diff --git a/Userland/Services/WebDriver/Client.cpp b/Userland/Services/WebDriver/Client.cpp
index c0c503f99e..f27b35531b 100644
--- a/Userland/Services/WebDriver/Client.cpp
+++ b/Userland/Services/WebDriver/Client.cpp
@@ -249,7 +249,7 @@ ErrorOr<Client::RoutingResult, WebDriverError> Client::match_route(HTTP::HttpReq
 
     // https://w3c.github.io/webdriver/webdriver-spec.html#routing-requests
     if (!resource.starts_with(m_prefix))
-        return WebDriverError { 404, "unknown command", "The resource doesn't start with the prefix." };
+        return WebDriverError::from_code(ErrorCode::UnknownCommand, "The resource doesn't start with the prefix.");
 
     Vector<StringView> resource_split = resource.substring_view(m_prefix.length()).split_view('/', true);
     Vector<StringView> parameters;
@@ -288,25 +288,25 @@ ErrorOr<Client::RoutingResult, WebDriverError> Client::match_route(HTTP::HttpReq
     // Matched a path, but didn't match a known method
     if (matched_path) {
         dbgln_if(WEBDRIVER_DEBUG, "- A path matched, but method didn't. :^(");
-        return WebDriverError { 405, "unknown method", "The command matched a known URL but did not match a method for that URL." };
+        return WebDriverError::from_code(ErrorCode::UnknownMethod, "The command matched a known URL but did not match a method for that URL.");
     }
 
     // Didn't have any match
     dbgln_if(WEBDRIVER_DEBUG, "- No matches. :^(");
-    return WebDriverError { 404, "unknown command", "The command was not recognized." };
+    return WebDriverError::from_code(ErrorCode::UnknownCommand, "The command was not recognized.");
 }
 
 ErrorOr<Session*, WebDriverError> Client::find_session_with_id(StringView session_id)
 {
     auto session_id_or_error = session_id.to_uint<>();
     if (!session_id_or_error.has_value())
-        return WebDriverError { 404, "invalid session id", "Invalid session id" };
+        return WebDriverError::from_code(ErrorCode::InvalidSessionId, "Invalid session id");
 
     for (auto& session : Client::s_sessions) {
         if (session.session_id() == session_id_or_error.value())
             return &session;
     }
-    return WebDriverError { 404, "invalid session id", "Invalid session id" };
+    return WebDriverError::from_code(ErrorCode::InvalidSessionId, "Invalid session id");
 }
 
 void Client::close_session(unsigned session_id)
@@ -360,7 +360,7 @@ ErrorOr<JsonValue, WebDriverError> Client::handle_new_session(Vector<StringView>
     NonnullOwnPtr<Session> session = make<Session>(session_id, *this);
     auto start_result = session->start();
     if (start_result.is_error()) {
-        return WebDriverError { 500, "Failed to start session", start_result.error().string_literal() };
+        return WebDriverError::from_code(ErrorCode::SessionNotCreated, String::formatted("Failed to start session: {}", start_result.error().string_literal()));
     }
 
     // FIXME: 8. Set the current session to session.
@@ -404,9 +404,8 @@ ErrorOr<JsonValue, WebDriverError> Client::handle_delete_session(Vector<StringVi
     auto* session = TRY(find_session_with_id(parameters[0]));
 
     auto stop_result = session->stop();
-    if (stop_result.is_error()) {
-        return WebDriverError { 500, "unsupported operation", stop_result.error().string_literal() };
-    }
+    if (stop_result.is_error())
+        return WebDriverError::from_code(ErrorCode::UnsupportedOperation, stop_result.error().string_literal());
 
     // 2. Return success with data null.
     return make_json_value(JsonValue());
diff --git a/Userland/Services/WebDriver/Client.h b/Userland/Services/WebDriver/Client.h
index e35dc5cf24..b44b3ff474 100644
--- a/Userland/Services/WebDriver/Client.h
+++ b/Userland/Services/WebDriver/Client.h
@@ -84,7 +84,7 @@ private:
             Variant<WebDriverError, Error> error = result.release_error();
             if (error.has<WebDriverError>())
                 return error.get<WebDriverError>();
-            return WebDriverError { 500, "unsupported operation", error.get<Error>().string_literal() };
+            return WebDriverError::from_code(ErrorCode::UnsupportedOperation, error.get<Error>().string_literal());
         }
 
