diff --git a/CHANGELOG.md b/CHANGELOG.md
index 20fc3c5f2..d8e756d12 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,7 +21,7 @@
       - new module, fully overhauled, replaces dialog, keyboard, submenu, textbox modules
       - higher barrier to entry than older modules (requires usage of `event_loop` and `gui.viewDispatcher`), but much more flexible, powerful and easier to extend
       - includes all previously available js gui functionality (except `widget`), and also adds `gui/loading` and `gui/empty_screen` views
-      - existing scripts using gui in any way will need a huge amount of reworking
+      - currently `gui/file_picker` works different than other new view objects, it is a simple `.pickFile()` synchronous function, but this [may change later](https://github.com/flipperdevices/flipperzero-firmware/pull/3961#discussion_r1805579153)
       - effort required to update old scripts using gui: extensive
     - `keyboard`:
       - removed, now replaced by `gui/text_input` and `gui/byte_input` (see above)
@@ -38,10 +38,10 @@
       - only gui functionality not ported to new gui module, remains unchanged for now but likely to be ported later on
     - globals:
       - `__filepath` and `__dirpath` renamed to `__filename` and `__dirname` like in nodejs
-      - `to_string()` renamed to `toString()`, now supports optional base parameter
+      - `to_string()` renamed and moved to number class as `n.toString()`, now supports optional base parameter
       - `to_hex_string()` removed, now use `toString(num, 16)`
       - `parse_int()` renamed to `parseInt()`, now supports optional base parameter
-      - `to_upper_case()` and `to_lower_case()` renamed and moved to string class as `"".toUpperCase()` and `"".toLowerCase()`
+      - `to_upper_case()` and `to_lower_case()` renamed and moved to string class as `s.toUpperCase()` and `s.toLowerCase()`
       - effort required to update old scripts using these: minimal
   - Added type definitions (typescript files for type checking in IDE, Flipper does not run typescript, and you code in javascript)
   - Documentation is incomplete and deprecated, from now on you should refer to type definitions (`applications/system/js_app/types`), those will always be correct
diff --git a/applications/system/js_app/application.fam b/applications/system/js_app/application.fam
index a29251f0e..65fafed76 100644
--- a/applications/system/js_app/application.fam
+++ b/applications/system/js_app/application.fam
@@ -53,7 +53,7 @@ App(
     appid="js_gui",
     apptype=FlipperAppType.PLUGIN,
     entry_point="js_gui_ep",
-    requires=["js_app", "js_event_loop"],
+    requires=["js_app"],
     sources=["modules/js_gui/js_gui.c", "modules/js_gui/js_gui_api_table.cpp"],
 )
 
@@ -61,7 +61,7 @@ App(
     appid="js_gui__loading",
     apptype=FlipperAppType.PLUGIN,
     entry_point="js_view_loading_ep",
-    requires=["js_app", "js_gui", "js_event_loop"],
+    requires=["js_app"],
     sources=["modules/js_gui/loading.c"],
 )
 
@@ -69,7 +69,7 @@ App(
     appid="js_gui__empty_screen",
     apptype=FlipperAppType.PLUGIN,
     entry_point="js_view_empty_screen_ep",
-    requires=["js_app", "js_gui", "js_event_loop"],
+    requires=["js_app"],
     sources=["modules/js_gui/empty_screen.c"],
 )
 
@@ -77,7 +77,7 @@ App(
     appid="js_gui__submenu",
     apptype=FlipperAppType.PLUGIN,
     entry_point="js_view_submenu_ep",
-    requires=["js_app", "js_gui"],
+    requires=["js_app"],
     sources=["modules/js_gui/submenu.c"],
 )
 
@@ -85,7 +85,7 @@ App(
     appid="js_gui__text_input",
     apptype=FlipperAppType.PLUGIN,
     entry_point="js_view_text_input_ep",
-    requires=["js_app", "js_gui", "js_event_loop"],
+    requires=["js_app"],
     sources=["modules/js_gui/text_input.c"],
 )
 
