gistfile1.txt

//-------- Client side
var my_array = ['a', 'b', 'c'];
$.get('/api/end_point', {arr: JSON.stringify(my_array)}, function(data) { //note that we stringify the array before sending it
  //we assume everything went well on the server
}, 'json');
 
 
 
#--------- Server side
class ArrayRequestHandler(webapp2.RequestHandler):
  def get(self):
    recipe = Recipe.some_function_to_get_recipe()
    recipe.steps = self.request.get('arr')   #note, we save JSON as string (as we got it form the client)
    recipe.put()