I think BodyParser is a dependency 

https://github.com/fac-14/Brickworks-Tollington_Project/blob/5d777543b783dda90ab37da373dd7ebbce497850/package.json#L54

It's down as a devDependency - might cause issues with Heroku if it's not installing it for your live build (as you call it a few times in your Express setup) 