diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1aa0911bc..b9681478b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 0.5.5
+
+impl Error for JsError
+
 # 0.5.4
 
 * use owned string for DefaultAtom instantiation 
diff --git a/Cargo.toml b/Cargo.toml
index 16c3b2554..53af77f80 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "hirofa_utils"
-version = "0.5.4"
+version = "0.5.5"
 authors = ["HiRoFa <info@hirofa.com>"]
 edition = "2018"
 description = "Utils project which is depended on by several other projects"
diff --git a/src/js_utils/adapters/promises.rs b/src/js_utils/adapters/promises.rs
index a1543b2eb..2ee86d4b0 100644
--- a/src/js_utils/adapters/promises.rs
+++ b/src/js_utils/adapters/promises.rs
@@ -52,17 +52,14 @@ where
                                 Ok(val_ref) => {
                                     prom_ref
                                         .js_promise_resolve(realm, &val_ref)
-                                        .ok()
                                         .expect("prom resolution failed");
                                 }
                                 Err(err) => {
                                     let err_ref = realm
                                         .js_error_create(err.get_name(), err.get_message(), err.get_stack())
-                                        .ok()
                                         .expect("could not create str");
                                     prom_ref
                                         .js_promise_reject(realm, &err_ref)
-                                        .ok()
                                         .expect("prom rejection failed");
                                 }
                             }
@@ -71,11 +68,9 @@ where
                             // todo use error:new_error(err)
                             let err_ref = realm
                                 .js_error_create(err.get_name(), err.get_message(), err.get_stack())
-                                .ok()
                                 .expect("could not create str");
                             prom_ref
                                 .js_promise_reject(realm, &err_ref)
-                                .ok()
                                 .expect("prom rejection failed");
                         }
                     }
@@ -138,17 +133,14 @@ pub(crate) fn new_resolving_promise_async<P, R, M, T>(
                                 Ok(val_ref) => {
                                     prom_ref
                                         .js_promise_resolve(realm, &val_ref)
-                                        .ok()
                                         .expect("prom resolution failed");
                                 }
                                 Err(err) => {
                                     let err_ref = realm
                                         .js_error_create(err.get_name(), err.get_message(), err.get_stack())
-                                        .ok()
                                         .expect("could not create err");
                                     prom_ref
                                         .js_promise_reject(realm, &err_ref)
-                                        .ok()
                                         .expect("prom rejection failed");
                                 }
                             }
@@ -157,11 +149,9 @@ pub(crate) fn new_resolving_promise_async<P, R, M, T>(
                             // todo use error:new_error(err)
                             let err_ref = realm
                                 .js_error_create(err.get_name(), err.get_message(), err.get_stack())
-                                .ok()
                                 .expect("could not create str");
                             prom_ref
                                 .js_promise_reject(realm, &err_ref)
-                                .ok()
                                 .expect("prom rejection failed");
                         }
                     }
diff --git a/src/js_utils/mod.rs b/src/js_utils/mod.rs
index dba3ee418..7d5f4013b 100644
--- a/src/js_utils/mod.rs
+++ b/src/js_utils/mod.rs
@@ -13,6 +13,7 @@ pub trait ScriptPreProcessor {
     fn process(&self, script: &mut Script) -> Result<(), JsError>;
 }
 
+#[derive(Debug)]
 pub struct JsError {
     name: String,
     message: String,
@@ -48,6 +49,12 @@ impl JsError {
     }
 }
 
+impl std::error::Error for JsError {
+    fn description(&self) -> &str {
+        self.get_message()
+    }
+}
+
 impl std::fmt::Display for JsError {
     fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
         let e = format!("{}: {}\n{}", self.name, self.message, self.stack);
@@ -55,6 +62,12 @@ impl std::fmt::Display for JsError {
     }
 }
 
+impl From<Error> for JsError {
+    fn from(e: Error) -> Self {
+        JsError::new_string(format!("{}", e))
+    }
+}
+
 pub struct Script {
     path: String,
     code: String,