@@ -93,7 +93,7 @@ App(
     appid="js_gui__byte_input",
     apptype=FlipperAppType.PLUGIN,
     entry_point="js_view_byte_input_ep",
-    requires=["js_app", "js_gui", "js_event_loop"],
+    requires=["js_app"],
     sources=["modules/js_gui/byte_input.c"],
 )
 
@@ -149,7 +149,7 @@ App(
     appid="js_gpio",
     apptype=FlipperAppType.PLUGIN,
     entry_point="js_gpio_ep",
-    requires=["js_app", "js_event_loop"],
+    requires=["js_app"],
     sources=["modules/js_gpio.c"],
 )
 
diff --git a/applications/system/js_app/examples/apps/Scripts/Examples/badusb_demo.js b/applications/system/js_app/examples/apps/Scripts/Examples/badusb_demo.js
index 758cffd13..d1ace3845 100644
--- a/applications/system/js_app/examples/apps/Scripts/Examples/badusb_demo.js
+++ b/applications/system/js_app/examples/apps/Scripts/Examples/badusb_demo.js
@@ -45,7 +45,7 @@ eventLoop.subscribe(views.dialog.input, function (_sub, button, eventLoop, gui)
 
         badusb.println("Flipper Model: " + flipper.getModel());
         badusb.println("Flipper Name: " + flipper.getName());
-        badusb.println("Battery level: " + toString(flipper.getBatteryCharge()) + "%");
+        badusb.println("Battery level: " + flipper.getBatteryCharge().toString() + "%");
 
         // Alt+Numpad method works only on Windows!!!
         badusb.altPrintln("This was printed with Alt+Numpad method!");
diff --git a/applications/system/js_app/examples/apps/Scripts/Examples/blebeacon.js b/applications/system/js_app/examples/apps/Scripts/Examples/blebeacon.js
index 9a30ad151..1187f1c20 100644
--- a/applications/system/js_app/examples/apps/Scripts/Examples/blebeacon.js
+++ b/applications/system/js_app/examples/apps/Scripts/Examples/blebeacon.js
@@ -45,7 +45,7 @@ function sendRandomModelAdvertisement() {
 
     blebeacon.start();
 
-    print("Sent data for model ID " + toString(model));
+    print("Sent data for model ID " + model.toString());
 
     currentIndex = (currentIndex + 1) % watchValues.length;
 
diff --git a/applications/system/js_app/examples/apps/Scripts/Examples/gui.js b/applications/system/js_app/examples/apps/Scripts/Examples/gui.js
index 10e88b649..5faeb6d32 100644
--- a/applications/system/js_app/examples/apps/Scripts/Examples/gui.js
+++ b/applications/system/js_app/examples/apps/Scripts/Examples/gui.js
@@ -97,7 +97,7 @@ eventLoop.subscribe(views.bytekb.input, function (_sub, data, gui, views) {
     let data_view = Uint8Array(data);
     let text = "0x";
     for (let i = 0; i < data_view.length; i++) {
-        text += toString(data_view[i], 16);
+        text += data_view[i].toString(16);
     }
     views.helloDialog.set("text", "You typed:\n" + text);
     views.helloDialog.set("center", "Cool!");
diff --git a/applications/system/js_app/examples/apps/Scripts/Examples/stringutils.js b/applications/system/js_app/examples/apps/Scripts/Examples/stringutils.js
index 7c57f9bc5..b2facb237 100644
--- a/applications/system/js_app/examples/apps/Scripts/Examples/stringutils.js
+++ b/applications/system/js_app/examples/apps/Scripts/Examples/stringutils.js
@@ -1,6 +1,6 @@
 let sampleText = "Hello, World!";
 