         return result.release_value();
@@ -95,7 +95,7 @@ private:
             Variant<WebDriverError, Error> error = result.release_error();
             if (error.has<WebDriverError>())
                 return error.get<WebDriverError>();
-            return WebDriverError { 500, "unsupported operation", error.get<Error>().string_literal() };
+            return WebDriverError::from_code(ErrorCode::UnsupportedOperation, error.get<Error>().string_literal());
         }
         return {};
     }
diff --git a/Userland/Services/WebDriver/Session.cpp b/Userland/Services/WebDriver/Session.cpp
index 80b71d9b13..b59edae1de 100644
--- a/Userland/Services/WebDriver/Session.cpp
+++ b/Userland/Services/WebDriver/Session.cpp
@@ -102,13 +102,13 @@ ErrorOr<JsonValue, WebDriverError> Session::navigate_to(JsonValue const& payload
     // 1. If the current top-level browsing context is no longer open, return error with error code no such window.
     auto current_window = this->current_window();
     if (!current_window.has_value())
-        return WebDriverError { 404, "no such window", "Window not found" };
+        return WebDriverError::from_code(ErrorCode::NoSuchWindow, "Window not found");
 
     // FIXME 2. Handle any user prompts and return its value if it is an error.
 
     // 3. If the url property is missing from the parameters argument or it is not a string, return error with error code invalid argument.
     if (!payload.is_object() || !payload.as_object().has_string("url"sv)) {
-        return WebDriverError { 400, "invalid argument", "Payload doesn't have a string url" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Payload doesn't have a string url");
     }
 
     // 4. Let url be the result of getting a property named url from the parameters argument.
@@ -138,7 +138,7 @@ ErrorOr<JsonValue, WebDriverError> Session::get_current_url()
     // 1. If the current top-level browsing context is no longer open, return error with error code no such window.
     auto current_window = this->current_window();
     if (!current_window.has_value())
-        return WebDriverError { 404, "no such window", "Window not found" };
+        return WebDriverError::from_code(ErrorCode::NoSuchWindow, "Window not found");
 
     // FIXME: 2. Handle any user prompts and return its value if it is an error.
 
@@ -155,7 +155,7 @@ ErrorOr<JsonValue, WebDriverError> Session::back()
     // 1. If the current top-level browsing context is no longer open, return error with error code no such window.
     auto current_window = this->current_window();
     if (!current_window.has_value())
-        return WebDriverError { 404, "no such window", "Window not found" };
+        return WebDriverError::from_code(ErrorCode::NoSuchWindow, "Window not found");
 
     // FIXME: 2. Handle any user prompts and return its value if it is an error.
 
@@ -178,7 +178,7 @@ ErrorOr<JsonValue, WebDriverError> Session::forward()
     // 1. If the current top-level browsing context is no longer open, return error with error code no such window.
     auto current_window = this->current_window();
     if (!current_window.has_value())
-        return WebDriverError { 404, "no such window", "Window not found" };
+        return WebDriverError::from_code(ErrorCode::NoSuchWindow, "Window not found");
 
     // FIXME: 2. Handle any user prompts and return its value if it is an error.
 
@@ -201,7 +201,7 @@ ErrorOr<JsonValue, WebDriverError> Session::refresh()
     // 1. If the current top-level browsing context is no longer open, return error with error code no such window.
     auto current_window = this->current_window();
     if (!current_window.has_value())
-        return WebDriverError { 404, "no such window", "Window not found" };
+        return WebDriverError::from_code(ErrorCode::NoSuchWindow, "Window not found");
 
     // FIXME: 2. Handle any user prompts and return its value if it is an error.
 
@@ -226,7 +226,7 @@ ErrorOr<JsonValue, WebDriverError> Session::get_title()
     // 1. If the current top-level browsing context is no longer open, return error with error code no such window.
     auto current_window = this->current_window();
     if (!current_window.has_value())
-        return WebDriverError { 404, "no such window", "Window not found" };
+        return WebDriverError::from_code(ErrorCode::NoSuchWindow, "Window not found");
 
     // FIXME: 2. Handle any user prompts and return its value if it is an error.
 
@@ -241,7 +241,7 @@ ErrorOr<JsonValue, WebDriverError> Session::get_window_handle()
     // 1. If the current top-level browsing context is no longer open, return error with error code no such window.
     auto current_window = this->current_window();
     if (!current_window.has_value())
-        return WebDriverError { 404, "no such window", "Window not found" };
+        return WebDriverError::from_code(ErrorCode::NoSuchWindow, "Window not found");
 
     // 2. Return success with data being the window handle associated with the current top-level browsing context.
     return m_current_window_handle;
@@ -253,7 +253,7 @@ ErrorOr<void, Variant<WebDriverError, Error>> Session::close_window()
     // 1. If the current top-level browsing context is no longer open, return error with error code no such window.
     auto current_window = this->current_window();
     if (!current_window.has_value())
-        return Variant<WebDriverError, Error>(WebDriverError { 404, "no such window", "Window not found" });
+        return Variant<WebDriverError, Error>(WebDriverError::from_code(ErrorCode::NoSuchWindow, "Window not found"));
 
