diff --git a/genkeys.go b/genkeys.go
index 1141caed9..16da57d00 100644
--- a/genkeys.go
+++ b/genkeys.go
@@ -503,11 +503,13 @@ const uidriverJsKeysTmpl = `{{.License}}
 package js
 
 import (
+	"syscall/js"
+
 	"github.com/hajimehoshi/ebiten/v2/internal/driver"
 )
 
-var driverKeyToJSKey = map[driver.Key]string{
-{{range $name, $code := .DriverKeyNameToJSKey}}driver.Key{{$name}}: {{$code | printf "%q"}},
+var driverKeyToJSKey = map[driver.Key]js.Value{
+{{range $name, $code := .DriverKeyNameToJSKey}}driver.Key{{$name}}: js.ValueOf({{$code | printf "%q"}}),
 {{end}}
 }
 
diff --git a/internal/uidriver/js/input_js.go b/internal/uidriver/js/input_js.go
index 49bc9d401..7b54bc374 100644
--- a/internal/uidriver/js/input_js.go
+++ b/internal/uidriver/js/input_js.go
@@ -168,7 +168,7 @@ func (i *Input) resetForFrame() {
 
 func (i *Input) IsKeyPressed(key driver.Key) bool {
 	if i.keyPressed != nil {
-		if i.keyPressed[driverKeyToJSKey[key]] {
+		if i.keyPressed[driverKeyToJSKey[key].String()] {
 			return true
 		}
 	}
@@ -210,18 +210,18 @@ func (i *Input) Wheel() (xoff, yoff float64) {
 	return i.wheelX, i.wheelY
 }
 
-func (i *Input) keyDown(code string) {
+func (i *Input) keyDown(code js.Value) {
 	if i.keyPressed == nil {
 		i.keyPressed = map[string]bool{}
 	}
-	i.keyPressed[code] = true
+	i.keyPressed[code.String()] = true
 }
 
-func (i *Input) keyUp(code string) {
+func (i *Input) keyUp(code js.Value) {
 	if i.keyPressed == nil {
 		i.keyPressed = map[string]bool{}
 	}
-	i.keyPressed[code] = false
+	i.keyPressed[code.String()] = false
 }
 
 func (i *Input) keyDownEdge(code int) {
@@ -318,16 +318,15 @@ func (i *Input) Update(e js.Value) {
 			i.keyDownEdge(code)
 			return
 		}
-		cs := c.String()
-		if cs == driverKeyToJSKey[driver.KeyUp] ||
-			cs == driverKeyToJSKey[driver.KeyDown] ||
-			cs == driverKeyToJSKey[driver.KeyLeft] ||
-			cs == driverKeyToJSKey[driver.KeyRight] ||
-			cs == driverKeyToJSKey[driver.KeyBackspace] ||
-			cs == driverKeyToJSKey[driver.KeyTab] {
+		if jsutil.Equal(c, driverKeyToJSKey[driver.KeyUp]) ||
+			jsutil.Equal(c, driverKeyToJSKey[driver.KeyDown]) ||
+			jsutil.Equal(c, driverKeyToJSKey[driver.KeyLeft]) ||
+			jsutil.Equal(c, driverKeyToJSKey[driver.KeyRight]) ||
+			jsutil.Equal(c, driverKeyToJSKey[driver.KeyBackspace]) ||
+			jsutil.Equal(c, driverKeyToJSKey[driver.KeyTab]) {
 			e.Call("preventDefault")
 		}
-		i.keyDown(cs)
+		i.keyDown(c)
 	case jsutil.Equal(t, stringKeypress):
 		if r := rune(e.Get("charCode").Int()); unicode.IsPrint(r) {
 			i.runeBuffer = append(i.runeBuffer, r)
@@ -339,8 +338,7 @@ func (i *Input) Update(e js.Value) {
 			i.keyUpEdge(code)
 			return
 		}
-		code := e.Get("code").String()
-		i.keyUp(code)
+		i.keyUp(e.Get("code"))
 	case jsutil.Equal(t, stringMousedown):
 		button := e.Get("button").Int()
 		i.mouseDown(button)
diff --git a/internal/uidriver/js/keys_js.go b/internal/uidriver/js/keys_js.go
index 4ec659750..95172c917 100644
--- a/internal/uidriver/js/keys_js.go
+++ b/internal/uidriver/js/keys_js.go
@@ -17,115 +17,117 @@
 package js
 
 import (
+	"syscall/js"
+
 	"github.com/hajimehoshi/ebiten/v2/internal/driver"
 )
 
