diff --git a/Cargo.lock b/Cargo.lock
index 42b0b0d..1c713de 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1108,6 +1108,7 @@ dependencies = [
  "libloading",
  "nix",
  "serde",
+ "serde-wasm-bindgen",
  "serde_json",
  "sysinfo",
  "tokio",
@@ -1528,6 +1529,17 @@ dependencies = [
  "serde_derive",
 ]
 
+[[package]]
+name = "serde-wasm-bindgen"
+version = "0.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8302e169f0eddcc139c70f139d19d6467353af16f9fce27e8c30158036a1e16b"
+dependencies = [
+ "js-sys",
+ "serde",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "serde_derive"
 version = "1.0.203"
diff --git a/Cargo.toml b/Cargo.toml
index 8a8b273..4fcd573 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,7 +23,7 @@ required-features = [ "os-target" ]
 we_alloc = []
 default = [ "os-target" ]
 os-target = [ "clap", "home", "nix", "sysinfo", "ciborium/default", "tracing-subscriber", "async", "tracing-subscriber/env-filter", "libloading", "ciborium-io", "tracing-core" ]
-wasm-target = [ "wasm-bindgen", "console_error_panic_hook", "wasm-bindgen-cli", "web-sys", "web-sys/Worker", "web-sys/Window", "web-sys/WorkerOptions", "web-sys/WorkerType", "we_alloc" ]
+wasm-target = [ "wasm-bindgen", "console_error_panic_hook", "wasm-bindgen-cli", "web-sys", "web-sys/Worker", "web-sys/Window", "web-sys/WorkerOptions", "web-sys/WorkerType", "serde-wasm-bindgen" ]
 async = ["tokio/net", "tokio", "tokio/rt-multi-thread", "tokio/io-util"]
 
 
@@ -48,6 +48,7 @@ wasm-bindgen = { version = "0.2.84", optional = true }
 console_error_panic_hook = { version = "0.1.7", optional = true }
 wasm-bindgen-cli = { version = "0.2.92", optional = true }
 web-sys = { version = "0.3.70", optional = true }
+serde-wasm-bindgen = { version = "0.6.5", optional = true }
 
 # os dependencies
 clap = { version = "4.4.11", features = ["cargo"], optional = true }
diff --git a/src/core/id.rs b/src/core/id.rs
index f6e9196..a60a598 100644
--- a/src/core/id.rs
+++ b/src/core/id.rs
@@ -51,6 +51,15 @@ impl MizeId {
         self.path.clone()
     }
 
+    pub fn after_store_part(&self) -> Vec<String> {
+        let tmp = self.path();
+        let mut path_iter = tmp.into_iter();
+        path_iter.next();
+        let new_path: Vec<String> = path_iter.map(|v| v.to_owned()).collect();
+
+        return new_path;
+    }
+
     pub fn namespace(&self) -> Namespace {
         self.namespace.clone()
     }
@@ -128,3 +137,46 @@ impl IntoMizeId for MizeId {
 //}
 
 
+#[cfg(test)]
+mod test {
+    use crate::instance::Instance;
+
+    use super::*;
+
+    #[test]
+    fn test_id() -> MizeResult<()> {
+        let instance = Instance::empty()?;
+
+        let id_one = instance.new_id("0/config/hi")?;
+        assert_eq!(instance.get_namespace()?, id_one.namespace());
+        assert_eq!("0", id_one.store_part());
+        assert_eq!(vec!["config".to_owned(), "hi".to_owned()], id_one.after_store_part());
+
+        let id_two = instance.new_id("test.ns:hello/config/hi")?;
+        assert_eq!(instance.namespace_from_string("test.ns".to_owned())?, id_two.namespace());
+        assert_eq!("hello", id_two.store_part());
+        assert_eq!(vec!["config".to_owned(), "hi".to_owned()], id_one.after_store_part());
+
+        let id_three = instance.new_id("0/")?;
+        assert_eq!(instance.get_namespace()?, id_three.namespace());
+        assert_eq!("0", id_three.store_part());
+        assert_eq!(Vec::<String>::new(), id_three.after_store_part());
+
+        let id_four = instance.new_id("test.ns:0/")?;
+        assert_eq!(instance.namespace_from_string("test.ns".to_owned())?, id_four.namespace());
+        assert_eq!("0", id_four.store_part());
+        assert_eq!(Vec::<String>::new(), id_four.after_store_part());
+
+        let id_fife = instance.new_id("0")?;
+        assert_eq!(instance.get_namespace()?, id_fife.namespace());
+        assert_eq!("0", id_fife.store_part());
+        assert_eq!(Vec::<String>::new(), id_fife.after_store_part());
+
+        //TODO: add the parsing form mize:// urls....
+
+
+        Ok(())
+    }
+
+
+}
diff --git a/src/core/instance/mod.rs b/src/core/instance/mod.rs
index bc867fd..f29e4c8 100644
--- a/src/core/instance/mod.rs
+++ b/src/core/instance/mod.rs
@@ -41,6 +41,9 @@ pub mod updater;
 pub mod msg_thread;
 pub mod module;
 