     // 2. Close the current top-level browsing context.
     m_windows.remove(m_current_window_handle);
@@ -326,13 +326,13 @@ ErrorOr<JsonArray, WebDriverError> Session::find(Session::LocalElement const& st
     // 4. Let elements returned be the result of trying to call the relevant element location strategy with arguments start node, and selector.
     auto location_strategy_handler = s_locator_strategies.first_matching([&](LocatorStrategy const& match) { return match.name == location_strategy; });
     if (!location_strategy_handler.has_value())
-        return WebDriverError { 400, "invalid argument", "No valid location strategy" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "No valid location strategy");
 
     auto elements_or_error = (this->*location_strategy_handler.value().handler)(start_node, selector);
 
     // 5. If a DOMException, SyntaxError, XPathException, or other error occurs during the execution of the element location strategy, return error invalid selector.
     if (elements_or_error.is_error())
-        return WebDriverError { 400, "invalid selector", String::formatted("The location strategy could not finish: {}", elements_or_error.release_error().message) };
+        return WebDriverError::from_code(ErrorCode::InvalidSelector, String::formatted("The location strategy could not finish: {}", elements_or_error.release_error().message));
 
     auto elements = elements_or_error.release_value();
 
@@ -368,7 +368,7 @@ ErrorOr<Vector<Session::LocalElement>, WebDriverError> Session::locator_strategy
     auto elements_ids = m_browser_connection->query_selector_all(start_node.id, selector);
 
     if (!elements_ids.has_value())
-        return WebDriverError { 400, "invalid selector", "query_selector_all returned failed!" };
+        return WebDriverError::from_code(ErrorCode::InvalidSelector, "query_selector_all returned failed!");
 
     Vector<Session::LocalElement> elements;
     for (auto id : elements_ids.release_value()) {
@@ -383,64 +383,64 @@ ErrorOr<Vector<Session::LocalElement>, WebDriverError> Session::locator_strategy
 ErrorOr<Vector<Session::LocalElement>, WebDriverError> Session::locator_strategy_link_text(Session::LocalElement const&, StringView const&)
 {
     // FIXME: Implement
-    return WebDriverError { 501, "not implemented", "locator strategy link text" };
+    return WebDriverError::from_code(ErrorCode::UnsupportedOperation, "Not implemented: locator strategy link text");
 }
 
 // https://w3c.github.io/webdriver/#partial-link-text
 ErrorOr<Vector<Session::LocalElement>, WebDriverError> Session::locator_strategy_partial_link_text(Session::LocalElement const&, StringView const&)
 {
     // FIXME: Implement
-    return WebDriverError { 501, "not implemented", "locator strategy partial link text" };
+    return WebDriverError::from_code(ErrorCode::UnsupportedOperation, "Not implemented: locator strategy partial link text");
 }
 
 // https://w3c.github.io/webdriver/#tag-name
 ErrorOr<Vector<Session::LocalElement>, WebDriverError> Session::locator_strategy_tag_name(Session::LocalElement const&, StringView const&)
 {
     // FIXME: Implement
-    return WebDriverError { 501, "not implemented", "locator strategy tag name" };
+    return WebDriverError::from_code(ErrorCode::UnsupportedOperation, "Not implemented: locator strategy tag name");
 }
 
 // https://w3c.github.io/webdriver/#xpath
 ErrorOr<Vector<Session::LocalElement>, WebDriverError> Session::locator_strategy_x_path(Session::LocalElement const&, StringView const&)
 {
     // FIXME: Implement
-    return WebDriverError { 501, "not implemented", "locator strategy XPath" };
+    return WebDriverError::from_code(ErrorCode::UnsupportedOperation, "Not implemented: locator strategy XPath");
 }
 
 // 12.3.2 Find Element, https://w3c.github.io/webdriver/#dfn-find-element
 ErrorOr<JsonValue, WebDriverError> Session::find_element(JsonValue const& payload)
 {
     if (!payload.is_object())
-        return WebDriverError { 400, "invalid argument", "Payload is not a JSON object" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Payload is not a JSON object");
 
     auto const& properties = payload.as_object();
     // 1. Let location strategy be the result of getting a property called "using".
     if (!properties.has("using"sv))
-        return WebDriverError { 400, "invalid argument", "No property called 'using' present" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "No property called 'using' present");
     auto const& maybe_location_strategy = properties.get("using"sv);
     if (!maybe_location_strategy.is_string())
-        return WebDriverError { 400, "invalid argument", "Property 'using' is not a String" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Property 'using' is not a String");
 
     auto location_strategy = maybe_location_strategy.to_string();
 
