diff --git a/example/ex01/generated/ex01_apidir.ts b/example/ex01/generated/ex01_apidir.ts
index 49b4080..2ecc821 100644
--- a/example/ex01/generated/ex01_apidir.ts
+++ b/example/ex01/generated/ex01_apidir.ts
@@ -6,14 +6,14 @@ export const Ex01InvpInfo = {
     name: "get-any-student",
     method: "GET",
     urlpath: "/student/any-one",
-    resp_type: undefined as unknown as Student,
+    responseType: undefined as unknown as Student,
   },
   "get-student-from-person": {
     name: "get-student-from-person",
     method: "POST",
     urlpath: "/student/from-person",
-    req_type: undefined as unknown as Person,
-    resp_type: undefined as unknown as Student | string,
+    requestType: undefined as unknown as Person,
+    responseType: undefined as unknown as Student | string,
   },
 } as const;
 export type Ex01InvpInfoMap = bindoj.IsApiDirInfoMap<typeof Ex01InvpInfo>;
diff --git a/example/ex02/generated/ex02_apidir.ts b/example/ex02/generated/ex02_apidir.ts
index f153ce7..4611425 100644
--- a/example/ex02/generated/ex02_apidir.ts
+++ b/example/ex02/generated/ex02_apidir.ts
@@ -6,57 +6,57 @@ export const Ex02InvpInfo = {
     name: "get-products",
     method: "POST",
     urlpath: "/products/get",
-    req_type: undefined as unknown as ProductQuery,
-    resp_type: undefined as unknown as Product[],
+    requestType: undefined as unknown as ProductQuery,
+    responseType: undefined as unknown as Product[],
   },
   "get-orders": {
     name: "get-orders",
     method: "POST",
     urlpath: "/orders/get",
-    req_type: undefined as unknown as OrderQuery,
-    resp_type: undefined as unknown as Order[],
+    requestType: undefined as unknown as OrderQuery,
+    responseType: undefined as unknown as Order[],
   },
   "get-product": {
     name: "get-product",
     method: "POST",
     urlpath: "/product/get",
-    req_type: undefined as unknown as ProductId,
-    resp_type: undefined as unknown as Product | string,
+    requestType: undefined as unknown as ProductId,
+    responseType: undefined as unknown as Product | string,
   },
   "get-order": {
     name: "get-order",
     method: "POST",
     urlpath: "/order/get",
-    req_type: undefined as unknown as OrderId,
-    resp_type: undefined as unknown as Order | string,
+    requestType: undefined as unknown as OrderId,
+    responseType: undefined as unknown as Order | string,
   },
   "register-product": {
     name: "register-product",
     method: "POST",
     urlpath: "/product/register",
-    req_type: undefined as unknown as ProductDetails,
-    resp_type: undefined as unknown as ProductId,
+    requestType: undefined as unknown as ProductDetails,
+    responseType: undefined as unknown as ProductId,
   },
   "register-order": {
     name: "register-order",
     method: "POST",
     urlpath: "/order/register",
-    req_type: undefined as unknown as OrderDetails,
-    resp_type: undefined as unknown as OrderId | string | string,
+    requestType: undefined as unknown as OrderDetails,
+    responseType: undefined as unknown as OrderId | string | string,
   },
   "update-product-details": {
     name: "update-product-details",
     method: "POST",
     urlpath: "/product/details/update",
-    req_type: undefined as unknown as { _0: ProductId; _1: ProductDetails },
-    resp_type: undefined as unknown as OrderId | string,
+    requestType: undefined as unknown as { _0: ProductId; _1: ProductDetails },
+    responseType: undefined as unknown as OrderId | string,
   },
   "update-order-status": {
     name: "update-order-status",
     method: "POST",
     urlpath: "/order/status/update",
-    req_type: undefined as unknown as { _0: OrderId; _1: "Unpaid" | "Paid" | "Shipped" | "Delivered" | "Canceled" },
-    resp_type: undefined as unknown as OrderId | string,