+#[cfg(test)]
+mod tests;
+
 static MSG_CHANNEL_SIZE: usize = 200;
 
 static BUILD_TIME_CONFIG: &str = include_str!(std::env!("MIZE_BUILD_CONFIG"));
@@ -267,7 +270,7 @@ impl Instance {
     }
 
     pub fn id_from_string(&self, string: String) -> MizeResult<MizeId> {
-        let vec_string: Vec<String> = string.split("/").map(|v| v.to_owned()).collect();
+        let vec_string: Vec<String> = string.split("/").map(|v| v.to_owned()).filter(|el| el.as_str() != "").collect();
         self.id_from_vec_string(vec_string)
     }
 
@@ -409,27 +412,6 @@ impl Instance {
             debug!("spawning thread: {}", name_to_move);
             let my_thread_id = my_thread_id_no_mutex_guard;
 
-
-            #[cfg(feature = "wasm-target")]
-            unsafe {
-// console_log macro
-use wasm_bindgen::prelude::*;
-#[wasm_bindgen]
-extern "C" {
-    #[wasm_bindgen(js_namespace = console)]
-    fn log(s: &str);
-}
-macro_rules! console_log {
-    // Note that this is using the `log` function imported above during
-    // `bare_bones`
-    ($($t:tt)*) => (log(&format_args!($($t)*).to_string()))
-}
-//end of console_log macro
-            console_log!("in other threadddddddddddddd");
-            }
-
-
-
             func()?;
 
