diff --git a/packages/gems/js/ext/js/js-core.c b/packages/gems/js/ext/js/js-core.c
index d42b47758d..f8cd68badc 100644
--- a/packages/gems/js/ext/js/js-core.c
+++ b/packages/gems/js/ext/js/js-core.c
@@ -580,7 +580,7 @@ void Init_js() {
   rb_define_module_function(rb_mJS, "global", _rb_js_global_this, 0);
 
   i_to_js = rb_intern("to_js");
-  rb_cJS_Object = rb_define_class_under(rb_mJS, "Object", rb_cObject);
+  rb_cJS_Object = rb_define_class_under(rb_mJS, "Object", rb_cBasicObject);
   VALUE rb_cJS_singleton = rb_singleton_class(rb_cJS_Object);
   rb_define_alloc_func(rb_cJS_Object, jsvalue_s_allocate);
   rb_define_method(rb_cJS_Object, "[]", _rb_js_obj_aref, 1);
diff --git a/packages/gems/js/lib/js.rb b/packages/gems/js/lib/js.rb
index cd73649bb4..3564065f82 100644
--- a/packages/gems/js/lib/js.rb
+++ b/packages/gems/js/lib/js.rb
@@ -125,7 +125,20 @@ def self.__async(future, &block)
   end
 end
 
-class JS::Object
+# Inherit BasicObject to prevent define coventional menthods.  #Override the `Object#send` to give priority to `send` method of JavaScript.
+#
+# This is to make it easier to use JavaScript Objects with `send` method such as `WebSocket` and `XMLHttpRequest`.
+# The JavaScript method call short-hand in `JS::Object` is implemented using `method_missing`.
+# If JS::Object inherits from Object, the `send` method defined in Ruby will take precedence over the JavaScript `send` method.
+# If you want to call the JavaScript `send` method, you must use the `call` method as follows:
+#
+#   ws = JS.global[:WebSocket].new("ws://example.com")
+#   ws.call(:send, ["Hello, world! from Ruby"])
+#
+# This inheritation allows you to call the JavaScript `send` method with the following syntax:
+#
+#   ws.send("Hello, world! from Ruby")
+class JS::Object < BasicObject
   # Create a JavaScript object with the new method
   #
   # The below examples show typical usage in Ruby
@@ -141,7 +154,7 @@ class JS::Object
   #
   def new(*args, &block)
     args = args + [block] if block
-    JS.global[:Reflect].construct(self, args.to_js)
+    ::JS.global[:Reflect].construct(self, args.to_js)
   end
 
   # Converts +self+ to an Array:
@@ -149,8 +162,8 @@ def new(*args, &block)
   #   JS.eval("return [1, 2, 3]").to_a.map(&:to_i)    # => [1, 2, 3]
   #   JS.global[:document].querySelectorAll("p").to_a # => [[object HTMLParagraphElement], ...
   def to_a
-    as_array = JS.global[:Array].from(self)
-    Array.new(as_array[:length].to_i) { as_array[_1] }
+    as_array = ::JS.global[:Array].from(self)
+    ::Array.new(as_array[:length].to_i) { as_array[_1] }
   end
 
   # Provide a shorthand form for JS::Object#call
@@ -176,7 +189,7 @@ def method_missing(sym, *args, &block)
       result = invoke_js_method(sym_str[0..-2].to_sym, *args, &block)
       # Type coerce the result to boolean type
       # to match the true/false determination in JavaScript's if statement.
-      return JS.global.Boolean(result) == JS::True
+      return ::JS.global.Boolean(result) == ::JS::True
     end
 
     invoke_js_method(sym, *args, &block)
@@ -186,7 +199,6 @@ def method_missing(sym, *args, &block)
   #
   # See JS::Object#method_missing for details.
   def respond_to_missing?(sym, include_private)
-    return true if super
     sym_str = sym.to_s
     sym = sym_str[0..-2].to_sym if sym_str.end_with?("?")
     self[sym].typeof == "function"
@@ -203,7 +215,7 @@ def respond_to_missing?(sym, include_private)
   #   end.await # => 42
   def apply(*args, &block)
     args = args + [block] if block
-    JS.global[:Reflect].call(:apply, self, JS::Undefined, args.to_js)
+    ::JS.global[:Reflect].call(:apply, self, ::JS::Undefined, args.to_js)
   end
 
   # Await a JavaScript Promise like `await` in JavaScript.
@@ -233,8 +245,17 @@ def apply(*args, &block)
   #   JS.eval("return new Promise((ok, err) => err(new Error())").await           # => raises JS::Error
   def await
     # Promise.resolve wrap a value or flattens promise-like object and its thenable chain
-    promise = JS.global[:Promise].resolve(self)
-    JS.promise_scheduler.await(promise)
+    promise = ::JS.global[:Promise].resolve(self)
+    ::JS.promise_scheduler.await(promise)
+  end
+
+  # The `respond_to?` method is only used in unit tests.
+  # There is little need to define it here.
+  # However, methods suffixed with `?` do not conflict with JavaScript methods.
+  # As there are no disadvantages, we will define the `respond_to?` method here
+  # in the same way as the `nil?` and `is_a?` methods, prioritizing convenience.
+  [:nil?, :is_a?, :raise, :respond_to?].each do |method|
+    define_method(method, ::Object.instance_method(method))
   end
 
   private
@@ -246,12 +267,12 @@ def invoke_js_method(sym, *args, &block)
     return self.call(sym, *args, &block) if self[sym].typeof == "function"
 
