diff --git a/InvenTree/part/urls.py b/InvenTree/part/urls.py
index e7b1004ec5..bb7595a271 100644
--- a/InvenTree/part/urls.py
+++ b/InvenTree/part/urls.py
@@ -18,22 +18,18 @@ categorypatterns = [
 
 partparampatterns = [
     # Detail of a single part parameter
-    url(r'^(?P<pk>[0-9]+)/$', views.PartParamDetail.as_view()),
+    url(r'^(?P<pk>[0-9]+)/?$', views.PartParamDetail.as_view()),
 
     # Parameters associated with a particular part
-    url(r'^\?[^/]*/$', views.PartParamList.as_view()),
-
-    # All part parameters
-    url(r'^$', views.PartParamList.as_view()),
+    url(r'^\?*[^/]*/?$', views.PartParamList.as_view()),
 ]
 
 parttemplatepatterns = [
     # Detail of a single part field template
-    url(r'^(?P<pk>[0-9]+)/$', views.PartTemplateDetail.as_view()),
+    url(r'^(?P<pk>[0-9]+)/?$', views.PartTemplateDetail.as_view()),
 
     # List all part field templates
     url(r'^$', views.PartTemplateList.as_view())
-
 ]
 
 """ Top-level URL patterns for the Part app:
@@ -44,7 +40,7 @@ parttemplatepatterns = [
 """
 urlpatterns = [
     # Individual part
-    url(r'^(?P<pk>[0-9]+)/$', views.PartDetail.as_view()),
+    url(r'^(?P<pk>[0-9]+)/?$', views.PartDetail.as_view()),
 
     # Part categories
     url(r'^category/?', include(categorypatterns)),
diff --git a/InvenTree/part/views.py b/InvenTree/part/views.py
index 9ad987d2fb..711df899f8 100644
--- a/InvenTree/part/views.py
+++ b/InvenTree/part/views.py
@@ -69,8 +69,10 @@ class PartList(generics.ListCreateAPIView):
 
     def get_queryset(self):
         parts = Part.objects.all()
+        params = self.request.query_params
+
+        cat_id = params.get('category', None)
 
-        cat_id = self.request.query_params.get('category', None)
         if cat_id:
             parts = parts.filter(category=cat_id)
 
diff --git a/InvenTree/project/serializers.py b/InvenTree/project/serializers.py
index dd9c9cb784..00c70fed18 100644
--- a/InvenTree/project/serializers.py
+++ b/InvenTree/project/serializers.py
@@ -35,16 +35,10 @@ class ProjectCategoryBriefSerializer(serializers.ModelSerializer):
 
 class ProjectCategoryDetailSerializer(serializers.ModelSerializer):
 
-    projects = ProjectSerializer(many=True, read_only=True)
-
-    children = ProjectCategoryBriefSerializer(many=True, read_only=True)
-
     class Meta:
         model = ProjectCategory
         fields = ('pk',
                   'name',
                   'description',
                   'parent',
-                  'path',
-                  'children',
-                  'projects')
+                  'path')
diff --git a/InvenTree/project/urls.py b/InvenTree/project/urls.py
index 27c7ab2f0b..27f7fed78b 100644
--- a/InvenTree/project/urls.py
+++ b/InvenTree/project/urls.py
@@ -13,34 +13,30 @@ projectdetailpatterns = [
 
 projectpartpatterns = [
     # Detail of a single project part
-    url(r'^(?P<pk>[0-9]+)/$', views.ProjectPartDetail.as_view()),
+    url(r'^(?P<pk>[0-9]+)/?$', views.ProjectPartDetail.as_view()),
 
     # List project parts, with optional filters
     url(r'^\?*[^/]*/?$', views.ProjectPartsList.as_view()),
 ]
 
 projectcategorypatterns = [
-    # List of top-level project categories
-    url(r'^$', views.ProjectCategoryList.as_view()),
-
     # Detail of a single project category
-    url(r'^(?P<pk>[0-9]+)/$', views.ProjectCategoryDetail.as_view()),
+    url(r'^(?P<pk>[0-9]+)/?$', views.ProjectCategoryDetail.as_view()),
 