-let lengthOfText = "Length of text: " + toString(sampleText.length);
+let lengthOfText = "Length of text: " + sampleText.length.toString();
 print(lengthOfText);
 
 let start = 7;
@@ -9,7 +9,7 @@ let substringResult = sampleText.slice(start, end);
 print(substringResult);
 
 let searchStr = "World";
-let result2 = toString(sampleText.indexOf(searchStr));
+let result2 = sampleText.indexOf(searchStr).toString();
 print(result2);
 
 let upperCaseText = "Text in upper case: " + sampleText.toUpperCase();
diff --git a/applications/system/js_app/examples/apps/Scripts/Examples/uart_echo.js b/applications/system/js_app/examples/apps/Scripts/Examples/uart_echo.js
index 72b4617a6..d43c0baa3 100644
--- a/applications/system/js_app/examples/apps/Scripts/Examples/uart_echo.js
+++ b/applications/system/js_app/examples/apps/Scripts/Examples/uart_echo.js
@@ -6,7 +6,7 @@ while (1) {
     if (rx_data !== undefined) {
         serial.write(rx_data);
         let data_view = Uint8Array(rx_data);
-        print("0x" + toString(data_view[0], 16));
+        print("0x" + data_view[0].toString(16));
     }
 }
 
diff --git a/applications/system/js_app/examples/apps/Scripts/interactive.js b/applications/system/js_app/examples/apps/Scripts/interactive.js
index 29f3bb253..34639cdac 100644
--- a/applications/system/js_app/examples/apps/Scripts/interactive.js
+++ b/applications/system/js_app/examples/apps/Scripts/interactive.js
@@ -42,7 +42,7 @@ eventLoop.subscribe(views.dialog.input, function (_sub, button, gui, views) {
 eventLoop.subscribe(views.textInput.input, function (_sub, text, gui, views, ctx) {
     gui.viewDispatcher.switchTo(views.loading);
 
-    let path = ctx.tmpTemplate + toString(ctx.tmpNumber++);
+    let path = ctx.tmpTemplate + (ctx.tmpNumber++).toString();
     let file = storage.openFile(path, "w", "create_always");
     file.write(text);
     file.close();
@@ -58,7 +58,7 @@ eventLoop.subscribe(views.textInput.input, function (_sub, text, gui, views, ctx
     } else if (typeof result === "string") {
         result = "'" + result + "'";
     } else if (typeof result === "number") {
-        result = toString(result);
+        result = result.toString();
     } else if (typeof result === "bigint") { // mJS doesn't support BigInt() but might aswell check
         result = "bigint";
     } else if (typeof result === "boolean") {
diff --git a/applications/system/js_app/js_thread.c b/applications/system/js_app/js_thread.c
index 31e9f721e..7a774d324 100644
--- a/applications/system/js_app/js_thread.c
+++ b/applications/system/js_app/js_thread.c
@@ -196,16 +196,6 @@ static void js_require(struct mjs* mjs) {
     mjs_return(mjs, req_object);
 }
 
-static void js_global_to_string(struct mjs* mjs) {
-    int base = 10;
-    if(mjs_nargs(mjs) > 1) base = mjs_get_int(mjs, mjs_arg(mjs, 1));
-    double num = mjs_get_double(mjs, mjs_arg(mjs, 0));
-    char tmp_str[] = "-2147483648";
-    itoa(num, tmp_str, base);
-    mjs_val_t ret = mjs_mk_string(mjs, tmp_str, ~0, true);
-    mjs_return(mjs, ret);
-}
-
 static void js_parse_int(struct mjs* mjs) {
     const char* str;
     int32_t base = 10;
@@ -268,7 +258,6 @@ static int32_t js_thread(void* arg) {
     }
     mjs_set(mjs, global, "print", ~0, MJS_MK_FN(js_print));
     mjs_set(mjs, global, "delay", ~0, MJS_MK_FN(js_delay));
-    mjs_set(mjs, global, "toString", ~0, MJS_MK_FN(js_global_to_string));
     mjs_set(mjs, global, "ffi_address", ~0, MJS_MK_FN(js_ffi_address));
     mjs_set(mjs, global, "require", ~0, MJS_MK_FN(js_require));
     mjs_set(mjs, global, "parseInt", ~0, MJS_MK_FN(js_parse_int));
diff --git a/applications/system/js_app/modules/js_gui/js_gui.c b/applications/system/js_app/modules/js_gui/js_gui.c
index cd87e5c4b..4bd4ccc31 100644
--- a/applications/system/js_app/modules/js_gui/js_gui.c
+++ b/applications/system/js_app/modules/js_gui/js_gui.c
@@ -260,26 +260,6 @@ static void js_gui_view_set(struct mjs* mjs) {
     mjs_return(mjs, MJS_UNDEFINED);
 }
 