     // 2. If location strategy is not present as a keyword in the table of location strategies, return error with error code invalid argument.
     if (!s_locator_strategies.first_matching([&](LocatorStrategy const& match) { return match.name == location_strategy; }).has_value())
-        return WebDriverError { 400, "invalid argument", "No valid location strategy" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "No valid location strategy");
 
     // 3. Let selector be the result of getting a property called "value".
     // 4. If selector is undefined, return error with error code invalid argument.
     if (!properties.has("value"sv))
-        return WebDriverError { 400, "invalid argument", "No property called 'value' present" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "No property called 'value' present");
     auto const& maybe_selector = properties.get("value"sv);
     if (!maybe_selector.is_string())
-        return WebDriverError { 400, "invalid argument", "Property 'value' is not a String" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Property 'value' is not a String");
 
     auto selector = maybe_selector.to_string();
 
     // 5. If the current browsing context is no longer open, return error with error code no such window.
     auto current_window = this->current_window();
     if (!current_window.has_value())
-        return WebDriverError { 404, "no such window", "Window not found" };
+        return WebDriverError::from_code(ErrorCode::NoSuchWindow, "Window not found");
 
     // FIXME: 6. Handle any user prompts and return its value if it is an error.
 
@@ -449,7 +449,7 @@ ErrorOr<JsonValue, WebDriverError> Session::find_element(JsonValue const& payloa
 
     // 8. If start node is null, return error with error code no such element.
     if (!maybe_start_node_id.has_value())
-        return WebDriverError { 404, "no such element", "document element does not exist" };
+        return WebDriverError::from_code(ErrorCode::NoSuchElement, "document element does not exist");
 
     auto start_node_id = maybe_start_node_id.release_value();
     LocalElement start_node = { start_node_id };
@@ -459,7 +459,7 @@ ErrorOr<JsonValue, WebDriverError> Session::find_element(JsonValue const& payloa
 
     // 10. If result is empty, return error with error code no such element. Otherwise, return the first element of result.
     if (result.is_empty())
-        return WebDriverError { 404, "no such element", "the requested element does not exist" };
+        return WebDriverError::from_code(ErrorCode::NoSuchElement, "The requested element does not exist");
 
     return JsonValue(result.at(0));
 }
@@ -468,36 +468,36 @@ ErrorOr<JsonValue, WebDriverError> Session::find_element(JsonValue const& payloa
 ErrorOr<JsonValue, WebDriverError> Session::find_elements(JsonValue const& payload)
 {
     if (!payload.is_object())
-        return WebDriverError { 400, "invalid argument", "Payload is not a JSON object" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Payload is not a JSON object");
 
     auto const& properties = payload.as_object();
     // 1. Let location strategy be the result of getting a property called "using".
     if (!properties.has("using"sv))
-        return WebDriverError { 400, "invalid argument", "No property called 'using' present" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "No property called 'using' present");
     auto const& maybe_location_strategy = properties.get("using"sv);
     if (!maybe_location_strategy.is_string())
-        return WebDriverError { 400, "invalid argument", "Property 'using' is not a String" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Property 'using' is not a String");
 
     auto location_strategy = maybe_location_strategy.to_string();
 
     // 2. If location strategy is not present as a keyword in the table of location strategies, return error with error code invalid argument.
     if (!s_locator_strategies.first_matching([&](LocatorStrategy const& match) { return match.name == location_strategy; }).has_value())
-        return WebDriverError { 400, "invalid argument", "No valid location strategy" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "No valid location strategy");
 
     // 3. Let selector be the result of getting a property called "value".
     // 4. If selector is undefined, return error with error code invalid argument.
     if (!properties.has("value"sv))
-        return WebDriverError { 400, "invalid argument", "No property called 'value' present" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "No property called 'value' present");
     auto const& maybe_selector = properties.get("value"sv);
     if (!maybe_selector.is_string())
-        return WebDriverError { 400, "invalid argument", "Property 'value' is not a String" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Property 'value' is not a String");
 
     auto selector = maybe_selector.to_string();
 
     // 5. If the current browsing context is no longer open, return error with error code no such window.
     auto current_window = this->current_window();
     if (!current_window.has_value())
-        return WebDriverError { 404, "no such window", "Window not found" };
+        return WebDriverError::from_code(ErrorCode::NoSuchWindow, "Window not found");
 
     // FIXME: 6. Handle any user prompts and return its value if it is an error.
 
