diff --git a/taiga/projects/tagging/api.py b/taiga/projects/tagging/api.py
index c2dbd38a..db57b946 100644
--- a/taiga/projects/tagging/api.py
+++ b/taiga/projects/tagging/api.py
@@ -21,7 +21,7 @@ from taiga.base.decorators import detail_route
 from taiga.base.utils.collections import OrderedSet
 
 from . import services
-from . import serializers
+from . import validators
 
 
 class TagsColorsResourceMixin:
@@ -38,27 +38,26 @@ class TagsColorsResourceMixin:
         self.check_permissions(request, "create_tag", project)
         self._raise_if_blocked(project)
 
-        serializer = serializers.CreateTagSerializer(data=request.DATA, project=project)
-        if not serializer.is_valid():
-            return response.BadRequest(serializer.errors)
+        validator = validators.CreateTagValidator(data=request.DATA, project=project)
+        if not validator.is_valid():
+            return response.BadRequest(validator.errors)
 
-        data = serializer.data
+        data = validator.data
         services.create_tag(project, data.get("tag"), data.get("color"))
 
         return response.Ok()
 
-
     @detail_route(methods=["POST"])
     def edit_tag(self, request, pk=None):
         project = self.get_object()
         self.check_permissions(request, "edit_tag", project)
         self._raise_if_blocked(project)
 
-        serializer = serializers.EditTagTagSerializer(data=request.DATA, project=project)
-        if not serializer.is_valid():
-            return response.BadRequest(serializer.errors)
+        validator = validators.EditTagTagValidator(data=request.DATA, project=project)
+        if not validator.is_valid():
+            return response.BadRequest(validator.errors)
 
-        data = serializer.data
+        data = validator.data
         services.edit_tag(project,
                           data.get("from_tag"),
                           to_tag=data.get("to_tag", None),
@@ -66,18 +65,17 @@ class TagsColorsResourceMixin:
 
         return response.Ok()
 
-
     @detail_route(methods=["POST"])
     def delete_tag(self, request, pk=None):
         project = self.get_object()
         self.check_permissions(request, "delete_tag", project)
         self._raise_if_blocked(project)
 
-        serializer = serializers.DeleteTagSerializer(data=request.DATA, project=project)
-        if not serializer.is_valid():
-            return response.BadRequest(serializer.errors)
+        validator = validators.DeleteTagValidator(data=request.DATA, project=project)
+        if not validator.is_valid():
+            return response.BadRequest(validator.errors)
 
-        data = serializer.data
+        data = validator.data
         services.delete_tag(project, data.get("tag"))
 
         return response.Ok()
@@ -88,11 +86,11 @@ class TagsColorsResourceMixin:
         self.check_permissions(request, "mix_tags", project)
         self._raise_if_blocked(project)
 
-        serializer = serializers.MixTagsSerializer(data=request.DATA, project=project)
-        if not serializer.is_valid():
-            return response.BadRequest(serializer.errors)
+        validator = validators.MixTagsValidator(data=request.DATA, project=project)
+        if not validator.is_valid():
+            return response.BadRequest(validator.errors)
 
-        data = serializer.data
+        data = validator.data
         services.mix_tags(project, data.get("from_tags"), data.get("to_tag"))
 
         return response.Ok()
diff --git a/taiga/projects/tagging/serializers.py b/taiga/projects/tagging/validators.py
similarity index 77%
rename from taiga/projects/tagging/serializers.py
rename to taiga/projects/tagging/validators.py
index dc25b73a..595a5a3f 100644
--- a/taiga/projects/tagging/serializers.py
+++ b/taiga/projects/tagging/validators.py
@@ -19,6 +19,7 @@
 from django.utils.translation import ugettext as _
 
 from taiga.base.api import serializers
+from taiga.base.api import validators
 
 from . import services
 from . import fields
@@ -26,7 +27,7 @@ from . import fields
 import re
 
 
-class ProjectTagSerializer(serializers.Serializer):
+class ProjectTagValidator(validators.Validator):
     def __init__(self, *args, **kwargs):
         # Don't pass the extra project arg
         self.project = kwargs.pop("project")
@@ -35,26 +36,26 @@ class ProjectTagSerializer(serializers.Serializer):
         super().__init__(*args, **kwargs)
 
 
-class CreateTagSerializer(ProjectTagSerializer):
+class CreateTagValidator(ProjectTagValidator):
     tag = serializers.CharField()
     color = serializers.CharField(required=False)
 
     def validate_tag(self, attrs, source):
         tag = attrs.get(source, None)
         if services.tag_exist_for_project_elements(self.project, tag):
-            raise serializers.ValidationError(_("The tag exists."))
+            raise validators.ValidationError(_("The tag exists."))
 
         return attrs
 
     def validate_color(self, attrs, source):
         color = attrs.get(source, None)
         if not re.match('^\#([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$', color):
-            raise serializers.ValidationError(_("The color is not a valid HEX color."))
+            raise validators.ValidationError(_("The color is not a valid HEX color."))
 
         return attrs
 
 
-class EditTagTagSerializer(ProjectTagSerializer):
+class EditTagTagValidator(ProjectTagValidator):
     from_tag = serializers.CharField()
     to_tag = serializers.CharField(required=False)
     color = serializers.CharField(required=False)
@@ -62,37 +63,37 @@ class EditTagTagSerializer(ProjectTagSerializer):
     def validate_from_tag(self, attrs, source):
         tag = attrs.get(source, None)
         if not services.tag_exist_for_project_elements(self.project, tag):
-            raise serializers.ValidationError(_("The tag doesn't exist."))
+            raise validators.ValidationError(_("The tag doesn't exist."))
 
         return attrs
 
     def validate_to_tag(self, attrs, source):
         tag = attrs.get(source, None)
         if services.tag_exist_for_project_elements(self.project, tag):
-            raise serializers.ValidationError(_("The tag exists yet"))
+            raise validators.ValidationError(_("The tag exists yet"))
 
         return attrs
 
     def validate_color(self, attrs, source):
         color = attrs.get(source, None)
         if not re.match('^\#([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$', color):
-            raise serializers.ValidationError(_("The color is not a valid HEX color."))
+            raise validators.ValidationError(_("The color is not a valid HEX color."))
 
         return attrs
 
 
-class DeleteTagSerializer(ProjectTagSerializer):
+class DeleteTagValidator(ProjectTagValidator):
     tag = serializers.CharField()
 
     def validate_tag(self, attrs, source):
         tag = attrs.get(source, None)
         if not services.tag_exist_for_project_elements(self.project, tag):
-            raise serializers.ValidationError(_("The tag doesn't exist."))
+            raise validators.ValidationError(_("The tag doesn't exist."))
 
         return attrs
 
 
-class MixTagsSerializer(ProjectTagSerializer):
+class MixTagsValidator(ProjectTagValidator):
     from_tags = fields.TagsField()
     to_tag = serializers.CharField()
 
@@ -100,13 +101,13 @@ class MixTagsSerializer(ProjectTagSerializer):
         tags = attrs.get(source, None)
         for tag in tags:
             if not services.tag_exist_for_project_elements(self.project, tag):
-                raise serializers.ValidationError(_("The tag doesn't exist."))
+                raise validators.ValidationError(_("The tag doesn't exist."))
 
         return attrs
 
     def validate_to_tag(self, attrs, source):
         tag = attrs.get(source, None)
         if not services.tag_exist_for_project_elements(self.project, tag):
-            raise serializers.ValidationError(_("The tag doesn't exist."))
+            raise validators.ValidationError(_("The tag doesn't exist."))
 
         return attrs