-/**
- * @brief `View.hasProperty`
- */
-static void js_gui_view_has_property(struct mjs* mjs) {
-    const char* name;
-    JS_FETCH_ARGS_OR_RETURN(mjs, JS_EXACTLY, JS_ARG_STR(&name));
-    JsGuiViewData* data = JS_GET_CONTEXT(mjs);
-    const JsViewDescriptor* descriptor = data->descriptor;
-
-    for(size_t i = 0; i < descriptor->prop_cnt; i++) {
-        JsViewPropDescriptor prop = descriptor->props[i];
-        if(strcmp(prop.name, name) != 0) continue;
-
-        mjs_return(mjs, mjs_mk_boolean(mjs, true));
-        return;
-    }
-
-    mjs_return(mjs, mjs_mk_boolean(mjs, false));
-}
-
 /**
  * @brief `View` destructor
  */
@@ -304,7 +284,6 @@ static mjs_val_t js_gui_make_view(struct mjs* mjs, const JsViewDescriptor* descr
     // generic view API
     mjs_val_t view_obj = mjs_mk_object(mjs);
     mjs_set(mjs, view_obj, "set", ~0, MJS_MK_FN(js_gui_view_set));
-    mjs_set(mjs, view_obj, "hasProperty", ~0, MJS_MK_FN(js_gui_view_has_property));
 
     // object data
     JsGuiViewData* data = malloc(sizeof(JsGuiViewData));
diff --git a/applications/system/js_app/types/global.d.ts b/applications/system/js_app/types/global.d.ts
index 052a2bb6a..d132f89f5 100644
--- a/applications/system/js_app/types/global.d.ts
+++ b/applications/system/js_app/types/global.d.ts
@@ -11,13 +11,6 @@ declare function delay(ms: number): void;
  */
 declare function print(...args: any[]): void;
 
-/**
- * @brief Converts a number to a string
- * @param value The number to convert to a string
- * @param base Integer base (`2`...`16`), default: 10
- */
-declare function toString(value: number, base?: number): string;
-
 /**
  * @brief Converts a string to a number
  * @param text The string to convert to a number
@@ -214,7 +207,13 @@ declare class Boolean { }
 
 declare class Function { }
 
-declare class Number { }
+declare class Number {
+    /**
+     * @brief Converts this number to a string
+     * @param base Integer base (`2`...`16`), default: 10
+     */
+    toString(base?: number): string;
+}
 
 declare class Object { }
 
diff --git a/applications/system/js_app/types/gui/index.d.ts b/applications/system/js_app/types/gui/index.d.ts
index 5efcfdc03..d4cdc6bc9 100644
--- a/applications/system/js_app/types/gui/index.d.ts
+++ b/applications/system/js_app/types/gui/index.d.ts
@@ -9,11 +9,6 @@ export declare class View<Props extends Properties> {
      * @param value Value to assign
      */
     set<P extends keyof Props>(property: P, value: Props[P]): void;
-    /**
-     * Check if property is available
-     * @param name Name of the property
-     */
-    hasProperty(name: string): boolean;
 }
 
 export declare class ViewFactory<Props extends Properties, V extends View<Props>> {
diff --git a/lib/mjs/mjs_exec.c b/lib/mjs/mjs_exec.c
index 0213a871e..8fdb2d7e5 100644
--- a/lib/mjs/mjs_exec.c
+++ b/lib/mjs/mjs_exec.c
@@ -475,6 +475,22 @@ static int getprop_builtin_string(
     return 0;
 }
 