@@ -506,7 +506,7 @@ ErrorOr<JsonValue, WebDriverError> Session::find_elements(JsonValue const& paylo
 
     // 8. If start node is null, return error with error code no such element.
     if (!maybe_start_node_id.has_value())
-        return WebDriverError { 404, "no such element", "document element does not exist" };
+        return WebDriverError::from_code(ErrorCode::NoSuchElement, "document element does not exist");
 
     auto start_node_id = maybe_start_node_id.release_value();
     LocalElement start_node = { start_node_id };
@@ -520,36 +520,36 @@ ErrorOr<JsonValue, WebDriverError> Session::find_elements(JsonValue const& paylo
 ErrorOr<JsonValue, WebDriverError> Session::find_element_from_element(JsonValue const& payload, StringView parameter_element_id)
 {
     if (!payload.is_object())
-        return WebDriverError { 400, "invalid argument", "Payload is not a JSON object" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Payload is not a JSON object");
 
     auto const& properties = payload.as_object();
     // 1. Let location strategy be the result of getting a property called "using".
     if (!properties.has("using"sv))
-        return WebDriverError { 400, "invalid argument", "No property called 'using' present" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "No property called 'using' present");
     auto const& maybe_location_strategy = properties.get("using"sv);
     if (!maybe_location_strategy.is_string())
-        return WebDriverError { 400, "invalid argument", "Property 'using' is not a String" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Property 'using' is not a String");
 
     auto location_strategy = maybe_location_strategy.to_string();
 
     // 2. If location strategy is not present as a keyword in the table of location strategies, return error with error code invalid argument.
     if (!s_locator_strategies.first_matching([&](LocatorStrategy const& match) { return match.name == location_strategy; }).has_value())
-        return WebDriverError { 400, "invalid argument", "No valid location strategy" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "No valid location strategy");
 
     // 3. Let selector be the result of getting a property called "value".
     // 4. If selector is undefined, return error with error code invalid argument.
     if (!properties.has("value"sv))
-        return WebDriverError { 400, "invalid argument", "No property called 'value' present" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "No property called 'value' present");
     auto const& maybe_selector = properties.get("value"sv);
     if (!maybe_selector.is_string())
-        return WebDriverError { 400, "invalid argument", "Property 'value' is not a String" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Property 'value' is not a String");
 
     auto selector = maybe_selector.to_string();
 
     // 5. If the current browsing context is no longer open, return error with error code no such window.
     auto current_window = this->current_window();
     if (!current_window.has_value())
-        return WebDriverError { 404, "no such window", "Window not found" };
+        return WebDriverError::from_code(ErrorCode::NoSuchWindow, "Window not found");
 
     // FIXME: 6. Handle any user prompts and return its value if it is an error.
 
@@ -559,7 +559,7 @@ ErrorOr<JsonValue, WebDriverError> Session::find_element_from_element(JsonValue
 
     auto maybe_element_id = parameter_element_id.to_int();
     if (!maybe_element_id.has_value())
-        return WebDriverError { 400, "invalid argument", "Element ID is not an i32" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Element ID is not an i32");
 
     auto element_id = maybe_element_id.release_value();
     LocalElement start_node = { element_id };
@@ -569,7 +569,7 @@ ErrorOr<JsonValue, WebDriverError> Session::find_element_from_element(JsonValue
 
     // 9. If result is empty, return error with error code no such element. Otherwise, return the first element of result.
     if (result.is_empty())
-        return WebDriverError { 404, "no such element", "the requested element does not exist" };
+        return WebDriverError::from_code(ErrorCode::NoSuchElement, "The requested element does not exist");
 
     return JsonValue(result.at(0));
 }
@@ -578,36 +578,36 @@ ErrorOr<JsonValue, WebDriverError> Session::find_element_from_element(JsonValue
 ErrorOr<JsonValue, WebDriverError> Session::find_elements_from_element(JsonValue const& payload, StringView parameter_element_id)
 {
     if (!payload.is_object())
-        return WebDriverError { 400, "invalid argument", "Payload is not a JSON object" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Payload is not a JSON object");
 
     auto const& properties = payload.as_object();
     // 1. Let location strategy be the result of getting a property called "using".
     if (!properties.has("using"sv))
-        return WebDriverError { 400, "invalid argument", "No property called 'using' present" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "No property called 'using' present");
     auto const& maybe_location_strategy = properties.get("using"sv);
     if (!maybe_location_strategy.is_string())
-        return WebDriverError { 400, "invalid argument", "Property 'using' is not a String" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Property 'using' is not a String");
 
     auto location_strategy = maybe_location_strategy.to_string();
 
     // 2. If location strategy is not present as a keyword in the table of location strategies, return error with error code invalid argument.
     if (!s_locator_strategies.first_matching([&](LocatorStrategy const& match) { return match.name == location_strategy; }).has_value())
-        return WebDriverError { 400, "invalid argument", "No valid location strategy" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "No valid location strategy");
 