-var driverKeyToJSKey = map[driver.Key]string{
-	driver.Key0:            "Digit0",
-	driver.Key1:            "Digit1",
-	driver.Key2:            "Digit2",
-	driver.Key3:            "Digit3",
-	driver.Key4:            "Digit4",
-	driver.Key5:            "Digit5",
-	driver.Key6:            "Digit6",
-	driver.Key7:            "Digit7",
-	driver.Key8:            "Digit8",
-	driver.Key9:            "Digit9",
-	driver.KeyA:            "KeyA",
-	driver.KeyApostrophe:   "Quote",
-	driver.KeyB:            "KeyB",
-	driver.KeyBackslash:    "Backslash",
-	driver.KeyBackspace:    "Backspace",
-	driver.KeyC:            "KeyC",
-	driver.KeyCapsLock:     "CapsLock",
-	driver.KeyComma:        "Comma",
-	driver.KeyD:            "KeyD",
-	driver.KeyDelete:       "Delete",
-	driver.KeyDown:         "ArrowDown",
-	driver.KeyE:            "KeyE",
-	driver.KeyEnd:          "End",
-	driver.KeyEnter:        "Enter",
-	driver.KeyEqual:        "Equal",
-	driver.KeyEscape:       "Escape",
-	driver.KeyF:            "KeyF",
-	driver.KeyF1:           "F1",
-	driver.KeyF10:          "F10",
-	driver.KeyF11:          "F11",
-	driver.KeyF12:          "F12",
-	driver.KeyF2:           "F2",
-	driver.KeyF3:           "F3",
-	driver.KeyF4:           "F4",
-	driver.KeyF5:           "F5",
-	driver.KeyF6:           "F6",
-	driver.KeyF7:           "F7",
-	driver.KeyF8:           "F8",
-	driver.KeyF9:           "F9",
-	driver.KeyG:            "KeyG",
-	driver.KeyGraveAccent:  "Backquote",
-	driver.KeyH:            "KeyH",
-	driver.KeyHome:         "Home",
-	driver.KeyI:            "KeyI",
-	driver.KeyInsert:       "Insert",
-	driver.KeyJ:            "KeyJ",
-	driver.KeyK:            "KeyK",
-	driver.KeyKP0:          "Numpad0",
-	driver.KeyKP1:          "Numpad1",
-	driver.KeyKP2:          "Numpad2",
-	driver.KeyKP3:          "Numpad3",
-	driver.KeyKP4:          "Numpad4",
-	driver.KeyKP5:          "Numpad5",
-	driver.KeyKP6:          "Numpad6",
-	driver.KeyKP7:          "Numpad7",
-	driver.KeyKP8:          "Numpad8",
-	driver.KeyKP9:          "Numpad9",
-	driver.KeyKPAdd:        "NumpadAdd",
-	driver.KeyKPDecimal:    "NumpadDecimal",
-	driver.KeyKPDivide:     "NumpadDivide",
-	driver.KeyKPEnter:      "NumpadEnter",
-	driver.KeyKPEqual:      "NumpadEqual",
-	driver.KeyKPMultiply:   "NumpadMultiply",
-	driver.KeyKPSubtract:   "NumpadSubtract",
-	driver.KeyL:            "KeyL",
-	driver.KeyLeft:         "ArrowLeft",
-	driver.KeyLeftAlt:      "AltLeft",
-	driver.KeyLeftBracket:  "BracketLeft",
-	driver.KeyLeftControl:  "ControlLeft",
-	driver.KeyLeftShift:    "ShiftLeft",
-	driver.KeyLeftSuper:    "MetaLeft",
-	driver.KeyM:            "KeyM",
-	driver.KeyMenu:         "ContextMenu",
-	driver.KeyMinus:        "Minus",
-	driver.KeyN:            "KeyN",
-	driver.KeyNumLock:      "NumLock",
-	driver.KeyO:            "KeyO",
-	driver.KeyP:            "KeyP",
-	driver.KeyPageDown:     "PageDown",
-	driver.KeyPageUp:       "PageUp",
-	driver.KeyPause:        "Pause",
-	driver.KeyPeriod:       "Period",