-    # Create a new category
-    url(r'^new/$', views.NewProjectCategory.as_view())
+    # List of project categories, with filters
+    url(r'^\?*[^/]*/?$', views.ProjectCategoryList.as_view()),
 ]
 
 urlpatterns = [
-
     # Individual project URL
-    url(r'^(?P<pk>[0-9]+)/', include(projectdetailpatterns)),
+    url(r'^(?P<pk>[0-9]+)/?$', include(projectdetailpatterns)),
 
     # List of all projects
     url(r'^$', views.ProjectList.as_view()),
 
     # Project parts
-    url(r'^parts/', include(projectpartpatterns)),
+    url(r'^parts/?', include(projectpartpatterns)),
 
     # Project categories
-    url(r'^category/', include(projectcategorypatterns)),
+    url(r'^category/?', include(projectcategorypatterns)),
 ]
diff --git a/InvenTree/project/views.py b/InvenTree/project/views.py
index 923fff27fe..716cd19a79 100644
--- a/InvenTree/project/views.py
+++ b/InvenTree/project/views.py
@@ -1,5 +1,6 @@
 from rest_framework import generics, permissions
 
+from InvenTree.models import FilterChildren
 from .models import ProjectCategory, Project, ProjectPart
 from .serializers import ProjectSerializer
 from .serializers import ProjectCategoryDetailSerializer
@@ -16,21 +17,24 @@ class ProjectDetail(generics.RetrieveUpdateDestroyAPIView):
 
 
 class ProjectList(generics.ListCreateAPIView):
-    """ List all projects
+    """ List projects
     """
 
-    queryset = Project.objects.all()
+    def get_queryset(self):
+        projects = Project.objects.all()
+        params = self.request.query_params
+
+        cat_id = params.get('category', None)
+
+        if cat_id:
+            projects = projects.filter(category=cat_id)
+
+        return projects
+
     serializer_class = ProjectSerializer
     permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
 
 
-class NewProjectCategory(generics.CreateAPIView):
-    """ Create a new Project Category
-    """
-    serializer_class = ProjectCategoryDetailSerializer
-    permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
-
-
 class ProjectCategoryDetail(generics.RetrieveUpdateAPIView):
     """ Project details
     """
@@ -41,29 +45,42 @@ class ProjectCategoryDetail(generics.RetrieveUpdateAPIView):
 
 
 class ProjectCategoryList(generics.ListCreateAPIView):
-    """ Top-level project categories.
-    Projects are considered top-level if they do not have a parent
+    """ List project categories
     """
 
-    queryset = ProjectCategory.objects.filter(parent=None)
+    def get_queryset(self):
+        params = self.request.query_params
+
+        categories = ProjectCategory.objects.all()
+
+        categories = FilterChildren(categories, params.get('parent', None))
+
+        return categories
+
     serializer_class = ProjectCategoryDetailSerializer
     permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
 
 
 class ProjectPartsList(generics.ListCreateAPIView):
-    """ List all parts associated with a particular project
+    """ List project parts
     """
 
     serializer_class = ProjectPartSerializer
     permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
 
     def get_queryset(self):
-        project_id = self.request.query_params.get('project', None)
+        parts = ProjectPart.objects.all()
+        params = self.request.query_params
 
+        project_id = params.get('project', None)
         if project_id:
-            return ProjectPart.objects.filter(project=project_id)
-        else:
-            return ProjectPart.objects.all()
+            parts = parts.filter(project=project_id)
+
+        part_id = params.get('part', None)
+        if part_id:
+            parts = parts.filter(part=part_id)
+
+        return parts
 
     def create(self, request, *args, **kwargs):
         # Ensure project link is set correctly