     // 3. Let selector be the result of getting a property called "value".
     // 4. If selector is undefined, return error with error code invalid argument.
     if (!properties.has("value"sv))
-        return WebDriverError { 400, "invalid argument", "No property called 'value' present" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "No property called 'value' present");
     auto const& maybe_selector = properties.get("value"sv);
     if (!maybe_selector.is_string())
-        return WebDriverError { 400, "invalid argument", "Property 'value' is not a String" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Property 'value' is not a String");
 
     auto selector = maybe_selector.to_string();
 
     // 5. If the current browsing context is no longer open, return error with error code no such window.
     auto current_window = this->current_window();
     if (!current_window.has_value())
-        return WebDriverError { 404, "no such window", "Window not found" };
+        return WebDriverError::from_code(ErrorCode::NoSuchWindow, "Window not found");
 
     // FIXME: 6. Handle any user prompts and return its value if it is an error.
 
@@ -617,7 +617,7 @@ ErrorOr<JsonValue, WebDriverError> Session::find_elements_from_element(JsonValue
 
     auto maybe_element_id = parameter_element_id.to_int();
     if (!maybe_element_id.has_value())
-        return WebDriverError { 400, "invalid argument", "Element ID is not an i32" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Element ID is not an i32");
 
     auto element_id = maybe_element_id.release_value();
     LocalElement start_node = { element_id };
@@ -633,7 +633,7 @@ ErrorOr<JsonValue, WebDriverError> Session::get_element_attribute(JsonValue cons
     // 1. If the current browsing context is no longer open, return error with error code no such window.
     auto current_window = this->current_window();
     if (!current_window.has_value())
-        return WebDriverError { 404, "no such window", "Window not found" };
+        return WebDriverError::from_code(ErrorCode::NoSuchWindow, "Window not found");
 
     // FIXME: 2. Handle any user prompts and return its value if it is an error.
 
@@ -642,7 +642,7 @@ ErrorOr<JsonValue, WebDriverError> Session::get_element_attribute(JsonValue cons
     //       For now the element is only represented by its ID
     auto maybe_element_id = parameter_element_id.to_int();
     if (!maybe_element_id.has_value())
-        return WebDriverError { 400, "invalid argument", "Element ID is not an i32" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Element ID is not an i32");
 
     auto element_id = maybe_element_id.release_value();
 
@@ -669,7 +669,7 @@ ErrorOr<JsonValue, WebDriverError> Session::get_element_property(JsonValue const
     // 1. If the current browsing context is no longer open, return error with error code no such window.
     auto current_window = this->current_window();
     if (!current_window.has_value())
-        return WebDriverError { 404, "no such window", "Window not found" };
+        return WebDriverError::from_code(ErrorCode::NoSuchWindow, "Window not found");
 
     // FIXME: 2. Handle any user prompts and return its value if it is an error.
 
@@ -678,7 +678,7 @@ ErrorOr<JsonValue, WebDriverError> Session::get_element_property(JsonValue const
     //       For now the element is only represented by its ID
     auto maybe_element_id = parameter_element_id.to_int();
     if (!maybe_element_id.has_value())
-        return WebDriverError { 400, "invalid argument", "Element ID is not an i32" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Element ID is not an i32");
 
     auto element_id = maybe_element_id.release_value();
 
@@ -708,7 +708,7 @@ ErrorOr<JsonValue, WebDriverError> Session::get_element_css_value(JsonValue cons
     //       For now the element is only represented by its ID
     auto maybe_element_id = parameter_element_id.to_int();
     if (!maybe_element_id.has_value())
-        return WebDriverError { 400, "invalid argument", "Element ID is not an i32" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Element ID is not an i32");
 
     auto element_id = maybe_element_id.release_value();
 
@@ -749,7 +749,7 @@ ErrorOr<JsonValue, WebDriverError> Session::get_all_cookies()
     // 1. If the current browsing context is no longer open, return error with error code no such window.
     auto current_window = this->current_window();
     if (!current_window.has_value())
-        return WebDriverError { 404, "no such window", "Window not found" };
+        return WebDriverError::from_code(ErrorCode::NoSuchWindow, "Window not found");
 
     // FIXME: 2. Handle any user prompts, and return its value if it is an error.
 
@@ -775,7 +775,7 @@ ErrorOr<JsonValue, WebDriverError> Session::get_named_cookie(String const& name)
     // 1. If the current browsing context is no longer open, return error with error code no such window.
     auto current_window = this->current_window();
     if (!current_window.has_value())
-        return WebDriverError { 404, "no such window", "Window not found" };
+        return WebDriverError::from_code(ErrorCode::NoSuchWindow, "Window not found");
 
     // FIXME: 2. Handle any user prompts, and return its value if it is an error.
 
