diff --git a/Realm+JSON/RLMObject+JSON.h b/Realm+JSON/RLMObject+JSON.h
index bbc05a2..6140910 100644
--- a/Realm+JSON/RLMObject+JSON.h
+++ b/Realm+JSON/RLMObject+JSON.h
@@ -10,6 +10,11 @@
 #import "MCJSONDateTransformer.h"
 #import "MCJSONValueTransformer.h"
 
+typedef NS_ENUM(NSUInteger, RLMPropertyMapping) {
+  RLMPropertyMappingCamelToSnakeCase = 0,
+  RLMPropertyMappingAsIs
+};
+
 @interface RLMObject (JSON)
 
 + (NSArray *)createOrUpdateInRealm:(RLMRealm *)realm withJSONArray:(NSArray *)array;
@@ -25,6 +30,9 @@
 - (void)performInTransaction:(void (^)())transaction;
 - (void)removeFromRealm;
 
++ (NSDictionary *)defaultInboundMappingForType:(RLMPropertyMapping)mappingType;
++ (NSDictionary *)defaultOutboundMappingForType:(RLMPropertyMapping)mappingType;
+
 @end
 
 @interface RLMArray (JSON)
diff --git a/Realm+JSON/RLMObject+JSON.m b/Realm+JSON/RLMObject+JSON.m
index 6f00f56..cb6411c 100644
--- a/Realm+JSON/RLMObject+JSON.m
+++ b/Realm+JSON/RLMObject+JSON.m
@@ -57,6 +57,7 @@ + (RLMObjectSchema *)sharedSchema;
 @implementation RLMObject (JSON)
 
 static NSInteger const kCreateBatchSize = 100;
+//static
 
 + (NSArray *)createOrUpdateInRealm:(RLMRealm *)realm withJSONArray:(NSArray *)array {
     NSInteger count = array.count;
@@ -165,7 +166,7 @@ + (id)mc_createObjectFromJSONDictionary:(NSDictionary *)dictionary {
 
 		id value = [dictionary valueForKeyPath:dictionaryKeyPath];
 
-		if (value) {
+    if (value && ![value isKindOfClass:[NSNull class]]) {
 			Class propertyClass = [[self class] mc_classForPropertyKey:objectKeyPath];
 
 			NSValueTransformer *transformer = [[self class] mc_transformerForPropertyKey:objectKeyPath];
@@ -260,26 +261,32 @@ - (id)mc_createJSONDictionary {
 
 #pragma mark - Properties
 
-+ (NSDictionary *)mc_defaultInboundMapping {
-    RLMObjectSchema *schema = [self sharedSchema];
-
-	NSMutableDictionary *result = [NSMutableDictionary dictionary];
-    for (RLMProperty *property in schema.properties) {
-        result[[property.name camelToSnakeCase]] = property.name;
++ (NSDictionary *)defaultInboundMappingForType:(RLMPropertyMapping)mappingType {
+  RLMObjectSchema *schema = [self sharedSchema];
 
+  NSMutableDictionary *result = [NSMutableDictionary dictionary];
+  for (RLMProperty *property in schema.properties) {
+    if (mappingType == RLMPropertyMappingCamelToSnakeCase) {
+      result[[property.name camelToSnakeCase]] = property.name;
+    } else {
+      result[property.name] = property.name;
     }
+  }
 
 	return [result copy];
 }
 
-+ (NSDictionary *)mc_defaultOutboundMapping {
-    RLMObjectSchema *schema = [self sharedSchema];
-
-    NSMutableDictionary *result = [NSMutableDictionary dictionary];
-    for (RLMProperty *property in schema.properties) {
-        result[property.name] = [property.name camelToSnakeCase];
++ (NSDictionary *)defaultOutboundMappingForType:(RLMPropertyMapping)mappingType {
+  RLMObjectSchema *schema = [self sharedSchema];
 
+  NSMutableDictionary *result = [NSMutableDictionary dictionary];
+  for (RLMProperty *property in schema.properties) {
+    if (mappingType == RLMPropertyMappingCamelToSnakeCase) {
+      result[[property.name camelToSnakeCase]] = property.name;
+    } else {
+      result[property.name] = property.name;
     }
+  }
 
 	return [result copy];
 }
@@ -299,7 +306,7 @@ + (NSDictionary *)mc_inboundMapping {
 			mapping = MCValueFromInvocation(self, selector);
 		}
 		else {
-			mapping = [self mc_defaultInboundMapping];
+			mapping = [self defaultInboundMappingForType:RLMPropertyMappingCamelToSnakeCase];
 		}
 		mappingForClassName[[self className]] = mapping;
 	}
@@ -319,7 +326,7 @@ + (NSDictionary *)mc_outboundMapping {
 			mapping = MCValueFromInvocation(self, selector);
 		}
 		else {
-			mapping = [self mc_defaultOutboundMapping];
+			mapping = [self defaultOutboundMappingForType:RLMPropertyMappingCamelToSnakeCase];
 		}
 		mappingForClassName[[self className]] = mapping;
 	}