diff --git a/examples/express.ts b/examples/express.ts
index 9e6f7a0..7bc03d0 100644
--- a/examples/express.ts
+++ b/examples/express.ts
@@ -1,5 +1,5 @@
 import express from "express";
-import { asAsync, typed } from "../src";
+import { asAsync, typed } from "../src/express";
 import { pathMap } from "./spec";
 
 const newApp = () => {
@@ -9,7 +9,7 @@ const newApp = () => {
   // ```
   // // validatorMiddleware allows to use res.locals.validate method
   // app.use(validatorMiddleware(pathMap));
-  // // wApp is same as app, but with additional type information
+  // // wApp is same as app, but with additional common information
   // const wApp = app as TRouter<typeof pathMap>;
   // ```
   const wApp = asAsync(typed(pathMap, app));
diff --git a/examples/fetch.ts b/examples/fetch.ts
index c9df37e..a7635c2 100644
--- a/examples/fetch.ts
+++ b/examples/fetch.ts
@@ -1,12 +1,12 @@
 import { PathMap } from "./spec";
-import { TFetch } from "../src";
-import { JSON$stringifyT } from "../src/json";
+import { JSON$stringifyT } from "../src";
 import { unreachable } from "../src/utils";
+import FetchT from "../src/fetch";
 
-const fetchT = fetch as TFetch<typeof origin, PathMap>;
+const fetchT = fetch as FetchT<typeof origin, PathMap>;
 const origin = "http://localhost:3000";
 const headers = { "Content-Type": "application/json" };
-// stringify is same as JSON.stringify but with type information
+// stringify is same as JSON.stringify but with common information
 const stringify = JSON.stringify as JSON$stringifyT;
 
 const main = async () => {
@@ -34,7 +34,7 @@ const main = async () => {
 
   {
     // query parameter example
-    // TODO: Add type information for query parameter
+    // TODO: Add common information for query parameter
     const path = `${origin}/users?page=1`;
     const method = "get";
     const res = await fetchT(path, { method });
@@ -56,7 +56,7 @@ const main = async () => {
       method,
       headers,
       // body is the request schema defined in pathMap["/users"]["post"].body
-      // stringify is same as JSON.stringify but with type information
+      // stringify is same as JSON.stringify but with common information
       body: stringify({ userName: "user1" }),
     });
     if (res.ok) {
diff --git a/package.json b/package.json
index 43f9ad8..6de9191 100644
--- a/package.json
+++ b/package.json
@@ -43,10 +43,30 @@
       "import": "./dist/index.mjs",
       "types": "./dist/index.d.ts"
     },
+    "./common": {
+      "require": "./dist/common/index.js",
+      "import": "./dist/common/index.mjs",
+      "types": "./dist/common/index.d.ts"
+    },
     "./express": {
-      "require": "./dist/express.js",
-      "import": "./dist/express.mjs",
-      "types": "./dist/express.d.ts"
+      "require": "./dist/express/index.js",
+      "import": "./dist/express/index.mjs",
+      "types": "./dist/express/index.d.ts"
+    },
+    "./fetch": {
+      "require": "./dist/fetch/index.js",
+      "import": "./dist/fetch/index.mjs",
+      "types": "./dist/fetch/index.d.ts"
+    },
+    "./json": {
+      "require": "./dist/json/index.js",
+      "import": "./dist/json/index.mjs",
+      "types": "./dist/json/index.d.ts"
+    },
+    "./zod": {
+      "require": "./dist/zod/index.js",
+      "import": "./dist/zod/index.mjs",
+      "types": "./dist/zod/index.d.ts"
     }
   },
   "main": "./dist/index.js",
diff --git a/src/hono-types.ts b/src/common/hono-types.ts
similarity index 100%
rename from src/hono-types.ts
rename to src/common/hono-types.ts
diff --git a/src/common/index.ts b/src/common/index.ts
new file mode 100644
index 0000000..d43c7be
--- /dev/null
+++ b/src/common/index.ts
@@ -0,0 +1,5 @@
+export * from "./hono-types";
+export * from "./query-string";
+export * from "./spec";
+export * from "./type";
+export * from "./url";
diff --git a/src/query-string.ts b/src/common/query-string.ts
similarity index 100%
rename from src/query-string.ts
rename to src/common/query-string.ts
diff --git a/src/spec.test.ts b/src/common/spec.test.ts
similarity index 100%
rename from src/spec.test.ts
rename to src/common/spec.test.ts
diff --git a/src/spec.ts b/src/common/spec.ts
similarity index 83%
rename from src/spec.ts
rename to src/common/spec.ts
index 499dac2..be22bea 100644
--- a/src/spec.ts
+++ b/src/common/spec.ts
@@ -1,5 +1,5 @@
 import { z } from "zod";
-import { StatusCode } from "./hono-types";
+import { ClientResponse, StatusCode } from "./hono-types";
 import { ParseUrlParams } from "./url";
 