+    requestType: undefined as unknown as { _0: OrderId; _1: "Unpaid" | "Paid" | "Shipped" | "Delivered" | "Canceled" },
+    responseType: undefined as unknown as OrderId | string,
   },
 } as const;
 export type Ex02InvpInfoMap = bindoj.IsApiDirInfoMap<typeof Ex02InvpInfo>;
diff --git a/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_01.ts b/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_01.ts
index 77a9c47..e367587 100644
--- a/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_01.ts
+++ b/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_01.ts
@@ -7,14 +7,14 @@ export const Sample_apidir_01InvpInfo = {
     name: "get-any-student",
     method: "GET",
     urlpath: "/student/any-one",
-    resp_type: undefined as unknown as Student,
+    responseType: undefined as unknown as Student,
   },
   "get-student-from-person": {
     name: "get-student-from-person",
     method: "POST",
     urlpath: "/student/from-person",
-    req_type: undefined as unknown as Person,
-    resp_type: undefined as unknown as Student,
+    requestType: undefined as unknown as Person,
+    responseType: undefined as unknown as Student,
   },
 } as const;
 export type Sample_apidir_01InvpInfoMap = bindoj.IsApiDirInfoMap<typeof Sample_apidir_01InvpInfo>;
diff --git a/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_01_no_mangling.ts b/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_01_no_mangling.ts
index 8563ead..79239ce 100644
--- a/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_01_no_mangling.ts
+++ b/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_01_no_mangling.ts
@@ -7,14 +7,14 @@ export const Sample_apidir_01_no_manglingInvpInfo = {
     name: "get-any-student",
     method: "GET",
     urlpath: "/student/any-one",
-    resp_type: undefined as unknown as Student,
+    responseType: undefined as unknown as Student,
   },
   "get-student-from-person": {
     name: "get-student-from-person",
     method: "POST",
     urlpath: "/student/from-person",
-    req_type: undefined as unknown as person_no_mangling,
-    resp_type: undefined as unknown as Student,
+    requestType: undefined as unknown as person_no_mangling,
+    responseType: undefined as unknown as Student,
   },
 } as const;
 export type Sample_apidir_01_no_manglingInvpInfoMap = bindoj.IsApiDirInfoMap<
diff --git a/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_02.ts b/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_02.ts
index f56ff9d..44c51c7 100644
--- a/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_02.ts
+++ b/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_02.ts
@@ -6,21 +6,21 @@ export const Sample_apidir_02InvpInfo = {
     name: "get-any-int-list",
     method: "GET",
     urlpath: "/int-list/any-one",
-    resp_type: undefined as unknown as IntListObjtuple,
+    responseType: undefined as unknown as IntListObjtuple,
   },
   "inc-int-list": {
     name: "inc-int-list",
     method: "POST",
     urlpath: "/int-list/inc",
-    req_type: undefined as unknown as IntListObjtuple,
-    resp_type: undefined as unknown as IntListObjtuple,
+    requestType: undefined as unknown as IntListObjtuple,
+    responseType: undefined as unknown as IntListObjtuple,
   },
   "sum-of-int-list": {
     name: "sum-of-int-list",
     method: "POST",
     urlpath: "/int-list/sum",
-    req_type: undefined as unknown as IntListObjtuple,
-    resp_type: undefined as unknown as Int,
+    requestType: undefined as unknown as IntListObjtuple,
+    responseType: undefined as unknown as Int,
   },
 } as const;
 export type Sample_apidir_02InvpInfoMap = bindoj.IsApiDirInfoMap<typeof Sample_apidir_02InvpInfo>;
diff --git a/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_03.ts b/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_03.ts
index c256257..f52fdba 100644