             let mut threads_inner = thread_mutex.lock()?;
diff --git a/src/core/instance/tests.rs b/src/core/instance/tests.rs
new file mode 100644
index 0000000..ab6684e
--- /dev/null
+++ b/src/core/instance/tests.rs
@@ -0,0 +1,148 @@
+
+use tracing_subscriber::registry::Data;
+
+use crate::item::IntoItemData;
+
+use super::*;
+
+#[test]
+fn test_set_sub_path() -> MizeResult<()> {
+    let instance = Instance::empty()?;
+
+    let data = ItemData::from_toml(r#"
+        [config]
+        hi = "hello from config/hi"
+
+        [config.test]
+        inner = "inner"
+    "#)?;
+
+    let data_two = ItemData::from_toml(r#"
+        [config]
+        hi = "hello from config/hi"
+
+        [config.test]
+        inner = "new inner"
+    "#)?;
+
+    let item = instance.new_item()?;
+    instance.set_blocking(item.id(), data.clone())?;
+
+    assert_eq!(item.as_data_full()?, data);
+
+    // try to set a sub path of item
+    instance.set(vec![item.id().store_part(), "config", "test", "inner"], "hello".into_item_data())?;
+
+    // the contents of item should then be like data_two
+    assert_eq!(instance.get(vec![item.id().store_part(), "config", "test", "inner"])?.as_data_full()?, ItemData::from_string("hello"));
+    assert_eq!(item.as_data_full()?, data_two);
+
+    Ok(())
+}
+
+#[test]
+fn test_itemdata_set_path() -> MizeResult<()> {
+    let mut data = ItemData::from_toml(r#"
+        [config]
+        hi = "hello from config/hi"
+
+        [config.test]
+        inner = "inner"
+    "#)?;
+
+    let data_two = ItemData::from_toml(r#"
+        [config]
+        hi = "hello from config/hi"
+
+        [config.test]
+        inner = "new inner"
+    "#)?;
+
+    data.set_path(vec!["config", "test", "inner"], ItemData::from_string("new inner"))?;
+
+    assert_eq!(data, data_two);
+
+    Ok(())
+}
+
+#[test]
+fn test_itemdata_merge() -> MizeResult<()> {
+    let mut data = ItemData::from_toml(r#"
+        [config]
+        hi = "hello from config/hi"
+
+        [config.test]
+        inner = "inner"
+    "#)?;
+
+    let data_two = ItemData::from_toml(r#"
+        [config]
+        hi = "hello from config/hi"
+
+        [config.test]
+        inner = "new inner"
+    "#)?;
+
+    assert_eq!(data.get_path(vec!["config", "test", "inner"])?, ItemData::from_string("inner"));
+
+    data.merge(data_two.clone());
+
+    assert_eq!(data, data_two);
+
+    assert_eq!(data.get_path(vec!["config", "test", "inner"])?, ItemData::from_string("new inner"));
+
+    Ok(())
+}
+
+#[test]
+fn test_item_merge() -> MizeResult<()> {
+    let instance = Instance::empty()?;
+
+    let mut item = instance.new_item()?;
+
+    // here the item should contain "empty" data
+    assert_eq!(item.as_data_full()?, ItemData::new());
+
+    let data = ItemData::from_toml(r#"
+        [config]
+        hi = "hello from config/hi"
+
+        [config.test]
+        inner = "inner"
+    "#)?;
+
+    let data_two = ItemData::from_toml(r#"
+        [config]
+        hi = "hello from config/hi"
+
+        [config.test]
+        inner = "new inner"
+    "#)?;
+
+    item.merge(data.clone())?;
+
+    // now it should contain data
+    assert_eq!(item.as_data_full()?, data);
+
+    let mut sub_item = instance.get(vec![item.id().store_part(), "config", "test", "inner"])?;
+
+    // the sub item should have the string "inner"
+    assert_eq!(sub_item.as_data_full()?, ItemData::from_string("inner"));
+
+    sub_item.merge(ItemData::from_string("new inner"));
+
+    assert_eq!(sub_item.as_data_full()?, ItemData::from_string("new inner"));
+
+    // also the item should be updated
+    assert_eq!(item.as_data_full()?, data_two);
+
+
+    Ok(())
+}
+
+#[test]
+#[should_panic(expected = "correct panic")]
+fn test_cant_set_non_existent_item() -> () {
+    let instance = Instance::empty().expect("wrong panic");
+    instance.set_blocking("5", "hello world".into_item_data()).expect("correct panic");
+}
diff --git a/src/core/instance/updater.rs b/src/core/instance/updater.rs
index b72c549..0c040b2 100644
--- a/src/core/instance/updater.rs
+++ b/src/core/instance/updater.rs
@@ -64,8 +64,9 @@ macro_rules! console_log {
     ($($t:tt)*) => (log(&format_args!($($t)*).to_string()))
 }
 //end of console_log macro
-        console_log!("handle operation....");
+        console_log!("handle operation....: {:?}", operation);
     }
+
     match operation {
         Operation::Set(id, value, maybe_conn) => {
             let item_data: ItemData = value.to_owned();
@@ -81,7 +82,7 @@ macro_rules! console_log {
                 };
                 for sub in vec.iter_mut() {
 
-                    // don't handle sub of type connection, in case the update comes from  this
+                    // don't handle sub of type connection, in case the update comes from this
                     // connection
                     if let Some(conn) = maybe_conn {
                         if let Subscription::Connection(conn2) = sub {
diff --git a/src/core/item.rs b/src/core/item.rs
index 9e948d2..4f57ebe 100644
--- a/src/core/item.rs
+++ b/src/core/item.rs
@@ -110,6 +110,7 @@ impl Item<'_> {
     pub fn merge<V: Into<ItemData> + Debug >(&mut self, mut value: V) -> MizeResult<()> {
 
         let mut data = self.as_data_full()?;
+        //let mut data = data_full.get_path(id_path_without_store_part)?;
         trace!("item::merge data: {:?}", data);
         trace!("item::merge id: {:?}", self.id());
 
@@ -173,6 +174,10 @@ impl ItemData {
         &self.0
     }
 
+    pub fn from_cbor(cbor: CborValue) -> ItemData {
+        ItemData (cbor)
+    }
+
     pub fn null() -> CborValue {
         CborValue::Null
     }
@@ -244,6 +249,12 @@ pub fn item_data_set_path(data: &mut CborValue, path: Vec<String>, data_to_set:
     //trace!("[ {} ] path: {:?}", "ARG".yellow(), path);
     //trace!("[ {} ] data_to_set: {}", "ARG".yellow(), data_to_set.clone().into_item_data());
 