-	driver.KeyPrintScreen:  "PrintScreen",
-	driver.KeyQ:            "KeyQ",
-	driver.KeyR:            "KeyR",
-	driver.KeyRight:        "ArrowRight",
-	driver.KeyRightAlt:     "AltRight",
-	driver.KeyRightBracket: "BracketRight",
-	driver.KeyRightControl: "ControlRight",
-	driver.KeyRightShift:   "ShiftRight",
-	driver.KeyRightSuper:   "MetaRight",
-	driver.KeyS:            "KeyS",
-	driver.KeyScrollLock:   "ScrollLock",
-	driver.KeySemicolon:    "Semicolon",
-	driver.KeySlash:        "Slash",
-	driver.KeySpace:        "Space",
-	driver.KeyT:            "KeyT",
-	driver.KeyTab:          "Tab",
-	driver.KeyU:            "KeyU",
-	driver.KeyUp:           "ArrowUp",
-	driver.KeyV:            "KeyV",
-	driver.KeyW:            "KeyW",
-	driver.KeyX:            "KeyX",
-	driver.KeyY:            "KeyY",
-	driver.KeyZ:            "KeyZ",
+var driverKeyToJSKey = map[driver.Key]js.Value{
+	driver.Key0:            js.ValueOf("Digit0"),
+	driver.Key1:            js.ValueOf("Digit1"),
+	driver.Key2:            js.ValueOf("Digit2"),
+	driver.Key3:            js.ValueOf("Digit3"),
+	driver.Key4:            js.ValueOf("Digit4"),
+	driver.Key5:            js.ValueOf("Digit5"),
+	driver.Key6:            js.ValueOf("Digit6"),
+	driver.Key7:            js.ValueOf("Digit7"),
+	driver.Key8:            js.ValueOf("Digit8"),
+	driver.Key9:            js.ValueOf("Digit9"),
+	driver.KeyA:            js.ValueOf("KeyA"),
+	driver.KeyApostrophe:   js.ValueOf("Quote"),
+	driver.KeyB:            js.ValueOf("KeyB"),
+	driver.KeyBackslash:    js.ValueOf("Backslash"),
+	driver.KeyBackspace:    js.ValueOf("Backspace"),
+	driver.KeyC:            js.ValueOf("KeyC"),
+	driver.KeyCapsLock:     js.ValueOf("CapsLock"),
+	driver.KeyComma:        js.ValueOf("Comma"),
+	driver.KeyD:            js.ValueOf("KeyD"),
+	driver.KeyDelete:       js.ValueOf("Delete"),
+	driver.KeyDown:         js.ValueOf("ArrowDown"),
+	driver.KeyE:            js.ValueOf("KeyE"),
+	driver.KeyEnd:          js.ValueOf("End"),
+	driver.KeyEnter:        js.ValueOf("Enter"),
+	driver.KeyEqual:        js.ValueOf("Equal"),
+	driver.KeyEscape:       js.ValueOf("Escape"),
+	driver.KeyF:            js.ValueOf("KeyF"),
+	driver.KeyF1:           js.ValueOf("F1"),
+	driver.KeyF10:          js.ValueOf("F10"),
+	driver.KeyF11:          js.ValueOf("F11"),
+	driver.KeyF12:          js.ValueOf("F12"),
+	driver.KeyF2:           js.ValueOf("F2"),
+	driver.KeyF3:           js.ValueOf("F3"),
+	driver.KeyF4:           js.ValueOf("F4"),
+	driver.KeyF5:           js.ValueOf("F5"),
+	driver.KeyF6:           js.ValueOf("F6"),
+	driver.KeyF7:           js.ValueOf("F7"),
+	driver.KeyF8:           js.ValueOf("F8"),
+	driver.KeyF9:           js.ValueOf("F9"),
+	driver.KeyG:            js.ValueOf("KeyG"),
+	driver.KeyGraveAccent:  js.ValueOf("Backquote"),
+	driver.KeyH:            js.ValueOf("KeyH"),
+	driver.KeyHome:         js.ValueOf("Home"),
+	driver.KeyI:            js.ValueOf("KeyI"),
+	driver.KeyInsert:       js.ValueOf("Insert"),