--- a/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_03.ts
+++ b/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_03.ts
@@ -6,8 +6,8 @@ export const Sample_apidir_03InvpInfo = {
     name: "id-of-person",
     method: "POST",
     urlpath: "/person/id",
-    req_type: undefined as unknown as Person,
-    resp_type: undefined as unknown as Int | String,
+    requestType: undefined as unknown as Person,
+    responseType: undefined as unknown as Int | String,
   },
 } as const;
 export type Sample_apidir_03InvpInfoMap = bindoj.IsApiDirInfoMap<typeof Sample_apidir_03InvpInfo>;
diff --git a/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_04.ts b/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_04.ts
index d125689..97b69aa 100644
--- a/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_04.ts
+++ b/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_04.ts
@@ -6,15 +6,15 @@ export const Sample_apidir_04InvpInfo = {
     name: "name-of-named_json",
     method: "POST",
     urlpath: "/named_json/name",
-    req_type: undefined as unknown as NamedJson,
-    resp_type: undefined as unknown as String,
+    requestType: undefined as unknown as NamedJson,
+    responseType: undefined as unknown as String,
   },
   "json-of-named_json": {
     name: "json-of-named_json",
     method: "POST",
     urlpath: "/named_json/json",
-    req_type: undefined as unknown as NamedJson,
-    resp_type: undefined as unknown as any,
+    requestType: undefined as unknown as NamedJson,
+    responseType: undefined as unknown as any,
   },
 } as const;
 export type Sample_apidir_04InvpInfoMap = bindoj.IsApiDirInfoMap<typeof Sample_apidir_04InvpInfo>;
diff --git a/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_05.ts b/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_05.ts
index b8e7be1..7c97792 100644
--- a/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_05.ts
+++ b/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_05.ts
@@ -6,15 +6,15 @@ export const Sample_apidir_05InvpInfo = {
     name: "int-of-string",
     method: "POST",
     urlpath: "/option/int-of-string",
-    req_type: undefined as unknown as String,
-    resp_type: undefined as unknown as number | null | undefined,
+    requestType: undefined as unknown as String,
+    responseType: undefined as unknown as number | null | undefined,
   },
   "option-of-complex": {
     name: "option-of-complex",
     method: "POST",
     urlpath: "/option/of-complex",
-    req_type: undefined as unknown as ComplexTypesNotuple,
-    resp_type: undefined as unknown as number | null | undefined,
+    requestType: undefined as unknown as ComplexTypesNotuple,
+    responseType: undefined as unknown as number | null | undefined,
   },
 } as const;
 export type Sample_apidir_05InvpInfoMap = bindoj.IsApiDirInfoMap<typeof Sample_apidir_05InvpInfo>;
diff --git a/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_06.ts b/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_06.ts
index ed2c9a5..83912a4 100644
--- a/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_06.ts
+++ b/example/for_dev/apidir_examples/typescript-metainfo/sample_apidir_06.ts
@@ -6,15 +6,15 @@ export const Sample_apidir_06InvpInfo = {
     name: "get-x",
     method: "POST",
     urlpath: "/xy-opt/x",
-    req_type: undefined as unknown as XyOpt,
-    resp_type: undefined as unknown as number | null | undefined,
+    requestType: undefined as unknown as XyOpt,
+    responseType: undefined as unknown as number | null | undefined,
   },
   "get-y": {
     name: "get-y",
     method: "POST",
     urlpath: "/xy-opt/y",
-    req_type: undefined as unknown as XyOpt,
-    resp_type: undefined as unknown as number | null | undefined,
+    requestType: undefined as unknown as XyOpt,