+    test_println!("###########################");
+    test_println!("data: {}", ItemData::from_cbor(data.clone()));
+    test_println!("path: {:?}", path);
+    test_println!("data_to_set: {}", ItemData::from_cbor(data_to_set.clone()));
+    test_println!("###########################");
+
     let mut path_iter = path.clone().into_iter();
     let path_el = match path_iter.nth(0) {
         Some(val) => val,
@@ -474,7 +485,7 @@ impl IntoItemData for i128 {
 
 impl fmt::Display for ItemData {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "\nItemData: ");
+        write!(f, "ItemData: ");
         let display_writer = DisplayWriter (f);
         self.0.serialize(&mut serde_json::Serializer::pretty(display_writer))
             .map_err(|serde_err| std::fmt::Error)
@@ -495,3 +506,17 @@ impl<'a, 'b> io::Write for DisplayWriter<'a, 'b> {
     fn flush(&mut self) -> std::result::Result<(), std::io::Error> { todo!() }
 }
 
+impl PartialEq for ItemData {
+    fn eq(&self, other: &Self) -> bool {
+        let mut buf: Vec<u8> = Vec::new();
+        let mut buf_other: Vec<u8> = Vec::new();
+
+        ciborium::into_writer(&self.0, &mut buf);
+        ciborium::into_writer(&other.0, &mut buf_other);
+
+        buf == buf_other
+    }
+}
+impl Eq for ItemData {}
+
+
diff --git a/src/core/memstore.rs b/src/core/memstore.rs
index c50c098..764b2de 100644
--- a/src/core/memstore.rs
+++ b/src/core/memstore.rs
@@ -12,6 +12,7 @@ use crate::error::{MizeError, MizeResult, IntoMizeResult};
 use crate::item::{Item, ItemData};
 use crate::instance::Instance;
 use crate::item::get_raw_from_cbor;
+use crate::mize_err;
 
 #[derive(Clone, Debug)]
 pub struct MemStore {
@@ -30,7 +31,18 @@ impl Store for MemStore {
     fn set(&self, id: MizeId, data: ItemData) -> MizeResult<()> {
         let mut inner = self.inner.lock()?;
 
-        inner.map.insert(id_to_u64(id)?, data);
+        if let Some(old_data) = inner.map.get(&id_to_u64(id.clone())?) {
+            //if there is already data there, set at the correct path
+            let mut old_data = old_data.to_owned();
+            let path = id.after_store_part();
+            old_data.set_path(path, data)?;
+            inner.map.insert(id_to_u64(id)?, old_data);
+
+        } else {
+            // if no data exists for that store_part, just insert
+            inner.map.insert(id_to_u64(id)?, data);
+        }
+
         return Ok(())
     }
     fn get_links(&self, item: Item) -> MizeResult<Vec<MizeId>> {
@@ -76,12 +88,32 @@ impl Store for MemStore {
             None => ItemData::new(),
         };
 
-        let tmp = id.path();
-        let mut path_iter = tmp.into_iter();
-        path_iter.next();
-        let new_path: Vec<String> = path_iter.map(|v| v.to_owned()).collect();
+        let new_path = id.after_store_part();
         let ret_data = data.get_path(new_path)?;
 
+
+
+    #[cfg(feature = "wasm-target")]
+    unsafe {
+// console_log macro
+use wasm_bindgen::prelude::*;
+#[wasm_bindgen]
+extern "C" {
+    #[wasm_bindgen(js_namespace = console)]
+    fn log(s: &str);
+}
+macro_rules! console_log {
+    // Note that this is using the `log` function imported above during
+    // `bare_bones`
+    ($($t:tt)*) => (log(&format_args!($($t)*).to_string()))
+}
+//end of console_log macro
+        console_log!("ret_data in data full in memstore: {:?}", ret_data);
+    }
+
+
+
+
         return Ok(ret_data);
     }
     fn id_iter(&self) -> MizeResult<IdIter> {
diff --git a/src/lib.rs b/src/lib.rs
index 8d6fc3d..6013a3e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,12 +1,34 @@
 
