413 Request Entity Too Large in a mean stack application

I have built a mean-stack application. When I run it in localhost and save a big object into the database, I have got an error:

Failed to load resource: the server responded with a status of 413 (Request Entity Too Large)

Does anyone know where I should modify this setting?

Additionally, what I saved is an object containing a 2 x 3000 array, I don't think it is too big... does anyone have any trick to save such an array in a small size?

via SoftTimur