodes to properly conclude the series' story; the second half of the third season is set to air in early 2019. As of May 15, 2018, 43 episodes of Shadowhunters have aired, concluding the first half of the third season.