@@ -789,7 +789,7 @@ ErrorOr<JsonValue, WebDriverError> Session::get_named_cookie(String const& name)
     }
 
     // 4. Otherwise, return error with error code no such cookie.
-    return WebDriverError { 404, "no such cookie", "Cookie not found" };
+    return WebDriverError::from_code(ErrorCode::NoSuchCookie, "Cookie not found");
 }
 
 // 14.3 Add Cookie, https://w3c.github.io/webdriver/#dfn-adding-a-cookie
@@ -797,7 +797,7 @@ ErrorOr<JsonValue, WebDriverError> Session::add_cookie(JsonValue const& payload)
 {
     // 1. Let data be the result of getting a property named cookie from the parameters argument.
     if (!payload.is_object() || !payload.as_object().has_object("cookie"sv))
-        return WebDriverError { 400, "invalid argument", "Payload doesn't have a cookie object" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Payload doesn't have a cookie object");
 
     auto const& maybe_data = payload.as_object().get("cookie"sv);
 
@@ -805,17 +805,17 @@ ErrorOr<JsonValue, WebDriverError> Session::add_cookie(JsonValue const& payload)
     //    return error with error code invalid argument.
     // NOTE: Table is here: https://w3c.github.io/webdriver/#dfn-table-for-cookie-conversion
     if (!maybe_data.is_object())
-        return WebDriverError { 400, "invalid argument", "Value \"cookie\' is not an object" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Value \"cookie\' is not an object");
 
     auto const& data = maybe_data.as_object();
 
     if (!data.has("name"sv) || !data.has("value"sv))
-        return WebDriverError { 400, "invalid argument", "Cookie-Object doesn't contain all required keys" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Cookie-Object doesn't contain all required keys");
 
     // 3. If the current browsing context is no longer open, return error with error code no such window.
     auto current_window = this->current_window();
     if (!current_window.has_value())
-        return WebDriverError { 404, "no such window", "Window not found" };
+        return WebDriverError::from_code(ErrorCode::NoSuchWindow, "Window not found");
 
     // FIXME: 4. Handle any user prompts, and return its value if it is an error.
 
@@ -828,17 +828,17 @@ ErrorOr<JsonValue, WebDriverError> Session::add_cookie(JsonValue const& payload)
     //    or cookie expiry time is not an integer type, or it less than 0 or greater than the maximum safe integer,
     //    return error with error code invalid argument.
     if (data.get("name"sv).is_null() || data.get("value"sv).is_null())
-        return WebDriverError { 400, "invalid argument", "Cookie-Object is malformed: name or value are null" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Cookie-Object is malformed: name or value are null");
     if (data.has("secure"sv) && !data.get("secure"sv).is_bool())
-        return WebDriverError { 400, "invalid argument", "Cookie-Object is malformed: secure is not bool" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Cookie-Object is malformed: secure is not bool");
     if (data.has("httpOnly"sv) && !data.get("httpOnly"sv).is_bool())
-        return WebDriverError { 400, "invalid argument", "Cookie-Object is malformed: httpOnly is not bool" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Cookie-Object is malformed: httpOnly is not bool");
     Optional<Core::DateTime> expiry_time;
     if (data.has("expiry"sv)) {
         auto expiry_argument = data.get("expiry"sv);
         if (!expiry_argument.is_u32()) {
             // NOTE: less than 0 or greater than safe integer are handled by the JSON parser
-            return WebDriverError { 400, "invalid argument", "Cookie-Object is malformed: expiry is not u32" };
+            return WebDriverError::from_code(ErrorCode::InvalidArgument, "Cookie-Object is malformed: expiry is not u32");
         }
         expiry_time = Core::DateTime::from_timestamp(expiry_argument.as_u32());
     }
@@ -850,12 +850,12 @@ ErrorOr<JsonValue, WebDriverError> Session::add_cookie(JsonValue const& payload)
     if (auto name_attribute = data.get("name"sv); name_attribute.is_string())
         cookie.name = name_attribute.as_string();
     else
-        return WebDriverError { 400, "invalid argument", "Expect name attribute to be string" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Expect name attribute to be string");
 
     if (auto value_attribute = data.get("value"sv); value_attribute.is_string())
         cookie.value = value_attribute.as_string();
     else
-        return WebDriverError { 400, "invalid argument", "Expect value attribute to be string" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Expect value attribute to be string");
 