 export type ApiResponses = Partial<Record<StatusCode, z.ZodTypeAny>>;
@@ -68,3 +68,13 @@ export type Method = (typeof Method)[number];
 export type ApiEndpoints = {
   [K in string]: Partial<Record<Method, ApiSpec<ParseUrlParams<K>>>>;
 };
+
+type ApiClientResponses<AResponses extends ApiResponses> = {
+  [SC in keyof AResponses & StatusCode]: ClientResponse<
+    z.infer<ApiResSchema<AResponses, SC>>,
+    SC,
+    "json"
+  >;
+};
+export type MergeApiResponses<AR extends ApiResponses> =
+  ApiClientResponses<AR>[keyof ApiClientResponses<AR>];
diff --git a/src/type-test.ts b/src/common/type-test.ts
similarity index 100%
rename from src/type-test.ts
rename to src/common/type-test.ts
diff --git a/src/common/type.ts b/src/common/type.ts
new file mode 100644
index 0000000..6a6e372
--- /dev/null
+++ b/src/common/type.ts
@@ -0,0 +1,3 @@
+export type FilterNever<T extends Record<string, unknown>> = {
+  [K in keyof T as T[K] extends never ? never : K]: T[K];
+};
diff --git a/src/url.t-test.ts b/src/common/url.t-test.ts
similarity index 87%
rename from src/url.t-test.ts
rename to src/common/url.t-test.ts
index 849b2c3..7e87490 100644
--- a/src/url.t-test.ts
+++ b/src/common/url.t-test.ts
@@ -1,8 +1,5 @@
 import { Equal, Expect } from "./type-test";
-import { OriginPattern, ParseOrigin, ParseURL } from "./url";
-
-// eslint-disable-next-line @typescript-eslint/no-unused-vars
-const o: OriginPattern = "https://example.com";
+import { ParseOrigin, ParseURL } from "./url";
 
 // eslint-disable-next-line @typescript-eslint/no-unused-vars
 type cases = [
diff --git a/src/url.ts b/src/common/url.ts
similarity index 100%
rename from src/url.ts
rename to src/common/url.ts
diff --git a/src/express.ts b/src/express/index.ts
similarity index 82%
rename from src/express.ts
rename to src/express/index.ts
index c572299..44a1cd5 100644
--- a/src/express.ts
+++ b/src/express/index.ts
@@ -1,20 +1,26 @@
 import { IRouter, RequestHandler, Router } from "express";
-import { ApiEndpoints, ApiResponses, ApiResSchema, ApiSpec, Method } from "./";
-import { Validator, Validators } from "./validator";
+import {
+  ApiEndpoints,
+  ApiResponses,
+  ApiResSchema,
+  ApiSpec,
+  Method,
+} from "../index";
+import { ZodValidator, ZodValidators } from "../zod";
 import {
   NextFunction,
   ParamsDictionary,
   Request,
   Response,
 } from "express-serve-static-core";
-import { StatusCode } from "./hono-types";
+import { StatusCode } from "../common";
 import { z } from "zod";
-import { ParseUrlParams } from "./url";
+import { ParseUrlParams } from "../common";
 
-interface ParsedQs {
+export interface ParsedQs {
   [key: string]: undefined | string | string[] | ParsedQs | ParsedQs[];
 }
-type Handler<
+export type Handler<
   Spec extends ApiSpec | undefined,
   SC extends keyof NonNullable<ApiSpec>["res"] & StatusCode = 200,
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
@@ -26,7 +32,7 @@ type Handler<
   next: NextFunction,
 ) => void;
 
-type ExpressResponse<
+export type ExpressResponse<
   Responses extends ApiResponses,
   SC extends keyof Responses & StatusCode,
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
@@ -40,18 +46,18 @@ type ExpressResponse<
   ) => Response<z.infer<ApiResSchema<Responses, SC>>, LocalsObj, SC>;
 };
 