+	driver.KeyJ:            js.ValueOf("KeyJ"),
+	driver.KeyK:            js.ValueOf("KeyK"),
+	driver.KeyKP0:          js.ValueOf("Numpad0"),
+	driver.KeyKP1:          js.ValueOf("Numpad1"),
+	driver.KeyKP2:          js.ValueOf("Numpad2"),
+	driver.KeyKP3:          js.ValueOf("Numpad3"),
+	driver.KeyKP4:          js.ValueOf("Numpad4"),
+	driver.KeyKP5:          js.ValueOf("Numpad5"),
+	driver.KeyKP6:          js.ValueOf("Numpad6"),
+	driver.KeyKP7:          js.ValueOf("Numpad7"),
+	driver.KeyKP8:          js.ValueOf("Numpad8"),
+	driver.KeyKP9:          js.ValueOf("Numpad9"),
+	driver.KeyKPAdd:        js.ValueOf("NumpadAdd"),
+	driver.KeyKPDecimal:    js.ValueOf("NumpadDecimal"),
+	driver.KeyKPDivide:     js.ValueOf("NumpadDivide"),
+	driver.KeyKPEnter:      js.ValueOf("NumpadEnter"),
+	driver.KeyKPEqual:      js.ValueOf("NumpadEqual"),
+	driver.KeyKPMultiply:   js.ValueOf("NumpadMultiply"),
+	driver.KeyKPSubtract:   js.ValueOf("NumpadSubtract"),
+	driver.KeyL:            js.ValueOf("KeyL"),
+	driver.KeyLeft:         js.ValueOf("ArrowLeft"),
+	driver.KeyLeftAlt:      js.ValueOf("AltLeft"),
+	driver.KeyLeftBracket:  js.ValueOf("BracketLeft"),
+	driver.KeyLeftControl:  js.ValueOf("ControlLeft"),
+	driver.KeyLeftShift:    js.ValueOf("ShiftLeft"),
+	driver.KeyLeftSuper:    js.ValueOf("MetaLeft"),
+	driver.KeyM:            js.ValueOf("KeyM"),
+	driver.KeyMenu:         js.ValueOf("ContextMenu"),
+	driver.KeyMinus:        js.ValueOf("Minus"),
+	driver.KeyN:            js.ValueOf("KeyN"),
+	driver.KeyNumLock:      js.ValueOf("NumLock"),
+	driver.KeyO:            js.ValueOf("KeyO"),
+	driver.KeyP:            js.ValueOf("KeyP"),
+	driver.KeyPageDown:     js.ValueOf("PageDown"),
+	driver.KeyPageUp:       js.ValueOf("PageUp"),
+	driver.KeyPause:        js.ValueOf("Pause"),
+	driver.KeyPeriod:       js.ValueOf("Period"),
+	driver.KeyPrintScreen:  js.ValueOf("PrintScreen"),
+	driver.KeyQ:            js.ValueOf("KeyQ"),
+	driver.KeyR:            js.ValueOf("KeyR"),
+	driver.KeyRight:        js.ValueOf("ArrowRight"),
+	driver.KeyRightAlt:     js.ValueOf("AltRight"),
+	driver.KeyRightBracket: js.ValueOf("BracketRight"),
+	driver.KeyRightControl: js.ValueOf("ControlRight"),
+	driver.KeyRightShift:   js.ValueOf("ShiftRight"),
+	driver.KeyRightSuper:   js.ValueOf("MetaRight"),
+	driver.KeyS:            js.ValueOf("KeyS"),
+	driver.KeyScrollLock:   js.ValueOf("ScrollLock"),
+	driver.KeySemicolon:    js.ValueOf("Semicolon"),
+	driver.KeySlash:        js.ValueOf("Slash"),
+	driver.KeySpace:        js.ValueOf("Space"),
+	driver.KeyT:            js.ValueOf("KeyT"),
+	driver.KeyTab:          js.ValueOf("Tab"),
+	driver.KeyU:            js.ValueOf("KeyU"),
+	driver.KeyUp:           js.ValueOf("ArrowUp"),
+	driver.KeyV:            js.ValueOf("KeyV"),
+	driver.KeyW:            js.ValueOf("KeyW"),
+	driver.KeyX:            js.ValueOf("KeyX"),
+	driver.KeyY:            js.ValueOf("KeyY"),
+	driver.KeyZ:            js.ValueOf("KeyZ"),
 }
 
 var edgeKeyCodeToDriverKey = map[int]driver.Key{