     // Cookie path
     //     The value if the entry exists, otherwise "/".
@@ -863,7 +863,7 @@ ErrorOr<JsonValue, WebDriverError> Session::add_cookie(JsonValue const& payload)
         if (auto path_attribute = data.get("path"sv); path_attribute.is_string())
             cookie.path = path_attribute.as_string();
         else
-            return WebDriverError { 400, "invalid argument", "Expect path attribute to be string" };
+            return WebDriverError::from_code(ErrorCode::InvalidArgument, "Expect path attribute to be string");
     } else {
         cookie.path = "/";
     }
@@ -875,7 +875,7 @@ ErrorOr<JsonValue, WebDriverError> Session::add_cookie(JsonValue const& payload)
         if (auto domain_attribute = data.get("domain"sv); domain_attribute.is_string())
             cookie.domain = domain_attribute.as_string();
         else
-            return WebDriverError { 400, "invalid argument", "Expect domain attribute to be string" };
+            return WebDriverError::from_code(ErrorCode::InvalidArgument, "Expect domain attribute to be string");
     }
 
     // Cookie secure only
@@ -936,7 +936,7 @@ ErrorOr<JsonValue, WebDriverError> Session::delete_cookie(StringView const& name
     // 1. If the current browsing context is no longer open, return error with error code no such window.
     auto current_window = this->current_window();
     if (!current_window.has_value())
-        return WebDriverError { 404, "no such window", "Window not found" };
+        return WebDriverError::from_code(ErrorCode::NoSuchWindow, "Window not found");
 
     // FIXME: 2. Handle any user prompts, and return its value if it is an error.
 
@@ -953,7 +953,7 @@ ErrorOr<JsonValue, WebDriverError> Session::delete_all_cookies()
     // 1. If the current browsing context is no longer open, return error with error code no such window.
     auto current_window = this->current_window();
     if (!current_window.has_value())
-        return WebDriverError { 404, "no such window", "Window not found" };
+        return WebDriverError::from_code(ErrorCode::NoSuchWindow, "Window not found");
 
     // FIXME: 2. Handle any user prompts, and return its value if it is an error.
 
diff --git a/Userland/Services/WebDriver/TimeoutsConfiguration.cpp b/Userland/Services/WebDriver/TimeoutsConfiguration.cpp
index 1d58504561..91c825ae3d 100644
--- a/Userland/Services/WebDriver/TimeoutsConfiguration.cpp
+++ b/Userland/Services/WebDriver/TimeoutsConfiguration.cpp
@@ -44,7 +44,7 @@ ErrorOr<TimeoutsConfiguration, WebDriverError> json_deserialize_as_a_timeouts_co
 
     // 2. If value is not a JSON Object, return error with error code invalid argument.
     if (!value.is_object())
-        return WebDriverError { 400, "invalid argument", "Payload is not a JSON object" };
+        return WebDriverError::from_code(ErrorCode::InvalidArgument, "Payload is not a JSON object");
 
     // 3. If value has a property with the key "script":
     if (value.as_object().has("script"sv)) {
@@ -53,7 +53,7 @@ ErrorOr<TimeoutsConfiguration, WebDriverError> json_deserialize_as_a_timeouts_co
 
         // 2. If script duration is a number and less than 0 or greater than maximum safe integer, or it is not null, return error with error code invalid argument.
         if ((script_duration.is_number() && (script_duration.to_i64() < 0 || script_duration.to_i64() > max_safe_integer)) || !script_duration.is_null())
-            return WebDriverError { 400, "invalid argument", "Invalid script duration" };
+            return WebDriverError::from_code(ErrorCode::InvalidArgument, "Invalid script duration");
 
         // 3. Set timeouts’s script timeout to script duration.
         timeouts.script_timeout = script_duration.is_null() ? Optional<u64> {} : script_duration.to_u64();
@@ -66,7 +66,7 @@ ErrorOr<TimeoutsConfiguration, WebDriverError> json_deserialize_as_a_timeouts_co
 
         // 2. If page load duration is less than 0 or greater than maximum safe integer, return error with error code invalid argument.
         if (!page_load_duration.is_number() || page_load_duration.to_i64() < 0 || page_load_duration.to_i64() > max_safe_integer)
-            return WebDriverError { 400, "invalid argument", "Invalid page load duration" };
+            return WebDriverError::from_code(ErrorCode::InvalidArgument, "Invalid page load duration");
 
         // 3. Set timeouts’s page load timeout to page load duration.
         timeouts.page_load_timeout = page_load_duration.to_u64();
@@ -79,7 +79,7 @@ ErrorOr<TimeoutsConfiguration, WebDriverError> json_deserialize_as_a_timeouts_co
 
         // 2. If implicit duration is less than 0 or greater than maximum safe integer, return error with error code invalid argument.
         if (!implicit_duration.is_number() || implicit_duration.to_i64() < 0 || implicit_duration.to_i64() > max_safe_integer)
-            return WebDriverError { 400, "invalid argument", "Invalid implicit duration" };
+            return WebDriverError::from_code(ErrorCode::InvalidArgument, "Invalid implicit duration");
 
         // 3. Set timeouts’s implicit wait timeout to implicit duration.
         timeouts.implicit_wait_timeout = implicit_duration.to_u64();