diff --git a/cloudflare/dostub.go b/cloudflare/dostub.go
index 104920b..9f733e2 100644
--- a/cloudflare/dostub.go
+++ b/cloudflare/dostub.go
@@ -9,6 +9,7 @@ import (
 	"strings"
 	"syscall/js"
 
+	"github.com/syumai/workers/internal/jshttp"
 	"github.com/syumai/workers/internal/jsutil"
 )
 
@@ -92,7 +93,7 @@ func toHeader(headers js.Value) http.Header {
 func toJSRequest(req *http.Request) js.Value {
 	jsReqOptions := jsutil.NewObject()
 	jsReqOptions.Set("method", req.Method)
-	jsReqOptions.Set("headers", jsutil.ToJSHeader(req.Header))
+	jsReqOptions.Set("headers", jshttp.ToJSHeader(req.Header))
 	jsReqBody := js.Undefined()
 	if req.Body != nil {
 		jsReqBody = jsutil.ConvertReaderToReadableStream(req.Body)
diff --git a/handler.go b/handler.go
index 5bfb84d..ba114c5 100644
--- a/handler.go
+++ b/handler.go
@@ -7,6 +7,7 @@ import (
 	"net/http"
 	"syscall/js"
 
+	"github.com/syumai/workers/internal/jshttp"
 	"github.com/syumai/workers/internal/jsutil"
 	"github.com/syumai/workers/internal/runtimecontext"
 )
@@ -47,14 +48,14 @@ func handleRequest(reqObj js.Value, runtimeCtxObj js.Value) (js.Value, error) {
 	if httpHandler == nil {
 		return js.Value{}, fmt.Errorf("Serve must be called before handleRequest.")
 	}
-	req, err := jsutil.ToRequest(reqObj)
+	req, err := jshttp.ToRequest(reqObj)
 	if err != nil {
 		panic(err)
 	}
 	ctx := runtimecontext.New(context.Background(), runtimeCtxObj)
 	req = req.WithContext(ctx)
 	reader, writer := io.Pipe()
-	w := &jsutil.ResponseWriterBuffer{
+	w := &jshttp.ResponseWriterBuffer{
 		HeaderValue: http.Header{},
 		StatusCode:  http.StatusOK,
 		Reader:      reader,
@@ -66,7 +67,7 @@ func handleRequest(reqObj js.Value, runtimeCtxObj js.Value) (js.Value, error) {
 		defer writer.Close()
 		httpHandler.ServeHTTP(w, req)
 	}()
-	return jsutil.ToJSResponse(w)
+	return jshttp.ToJSResponse(w)
 }
 
 // Server serves http.Handler on Cloudflare Workers.
diff --git a/internal/jsutil/request.go b/internal/jshttp/request.go
similarity index 89%
rename from internal/jsutil/request.go
rename to internal/jshttp/request.go
index 6c44b9f..655a0d3 100644
--- a/internal/jsutil/request.go
+++ b/internal/jshttp/request.go
@@ -1,4 +1,4 @@
-package jsutil
+package jshttp
 
 import (
 	"io"
@@ -7,6 +7,8 @@ import (
 	"strconv"
 	"strings"
 	"syscall/js"
+
+	"github.com/syumai/workers/internal/jsutil"
 )
 
 // ToBody converts JavaScripts sides ReadableStream (can be null) to io.ReadCloser.
@@ -16,13 +18,13 @@ func ToBody(streamOrNull js.Value) io.ReadCloser {
 		return nil
 	}
 	sr := streamOrNull.Call("getReader")
-	return io.NopCloser(ConvertStreamReaderToReader(sr))
+	return io.NopCloser(jsutil.ConvertStreamReaderToReader(sr))
 }
 
 // ToHeader converts JavaScript sides Headers to http.Header.
 //   - Headers: https://developer.mozilla.org/ja/docs/Web/API/Headers
 func ToHeader(headers js.Value) http.Header {
-	entries := ArrayFrom(headers.Call("entries"))
+	entries := jsutil.ArrayFrom(headers.Call("entries"))
 	headerLen := entries.Length()
 	h := http.Header{}
 	for i := 0; i < headerLen; i++ {
diff --git a/internal/jsutil/response.go b/internal/jshttp/response.go
similarity index 66%
rename from internal/jsutil/response.go
rename to internal/jshttp/response.go
index d114af7..5205c57 100644
--- a/internal/jsutil/response.go
+++ b/internal/jshttp/response.go
@@ -1,12 +1,14 @@
-package jsutil
+package jshttp
 
 import (
 	"net/http"
 	"syscall/js"
+
+	"github.com/syumai/workers/internal/jsutil"
 )
 
 func ToJSHeader(header http.Header) js.Value {
-	h := HeadersClass.New()
+	h := jsutil.HeadersClass.New()
 	for key, values := range header {
 		for _, value := range values {
 			h.Call("append", key, value)
@@ -21,10 +23,10 @@ func ToJSResponse(w *ResponseWriterBuffer) (js.Value, error) {
 	if status == 0 {
 		status = http.StatusOK
 	}
-	respInit := NewObject()
+	respInit := jsutil.NewObject()
 	respInit.Set("status", status)
 	respInit.Set("statusText", http.StatusText(status))
 	respInit.Set("headers", ToJSHeader(w.Header()))
-	readableStream := ConvertReaderToReadableStream(w.Reader)
-	return ResponseClass.New(readableStream, respInit), nil
+	readableStream := jsutil.ConvertReaderToReadableStream(w.Reader)
+	return jsutil.ResponseClass.New(readableStream, respInit), nil
 }
diff --git a/internal/jsutil/responsewriter.go b/internal/jshttp/responsewriter.go
similarity index 97%
rename from internal/jsutil/responsewriter.go
rename to internal/jshttp/responsewriter.go
index 62327b4..b58e0f6 100644
--- a/internal/jsutil/responsewriter.go
+++ b/internal/jshttp/responsewriter.go
@@ -1,4 +1,4 @@
-package jsutil
+package jshttp
 
 import (
 	"io"