diff --git a/applications/system/js_app/examples/apps/Scripts/stringutils.js b/applications/system/js_app/examples/apps/Scripts/stringutils.js
index bb3c8c16e..a29669868 100644
--- a/applications/system/js_app/examples/apps/Scripts/stringutils.js
+++ b/applications/system/js_app/examples/apps/Scripts/stringutils.js
@@ -1,15 +1,15 @@
 let sampleText = "Hello, World!";
 
-let lengthOfText = "Length of text: " + to_string(GetLength(sampleText));
+let lengthOfText = "Length of text: " + to_string(sampleText.length);
 print(lengthOfText);
 
 let start = 7;
 let end = 12;
-let substringResult = substring(sampleText, start, end);
+let substringResult = sampleText.slice(start, end);
 print(substringResult);
 
 let searchStr = "World";
-let result2 = to_string(indexOf(sampleText, searchStr));
+let result2 = to_string(sampleText.indexOf(searchStr));
 print(result2);
 
 let upperCaseText = "Text in upper case: " + toUpperCase(sampleText);
diff --git a/applications/system/js_app/modules/js_string.h b/applications/system/js_app/modules/js_string.h
index 6cab20238..b812513f5 100644
--- a/applications/system/js_app/modules/js_string.h
+++ b/applications/system/js_app/modules/js_string.h
@@ -1,98 +1,5 @@
 #include "../js_modules.h"
 
-static void js_string_substring(struct mjs* mjs) {
-    mjs_val_t arg0 = mjs_arg(mjs, 0);
-    mjs_val_t arg1 = mjs_arg(mjs, 1);
-    mjs_val_t arg2 = mjs_arg(mjs, 2);
-
-    size_t str_len;
-    const char* str = NULL;
-    if(mjs_is_string(arg0)) {
-        str = mjs_get_string(mjs, &arg0, &str_len);
-    } else {
-        mjs_return(mjs, MJS_UNDEFINED);
-        return;
-    }
-
-    size_t start = mjs_is_number(arg1) ? (size_t)mjs_get_int(mjs, arg1) : (size_t)-1;
-    size_t end = mjs_is_number(arg2) ? (size_t)mjs_get_int(mjs, arg2) : (size_t)str_len;
-
-    if((int)start < 0 || end > str_len || start > end) {
-        mjs_return(mjs, MJS_UNDEFINED);
-        return;
-    }
-
-    mjs_val_t substr_obj = mjs_mk_string(mjs, str + start, end - start, 1);
-    mjs_return(mjs, substr_obj);
-}
-
-static void js_string_get_length(struct mjs* mjs) {
-    mjs_val_t arg0 = mjs_arg(mjs, 0);
-    size_t str_len;
-    if(mjs_is_string(arg0)) {
-        const char* str = mjs_get_string(mjs, &arg0, &str_len);
-        UNUSED(str);
-        mjs_return(mjs, mjs_mk_number(mjs, str_len));
-    } else {
-        mjs_return(mjs, MJS_UNDEFINED);
-    }
-}
-
-static void js_string_slice(struct mjs* mjs) {
-    mjs_val_t arg0 = mjs_arg(mjs, 0);
-    mjs_val_t arg1 = mjs_arg(mjs, 1);
-    mjs_val_t arg2 = mjs_arg(mjs, 2);
-
-    size_t str_len;
-    const char* str = NULL;
-    if(mjs_is_string(arg0)) {
-        str = mjs_get_string(mjs, &arg0, &str_len);
-    } else {
-        mjs_return(mjs, MJS_UNDEFINED);
-        return;
-    }
-
-    int start = mjs_is_number(arg1) ? mjs_get_int(mjs, arg1) : 0;
-    int end = mjs_is_number(arg2) ? mjs_get_int(mjs, arg2) : (int)str_len;
-
-    if(start < 0) start = (int)str_len + start < 0 ? 0 : (int)str_len + start;
-    if(end < 0) end = (int)str_len + end < 0 ? 0 : (int)str_len + end;
-    start = start > (int)str_len ? (int)str_len : start;
-    end = end > (int)str_len ? (int)str_len : end;
-
-    if(end < start) end = start;
-
-    mjs_val_t resultStr = mjs_mk_string(mjs, str + start, end - start, 1);
-    mjs_return(mjs, resultStr);
-}
-
-static void js_string_index_of(struct mjs* mjs) {
-    mjs_val_t arg0 = mjs_arg(mjs, 0);
-    mjs_val_t arg1 = mjs_arg(mjs, 1);
-
-    size_t str_len;
-    const char* str = NULL;
-    if(mjs_is_string(arg0)) {
-        str = mjs_get_string(mjs, &arg0, &str_len);
-    } else {
-        mjs_return(mjs, MJS_UNDEFINED);
-        return;
-    }
-
-    const char* searchValue = NULL;
-    if(mjs_is_string(arg1)) {
-        searchValue = mjs_get_string(mjs, &arg1, NULL);
-    } else {
-        mjs_return(mjs, MJS_UNDEFINED);
-        return;
-    }
-
-    char* found = strstr(str, searchValue);
-    int position = found ? (int)(found - str) : -1;
-
-    mjs_return(mjs, mjs_mk_number(mjs, position));
-}
-
 static void js_string_to_upper_case(struct mjs* mjs) {
     mjs_val_t arg0 = mjs_arg(mjs, 0);
 
@@ -137,13 +44,8 @@ static void js_string_to_lower_case(struct mjs* mjs) {
     mjs_return(mjs, resultStr);
 }
 
-static void string_utils_init(struct mjs* mjs) 
-{
+static void string_utils_init(struct mjs* mjs) {
     mjs_val_t global = mjs_get_global(mjs);
-    mjs_set(mjs, global, "substring", ~0, MJS_MK_FN(js_string_substring));
-    mjs_set(mjs, global, "slice", ~0, MJS_MK_FN(js_string_slice));
-    mjs_set(mjs, global, "indexOf", ~0, MJS_MK_FN(js_string_index_of));
     mjs_set(mjs, global, "toUpperCase", ~0, MJS_MK_FN(js_string_to_upper_case));
     mjs_set(mjs, global, "toLowerCase", ~0, MJS_MK_FN(js_string_to_lower_case));
-    mjs_set(mjs, global, "GetLength", ~0, MJS_MK_FN(js_string_get_length));
 }
\ No newline at end of file