diff --git a/.changeset/odd-seahorses-juggle.md b/.changeset/odd-seahorses-juggle.md
new file mode 100644
index 000000000..dffb198f6
--- /dev/null
+++ b/.changeset/odd-seahorses-juggle.md
@@ -0,0 +1,5 @@
+---
+"openapi-typescript-helpers": patch
+---
+
+fix SuccessResponseJSON, ErrorResponseJSON and RequestBodyJSON helpers
diff --git a/packages/openapi-typescript-helpers/index.d.ts b/packages/openapi-typescript-helpers/index.d.ts
index d8e67c501..c6cf5cbd1 100644
--- a/packages/openapi-typescript-helpers/index.d.ts
+++ b/packages/openapi-typescript-helpers/index.d.ts
@@ -131,13 +131,13 @@ export type ErrorResponse<T, Media extends MediaType = MediaType> = FilterKeys<
 >;
 
 /** Return first JSON-like 2XX response from a path + HTTP method */
-export type SuccessResponseJSON<PathMethod> = SuccessResponse<ResponseObjectMap<PathMethod>>;
+export type SuccessResponseJSON<PathMethod> = SuccessResponse<ResponseObjectMap<PathMethod>, `${string}/json`>;
 
 /** Return first JSON-like 5XX or 4XX response from a path + HTTP method */
-export type ErrorResponseJSON<PathMethod> = ErrorResponse<ResponseObjectMap<PathMethod>>;
+export type ErrorResponseJSON<PathMethod> = ErrorResponse<ResponseObjectMap<PathMethod>, `${string}/json`>;
 
 /** Return JSON-like request body from a path + HTTP method */
-export type RequestBodyJSON<PathMethod> = FilterKeys<OperationRequestBody<PathMethod>, "content">;
+export type RequestBodyJSON<PathMethod> = JSONLike<FilterKeys<OperationRequestBody<PathMethod>, "content">>;
 
 // Generic TS utils