 #![ allow( warnings ) ]
 
-#[no_mangle]
-pub fn main() {
-    println!("hello from main fn");
+static PROTO_VERSION: u8 = 1;
+
+#[macro_export]
+macro_rules! test_println {
+    ($($arg:tt)*) => { 
+
+        #[cfg(test)]
+        print!("[[ {} ]] ", <&str as colored::Colorize>::blue("TEST"));
+
+        #[cfg(test)]
+        print!($($arg)*);
+
+        #[cfg(test)]
+        print!("\n");
+    };
 }
 
-static PROTO_VERSION: u8 = 1;
+#[macro_export]
+macro_rules! test_print {
+    ($($arg:tt)*) => { 
+
+        #[cfg(test)]
+        print!("[[ {} ]] ", <&str as colored::Colorize>::blue("TEST"));
+
+        #[cfg(test)]
+        print!($($arg)*);
+    };
+}
 
 // the core part has the code that can run on any platform
 mod core {
diff --git a/src/platform/wasm/mod.rs b/src/platform/wasm/mod.rs
index 948d439..9e731fb 100644
--- a/src/platform/wasm/mod.rs
+++ b/src/platform/wasm/mod.rs
@@ -1,6 +1,8 @@
 use std::ptr::NonNull;
 use std::panic;
 use web_sys::js_sys;
+use crate::id::MizeId;
+use crate::item::Item;
 use crate::platform::wasm::js_sys::Function;
 use web_sys::{WorkerOptions, WorkerType};
 use web_sys::Worker;
@@ -37,6 +39,8 @@ static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
 // A function imitating `std::thread::spawn`.
 // thanks to: https://www.tweag.io/blog/2022-11-24-wasm-threads-and-messages/
 pub fn wasm_spawn(f: impl FnOnce() -> MizeResult<()> + Send + 'static) -> MizeResult<()> {
+    console_log!("no threading in the browser.....");
+    return Ok(());
 
     // to get window.mize_worker_url, which is set by some js code, which gets "compiled" by a
     // bundler, which sets window.mize_worker_url to the url of ./npm_pkg/worker.js
@@ -118,13 +122,13 @@ pub struct JsInstance {
     inner: NonNull<Instance>,
 }
 
-/*
+
 #[wasm_bindgen]
-pub struct JsModule {
-    inner: NonNull<Box<dyn Module + Send + Sync>>,
-    //inner: *mut Mme,
+pub struct JsItemHandle {
+    instance: NonNull<Instance>,
+    id: MizeId,
 }
-*/
+
 
 #[wasm_bindgen]
 impl JsInstance {
@@ -144,11 +148,44 @@ impl JsInstance {
     }
 
     #[wasm_bindgen]
-    pub unsafe fn test(&mut self) -> () {
-        console_log!("hiiiiiiiiiiiiiiii from test");
-        self.inner.as_mut().set("0/config/hello", "hello world".into_item_data());
+    pub unsafe fn set(&mut self, id: String, value: String) -> () {
+        let data = value.into_item_data();
+        console_log!("data in set: {}", data);
+        self.inner.as_mut().set_blocking(id, data);
     }
 
-    //#[wasm_bindgen]
+    #[wasm_bindgen]
+    pub unsafe fn get_handle(&mut self, id: String) -> MizeResult<JsItemHandle> {
+        let item = self.inner.as_mut().get(id)?;
+        Ok(JsItemHandle { instance: self.inner, id: item.id()})
+    }
+}
+
+
+#[wasm_bindgen]
+impl JsItemHandle {
+
+    #[wasm_bindgen]
+    pub unsafe fn value_string(&mut self) -> MizeResult<String> {
+        let item = self.instance.as_mut().get(self.id.clone())?;
+        let string = item.value_string()?;
+        Ok(string)
+    }
+
+    #[wasm_bindgen]
+    pub unsafe fn as_data_full(&mut self) -> MizeResult<JsValue> {
+        let item = self.instance.as_mut().get(self.id.clone())?;
+        let data_raw = item.as_data_full()?;
+        let jsvalue = serde_wasm_bindgen::to_value(data_raw.cbor())?;
+        Ok(jsvalue)
+    }
 
 }
+
+
+impl From<MizeError> for JsValue {
+    fn from(value: MizeError) -> Self {
+        let string = format!("{:?}", value);
+        string.into()
+    }
+}