+    responseType: undefined as unknown as number | null | undefined,
   },
 } as const;
 export type Sample_apidir_06InvpInfoMap = bindoj.IsApiDirInfoMap<typeof Sample_apidir_06InvpInfo>;
diff --git a/src/lib_apidir_typescript/bindoj_apidir_typescript.ml b/src/lib_apidir_typescript/bindoj_apidir_typescript.ml
index 4a744f3..b7afda6 100644
--- a/src/lib_apidir_typescript/bindoj_apidir_typescript.ml
+++ b/src/lib_apidir_typescript/bindoj_apidir_typescript.ml
@@ -123,7 +123,7 @@ let gen_raw :
       let endp_urlpath = invp.ip_urlpath |> litstr in
       let endp_method = litstr @@ match invp.ip_method with
         | `get -> "GET" | `post -> "POST" in
-      let resp_type_entry = "resp_type", typescript_resptypes invp' |> type_designator in
+      let resp_type_entry = "responseType", typescript_resptypes invp' |> type_designator in
       endp_name,
       objexpr ([
           "name", litstr endp_name;
@@ -136,7 +136,7 @@ let gen_raw :
                    ]
               | `post ->
                  Fn.flip List.append [
-                     "req_type", typescript_reqtype invp' |> type_designator;
+                     "requestType", typescript_reqtype invp' |> type_designator;
                      resp_type_entry;
                    ]
         ))
diff --git a/with_js/apidir-typescript-tests/tests/lib.ts b/with_js/apidir-typescript-tests/tests/lib.ts
index 23d552b..63e28b7 100644
--- a/with_js/apidir-typescript-tests/tests/lib.ts
+++ b/with_js/apidir-typescript-tests/tests/lib.ts
@@ -11,11 +11,11 @@ export const createMockClient =
     const res: { [prop: string]: any } = {};
     for (const [k, v] of Object.entries(invpInfo)) {
       if (v.method === "GET") {
-        res[k] = (): Promise<{body: typeof v.resp_type, status_code: number}> => {
+        res[k] = (): Promise<{ body: typeof v.responseType; status_code: number }> => {
           return mockServer.handle_path_json_get(v.urlpath);
         };
       } else {
-        res[k] = (reqBody: typeof v): Promise<{body: typeof v.resp_type, status_code: number}> => {
+        res[k] = (reqBody: typeof v): Promise<{ body: typeof v.responseType; status_code: number }> => {
           return mockServer.handle_path_json_post(v.urlpath, reqBody);
         };
       }
diff --git a/with_js/public-packages/runtime/src/apidir-types.ts b/with_js/public-packages/runtime/src/apidir-types.ts
index 679cad0..155a4f7 100644
--- a/with_js/public-packages/runtime/src/apidir-types.ts
+++ b/with_js/public-packages/runtime/src/apidir-types.ts
@@ -1,19 +1,19 @@
-export type ApiDirGetInvpInfo = {
+export type ApiDirGetInvpInfo<Req> = {
   name: string;
   urlpath: string;
-  resp_type: unknown;
+  responseType: Req;
   method: "GET";
 };
-export type ApiDirPostInvpInfo = {
+export type ApiDirPostInvpInfo<Req, Resp> = {
   name: string;
   urlpath: string;
-  req_type: unknown;
-  resp_type: unknown;
+  requestType: Req;
+  responseType: Resp;
   method: "POST";
 };
 
 export type ApiDirInfoMap = {
-  [invp: string]: ApiDirGetInvpInfo | ApiDirPostInvpInfo;
+  [invp: string]: ApiDirGetInvpInfo<unknown> | ApiDirPostInvpInfo<unknown, unknown>;
 };
 
 export type IsApiDirInfoMap<Dir extends ApiDirInfoMap> = Dir;
@@ -23,9 +23,9 @@ export type ApiDirAllInvps<InfoMap> = keyof InfoMap;
 export type ApiDirInvpRequestType<
   Dir extends ApiDirInfoMap,
   invp extends keyof Dir
-> = Dir[invp] extends ApiDirPostInvpInfo ? Dir[invp]["req_type"] : undefined;
+> = Dir[invp] extends ApiDirPostInvpInfo<unknown, unknown> ? Dir[invp]["requestType"] : undefined;
 
-export type ApiDirInvpResponseType<Dir extends ApiDirInfoMap, invp extends keyof Dir> = Dir[invp]["resp_type"];
+export type ApiDirInvpResponseType<Dir extends ApiDirInfoMap, invp extends keyof Dir> = Dir[invp]["responseType"];
 
 export type ApiDirInvpFunctionType<
   Dir extends ApiDirInfoMap,