     # Check to see if a non-functional property exists.
-    if JS.global[:Reflect].call(:has, self, sym.to_s) == JS::True
-      raise TypeError,
+    if ::JS.global[:Reflect].call(:has, self, sym.to_s) == ::JS::True
+      raise ::TypeError,
             "`#{sym}` is not a function. To reference a property, use `[:#{sym}]` syntax instead."
     end
 
-    raise NoMethodError,
+    raise ::NoMethodError,
           "undefined method `#{sym}' for an instance of JS::Object"
   end
 end
diff --git a/packages/npm-packages/ruby-wasm-wasi/test/unit/test_error.rb b/packages/npm-packages/ruby-wasm-wasi/test/unit/test_error.rb
index 1438a552a4..dfec73599e 100644
--- a/packages/npm-packages/ruby-wasm-wasi/test/unit/test_error.rb
+++ b/packages/npm-packages/ruby-wasm-wasi/test/unit/test_error.rb
@@ -2,6 +2,8 @@
 require "js"
 
 class JS::TestError < Test::Unit::TestCase
+  using JsObjectTestable
+
   def test_throw_error
     e = assert_raise(JS::Error) { JS.eval("throw new Error('foo')") }
     assert_match /^Error: foo/, e.message
diff --git a/packages/npm-packages/ruby-wasm-wasi/test/unit/test_float.rb b/packages/npm-packages/ruby-wasm-wasi/test/unit/test_float.rb
index 917bca56f4..4f6df081de 100644
--- a/packages/npm-packages/ruby-wasm-wasi/test/unit/test_float.rb
+++ b/packages/npm-packages/ruby-wasm-wasi/test/unit/test_float.rb
@@ -2,6 +2,8 @@
 require "js"
 
 class JS::TestFloat < Test::Unit::TestCase
+  using JsObjectTestable
+
   def test_to_js
     assert_equal (1.0).to_js, JS.eval("return 1.0;")
     assert_equal (0.5).to_js, JS.eval("return 0.5;")
diff --git a/packages/npm-packages/ruby-wasm-wasi/test/unit/test_object.rb b/packages/npm-packages/ruby-wasm-wasi/test/unit/test_object.rb
index a0af8241d7..812bebe22b 100644
--- a/packages/npm-packages/ruby-wasm-wasi/test/unit/test_object.rb
+++ b/packages/npm-packages/ruby-wasm-wasi/test/unit/test_object.rb
@@ -368,9 +368,29 @@ def test_respond_to_missing?
     object = JS.eval(<<~JS)
       return { foo() { return true; } };
     JS
-    assert_true object.respond_to?(:foo)
-    assert_true object.respond_to?(:new)
-    assert_false object.respond_to?(:bar)
+    assert_true object.__send__(:respond_to_missing?, :foo, false)
+    assert_false object.__send__(:respond_to_missing?, :bar, false)
+
+    # new is method of JS::Object
+    assert_false object.__send__(:respond_to_missing?, :new, false)
+
+    # send is not implemented in JS::Object,
+    # because JS::Object is a subclass of JS::BaseObject
+    assert_false object.__send__(:respond_to_missing?, :send, false)
+  end
+
+  def test_send_method_for_javascript_object_with_send_method
+    object = JS.eval(<<~JS)
+      return { send(message) { return message; } };
+    JS
+    assert_equal "hello", object.send("hello").to_s
+  end
+
+  def test_send_method_for_javascript_object_without_send_method
+    object = JS.eval(<<~JS)
+      return { write(message) { return message; } };
+    JS
+    assert_raise(NoMethodError) { object.send("hello") }
   end
 
   def test_member_get
diff --git a/packages/npm-packages/ruby-wasm-wasi/tools/run-test-unit.mjs b/packages/npm-packages/ruby-wasm-wasi/tools/run-test-unit.mjs
index 70d8ec06f6..41c850a32d 100755
--- a/packages/npm-packages/ruby-wasm-wasi/tools/run-test-unit.mjs
+++ b/packages/npm-packages/ruby-wasm-wasi/tools/run-test-unit.mjs
@@ -169,6 +169,19 @@ const test = async (instantiate) => {
 
   await vm.evalAsync(`
     require 'test/unit'
+
+    # FIXME: This is a workaround for the test-unit gem.
+    # It will be removed when the next pull request is merged and released.
+    # https://github.com/test-unit/test-unit/pull/262
+    require 'pp'
+    module JsObjectTestable
+      refine JS::Object do
+        [:object_id, :pretty_inspect].each do |method|
+          define_method(method, ::Object.instance_method(method))
+        end
+      end
+    end
+
     require_relative '${rootTestFile}'
     ok = Test::Unit::AutoRunner.run
     exit(1) unless ok