diff --git a/lib/jsonapi/processor.rb b/lib/jsonapi/processor.rb
index 242680308..b1c6dc3d8 100644
--- a/lib/jsonapi/processor.rb
+++ b/lib/jsonapi/processor.rb
@@ -68,13 +68,15 @@ def find
       include_directives = params[:include_directives]
       sort_criteria = params.fetch(:sort_criteria, [])
       paginator = params[:paginator]
+      fields = params[:fields]
 
       verified_filters = resource_klass.verify_filters(filters, context)
       resource_records = resource_klass.find(verified_filters,
                                              context: context,
                                              include_directives: include_directives,
                                              sort_criteria: sort_criteria,
-                                             paginator: paginator)
+                                             paginator: paginator,
+                                             fields: fields)
 
       page_options = {}
       if (JSONAPI.configuration.top_level_meta_include_record_count ||
@@ -97,13 +99,15 @@ def find
 
     def show
       include_directives = params[:include_directives]
+      fields = params[:fields]
       id = params[:id]
 
       key = resource_klass.verify_key(id, context)
 
       resource_record = resource_klass.find_by_key(key,
                                                    context: context,
-                                                   include_directives: include_directives)
+                                                   include_directives: include_directives,
+                                                   fields: fields)
 
       return JSONAPI::ResourceOperationResult.new(:ok, resource_record)
     end
@@ -123,8 +127,9 @@ def show_related_resource
       source_klass = params[:source_klass]
       source_id = params[:source_id]
       relationship_type = params[:relationship_type].to_sym
+      fields = params[:fields]
 
-      source_resource = source_klass.find_by_key(source_id, context: context)
+      source_resource = source_klass.find_by_key(source_id, context: context, fields: fields)
 
       related_resource = source_resource.public_send(relationship_type)
 
@@ -138,13 +143,15 @@ def show_related_resources
       filters = params[:filters]
       sort_criteria = params[:sort_criteria]
       paginator = params[:paginator]
+      fields = params[:fields]
 
-      source_resource ||= source_klass.find_by_key(source_id, context: context)
+      source_resource ||= source_klass.find_by_key(source_id, context: context, fields: fields)
 
       related_resources = source_resource.public_send(relationship_type,
                                                       filters:  filters,
                                                       sort_criteria: sort_criteria,
-                                                      paginator: paginator)
+                                                      paginator: paginator,
+                                                      fields: fields)
 
       if ((JSONAPI.configuration.top_level_meta_include_record_count) ||
           (paginator && paginator.class.requires_record_count) ||
@@ -182,7 +189,6 @@ def show_related_resources
 
     def create_resource
       data = params[:data]
-
       resource = resource_klass.create(context)
       result = resource.replace_fields(data)
 
diff --git a/lib/jsonapi/request_parser.rb b/lib/jsonapi/request_parser.rb
index f03208c90..1c2668bec 100644
--- a/lib/jsonapi/request_parser.rb
+++ b/lib/jsonapi/request_parser.rb
@@ -295,7 +295,8 @@ def add_find_operation
         filters: @filters,
         include_directives: @include_directives,
         sort_criteria: @sort_criteria,
-        paginator: @paginator
+        paginator: @paginator,
+        fields: @fields
       )
     end
 
@@ -304,7 +305,8 @@ def add_show_operation
         @resource_klass,
         context: @context,
         id: @id,
-        include_directives: @include_directives
+        include_directives: @include_directives,
+        fields: @fields
       )
     end
 
@@ -323,7 +325,8 @@ def add_show_related_resource_operation(relationship_type)
         context: @context,
         relationship_type: relationship_type,
         source_klass: @source_klass,
-        source_id: @source_id
+        source_id: @source_id,
+        fields: @fields
       )
     end
 
@@ -336,7 +339,8 @@ def add_show_related_resources_operation(relationship_type)
         source_id: @source_id,
         filters: @source_klass.verify_filters(@filters, @context),
         sort_criteria: @sort_criteria,
-        paginator: @paginator
+        paginator: @paginator,
+        fields: @fields
       )
     end
 
@@ -359,7 +363,8 @@ def parse_add_operation(data)
         @operations.push JSONAPI::Operation.new(:create_resource,
           @resource_klass,
           context: @context,
-          data: data
+          data: data,
+          fields: @fields
         )
       end
     rescue JSONAPI::Exceptions::Error => e
@@ -619,7 +624,8 @@ def parse_single_replace_operation(data, keys, id_key_presence_check_required: t
         @resource_klass,
         context: @context,
         resource_id: key,
-        data: parse_params(data, updatable_fields)
+        data: parse_params(data, updatable_fields),
+        fields: @fields
       )
     end