-type ValidateLocals<
+export type ValidateLocals<
   AS extends ApiSpec | undefined,
   QueryKeys extends string,
 > = AS extends ApiSpec
   ? {
       validate: (
         req: Request<ParamsDictionary, unknown, unknown, unknown>,
-      ) => Validators<AS, QueryKeys>;
+      ) => ZodValidators<AS, QueryKeys>;
     }
   : Record<string, never>;
 
-type TRouter<
+export type RouterT<
   Endpoints extends ApiEndpoints,
   SC extends StatusCode = StatusCode,
 > = Omit<IRouter, Method> & {
@@ -64,7 +70,7 @@ type TRouter<
         ValidateLocals<Endpoints[Path][M], ParseUrlParams<Path>>
       >
     >
-  ) => TRouter<Endpoints, SC>;
+  ) => RouterT<Endpoints, SC>;
 };
 
 const validatorMiddleware = (pathMap: ApiEndpoints) => {
@@ -78,7 +84,7 @@ const validatorMiddleware = (pathMap: ApiEndpoints) => {
 export const typed = <const Endpoints extends ApiEndpoints>(
   pathMap: Endpoints,
   router: Router,
-): TRouter<Endpoints> => {
+): RouterT<Endpoints> => {
   router.use(validatorMiddleware(pathMap));
   return router;
 };
@@ -92,21 +98,21 @@ export const newValidator = <E extends ApiEndpoints>(endpoints: E) => {
     return {
       params: () =>
         spec?.params?.safeParse(req.params) as E[Path][M] extends ApiSpec
-          ? Validator<E[Path][M]["params"]>
+          ? ZodValidator<E[Path][M]["params"]>
           : undefined,
       body: () =>
         spec?.body?.safeParse(req.body) as E[Path][M] extends ApiSpec
-          ? Validator<E[Path][M]["body"]>
+          ? ZodValidator<E[Path][M]["body"]>
           : undefined,
       query: () =>
         spec?.query?.safeParse(req.query) as E[Path][M] extends ApiSpec
-          ? Validator<E[Path][M]["query"]>
+          ? ZodValidator<E[Path][M]["query"]>
           : undefined,
     };
   };
 };
 
-type AsyncRequestHandler<Handler extends RequestHandler> = (
+export type AsyncRequestHandler<Handler extends RequestHandler> = (
   req: Parameters<NoInfer<Handler>>[0],
   res: Parameters<NoInfer<Handler>>[1],
   next: Parameters<NoInfer<Handler>>[2],
@@ -123,13 +129,13 @@ export const wrap = <Handler extends RequestHandler>(
 const wrapHandlers = (handlers: never[]) =>
   handlers.map((h) => wrap(h) as never);
 export const asAsync = <T extends ApiEndpoints>(
-  router: TRouter<T>,
-): TRouter<T> => {
+  router: RouterT<T>,
+): RouterT<T> => {
   return Method.reduce((acc, method) => {
     return {
       ...acc,
       [method]: (path: string, ...handlers: never[]) =>
         router[method](path, ...wrapHandlers(handlers)),
     };
-  }, {} as TRouter<T>);
+  }, {} as RouterT<T>);
 };
diff --git a/src/fetch.ts b/src/fetch/index.ts
similarity index 53%
rename from src/fetch.ts
rename to src/fetch/index.ts
index e1a8f24..7f47466 100644
--- a/src/fetch.ts
+++ b/src/fetch/index.ts
@@ -1,22 +1,19 @@
 import {
   ApiBodySchema,
   ApiEndpoints,
-  ApiResponses,
-  ApiResSchema,
   InferOrUndefined,
+  MergeApiResponses,
   Method,
-} from "./spec";
-import { StatusCode, ClientResponse } from "./hono-types";
-import { z } from "zod";
+} from "../common";
 import {
   MatchedPatterns,
   OriginPattern,
   ParseURL,
   ToUrlParamPattern,
-} from "./url";
-import { TypedString } from "./json";
+} from "../common";
+import { TypedString } from "../json";
 
-interface TRequestInit<
+export interface RequestInitT<
   M extends Method,
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
   Body extends Record<string, any> | undefined,
@@ -25,17 +22,7 @@ interface TRequestInit<
   body?: TypedString<Body>;
 }
 