+static int getprop_builtin_number(
+    struct mjs* mjs,
+    mjs_val_t val,
+    const char* name,
+    size_t name_len,
+    mjs_val_t* res) {
+    if(strcmp(name, "toString") == 0) {
+        *res = mjs_mk_foreign_func(mjs, (mjs_func_ptr_t)mjs_number_to_string);
+        return 1;
+    }
+
+    (void)val;
+    (void)name_len;
+    return 0;
+}
+
 static int getprop_builtin_array(
     struct mjs* mjs,
     mjs_val_t val,
@@ -589,6 +605,8 @@ static int getprop_builtin(struct mjs* mjs, mjs_val_t val, mjs_val_t name, mjs_v
         } else if(s != NULL && n == 5 && strncmp(s, "apply", n) == 0) {
             *res = mjs_mk_foreign_func(mjs, (mjs_func_ptr_t)mjs_apply_);
             handled = 1;
+        } else if(mjs_is_number(val)) {
+            handled = getprop_builtin_number(mjs, val, s, n, res);
         } else if(mjs_is_array(val)) {
             handled = getprop_builtin_array(mjs, val, s, n, res);
         } else if(mjs_is_foreign(val)) {
diff --git a/lib/mjs/mjs_primitive.c b/lib/mjs/mjs_primitive.c
index b63a268e5..e73ae892d 100644
--- a/lib/mjs/mjs_primitive.c
+++ b/lib/mjs/mjs_primitive.c
@@ -6,6 +6,8 @@
 #include "mjs_core.h"
 #include "mjs_internal.h"
 #include "mjs_primitive.h"
+#include "mjs_string_public.h"
+#include "mjs_util.h"
 
 mjs_val_t mjs_mk_null(void) {
     return MJS_NULL;
@@ -158,3 +160,31 @@ MJS_PRIVATE void mjs_op_isnan(struct mjs* mjs) {
 
     mjs_return(mjs, ret);
 }
+
+MJS_PRIVATE void mjs_number_to_string(struct mjs* mjs) {
+    mjs_val_t ret = MJS_UNDEFINED;
+    mjs_val_t base_v = MJS_UNDEFINED;
+    int32_t base = 10;
+    int32_t num;
+
+    /* get number from `this` */
+    if(!mjs_check_arg(mjs, -1 /*this*/, "this", MJS_TYPE_NUMBER, NULL)) {
+        goto clean;
+    }
+    num = mjs_get_int32(mjs, mjs->vals.this_obj);
+
+    if(mjs_nargs(mjs) >= 1) {
+        /* get base from arg 0 */
+        if(!mjs_check_arg(mjs, 0, "base", MJS_TYPE_NUMBER, &base_v)) {
+            goto clean;
+        }
+        base = mjs_get_int(mjs, base_v);
+    }
+
+    char tmp_str[] = "-2147483648";
+    itoa(num, tmp_str, base);
+    ret = mjs_mk_string(mjs, tmp_str, ~0, true);
+
+clean:
+    mjs_return(mjs, ret);
+}
diff --git a/lib/mjs/mjs_primitive.h b/lib/mjs/mjs_primitive.h
index 6d6f91785..f1c3c8220 100644
--- a/lib/mjs/mjs_primitive.h
+++ b/lib/mjs/mjs_primitive.h
@@ -34,6 +34,11 @@ MJS_PRIVATE void* get_ptr(mjs_val_t v);
  */
 MJS_PRIVATE void mjs_op_isnan(struct mjs* mjs);
 
+/*
+ * Implementation for JS Number.toString()
+ */
+MJS_PRIVATE void mjs_number_to_string(struct mjs* mjs);
+
 #if defined(__cplusplus)
 }
 #endif /* __cplusplus */