-type ApiClientResponses<AResponses extends ApiResponses> = {
-  [SC in keyof AResponses & StatusCode]: ClientResponse<
-    z.infer<ApiResSchema<AResponses, SC>>,
-    SC,
-    "json"
-  >;
-};
-export type MergeApiResponses<AR extends ApiResponses> =
-  ApiClientResponses<AR>[keyof ApiClientResponses<AR>];
-
-export type TFetch<Origin extends OriginPattern, E extends ApiEndpoints> = <
+type FetchT<Origin extends OriginPattern, E extends ApiEndpoints> = <
   Input extends
     | `${Origin}${ToUrlParamPattern<keyof E & string>}`
     | `${Origin}${ToUrlParamPattern<keyof E & string>}?${string}`,
@@ -44,6 +31,8 @@ export type TFetch<Origin extends OriginPattern, E extends ApiEndpoints> = <
   M extends Method = "get",
 >(
   input: Input,
-  init?: TRequestInit<M, InferOrUndefined<ApiBodySchema<E, CandidatePaths, M>>>,
+  init?: RequestInitT<M, InferOrUndefined<ApiBodySchema<E, CandidatePaths, M>>>,
   // FIXME: NonNullable
 ) => Promise<MergeApiResponses<NonNullable<E[CandidatePaths][M]>["res"]>>;
+
+export default FetchT;
diff --git a/src/index.ts b/src/index.ts
index df75a7b..af3967d 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,3 +1,21 @@
-export * from "./spec";
-export * from "./fetch";
-export * from "./express";
+export * from "./common";
+export {
+  asAsync as expressAsAsync,
+  wrap as expressWrap,
+  AsyncRequestHandler as ExpressAsyncRequestHandler,
+  newValidator as expressNewValidator,
+  typed as expressTyped,
+  ExpressResponse,
+  ValidateLocals as ExpressValidateLocals,
+  RouterT as ExpressRouterT,
+  Handler as ExpressHandler,
+  ParsedQs as ExpressParsedQs,
+} from "./express";
+
+import FetchT, { RequestInitT } from "./fetch";
+export { FetchT, RequestInitT };
+
+import JSONT, { JSON$stringifyT } from "./json";
+export { JSONT, JSON$stringifyT };
+
+export * from "./zod";
diff --git a/src/json.ts b/src/json/index.ts
similarity index 75%
rename from src/json.ts
rename to src/json/index.ts
index 9e8a8fc..112e64a 100644
--- a/src/json.ts
+++ b/src/json/index.ts
@@ -6,3 +6,9 @@ export type JSON$stringifyT = <T>(
   replacer?: undefined,
   space?: number | string | undefined,
 ) => TypedString<T>;
+
+type JSONT = JSON & {
+  stringify: JSON$stringifyT;
+};
+
+export default JSONT;
diff --git a/src/validator.ts b/src/zod/index.ts
similarity index 58%
rename from src/validator.ts
rename to src/zod/index.ts
index a6b48b1..ce6f0ba 100644
--- a/src/validator.ts
+++ b/src/zod/index.ts
@@ -1,10 +1,11 @@
 import { z } from "zod";
-import { ApiSpec } from "./spec";
+import { ApiSpec } from "../common";
+import { FilterNever } from "../common";
 
 type SafeParse<Z extends z.ZodTypeAny> = ReturnType<Z["safeParse"]>;
-export type Validator<V extends z.ZodTypeAny | undefined> =
+export type ZodValidator<V extends z.ZodTypeAny | undefined> =
   V extends z.ZodTypeAny ? () => ReturnType<V["safeParse"]> : never;
-export type Validators<
+export type ZodValidators<
   AS extends ApiSpec,
   QueryKeys extends string,
 > = FilterNever<{
@@ -13,10 +14,6 @@ export type Validators<
     : AS["params"] extends z.ZodTypeAny
       ? () => SafeParse<AS["params"]>
       : () => SafeParse<z.ZodType<Record<QueryKeys, string>>>;
-  query: Validator<AS["query"]>;
-  body: Validator<AS["body"]>;
+  query: ZodValidator<AS["query"]>;
+  body: ZodValidator<AS["body"]>;
 }>;
-
-type FilterNever<T extends Record<string, unknown>> = {
-  [K in keyof T as T[K] extends never ? never : K]: T[K];
-};