diff --git a/src/libs/languageserverprotocol/client.cpp b/src/libs/languageserverprotocol/client.cpp
index fd62fa548fd..1504fc5e1e9 100644
--- a/src/libs/languageserverprotocol/client.cpp
+++ b/src/libs/languageserverprotocol/client.cpp
@@ -31,7 +31,7 @@ constexpr const char RegisterCapabilityRequest::methodName[];
 constexpr const char UnregisterCapabilityRequest::methodName[];
 
 RegisterCapabilityRequest::RegisterCapabilityRequest(const RegistrationParams &params)
-    : RegisterCapabilityRequest(methodName, params) { }
+    : Request(methodName, params) { }
 
 UnregisterCapabilityRequest::UnregisterCapabilityRequest(const UnregistrationParams &params)
     : UnregisterCapabilityRequest(methodName, params) { }
diff --git a/src/libs/languageserverprotocol/client.h b/src/libs/languageserverprotocol/client.h
index a07d48e94f9..830d1caae43 100644
--- a/src/libs/languageserverprotocol/client.h
+++ b/src/libs/languageserverprotocol/client.h
@@ -73,7 +73,7 @@ class LANGUAGESERVERPROTOCOL_EXPORT RegisterCapabilityRequest : public Request<
         std::nullptr_t, std::nullptr_t, RegistrationParams>
 {
 public:
-    RegisterCapabilityRequest(const RegistrationParams &params = RegistrationParams());
+    RegisterCapabilityRequest(const RegistrationParams &params);
     using Request::Request;
     constexpr static const char methodName[] = "client/registerCapability";
 };
@@ -111,7 +111,7 @@ class LANGUAGESERVERPROTOCOL_EXPORT UnregisterCapabilityRequest : public Request
         std::nullptr_t, std::nullptr_t, UnregistrationParams>
 {
 public:
-    UnregisterCapabilityRequest(const UnregistrationParams &params = UnregistrationParams());
+    UnregisterCapabilityRequest(const UnregistrationParams &params);
     using Request::Request;
     constexpr static const char methodName[] = "client/unregisterCapability";
 };
diff --git a/src/libs/languageserverprotocol/completion.h b/src/libs/languageserverprotocol/completion.h
index 629f0eb3980..4e8d34d1c91 100644
--- a/src/libs/languageserverprotocol/completion.h
+++ b/src/libs/languageserverprotocol/completion.h
@@ -256,7 +256,7 @@ class LANGUAGESERVERPROTOCOL_EXPORT CompletionRequest : public Request<
         CompletionResult, std::nullptr_t, CompletionParams>
 {
 public:
-    CompletionRequest(const CompletionParams &params = CompletionParams());
+    CompletionRequest(const CompletionParams &params);
     using Request::Request;
     constexpr static const char methodName[] = "textDocument/completion";
 };
@@ -265,7 +265,7 @@ class LANGUAGESERVERPROTOCOL_EXPORT CompletionItemResolveRequest : public Reques
         CompletionItem, std::nullptr_t, CompletionItem>
 {
 public:
-    CompletionItemResolveRequest(const CompletionItem &params = CompletionItem());
+    CompletionItemResolveRequest(const CompletionItem &params);
     using Request::Request;
     constexpr static const char methodName[] = "completionItem/resolve";
 };
diff --git a/src/libs/languageserverprotocol/diagnostics.h b/src/libs/languageserverprotocol/diagnostics.h
index 24c470b2d1c..7525871b051 100644
--- a/src/libs/languageserverprotocol/diagnostics.h
+++ b/src/libs/languageserverprotocol/diagnostics.h
@@ -49,8 +49,7 @@ public:
 class LANGUAGESERVERPROTOCOL_EXPORT PublishDiagnosticsNotification : public Notification<PublishDiagnosticsParams>
 {
 public:
-    PublishDiagnosticsNotification(
-            const PublishDiagnosticsParams &params = PublishDiagnosticsParams());
+    PublishDiagnosticsNotification(const PublishDiagnosticsParams &params);
     using Notification::Notification;
     constexpr static const char methodName[] = "textDocument/publishDiagnostics";
 };
diff --git a/src/libs/languageserverprotocol/initializemessages.cpp b/src/libs/languageserverprotocol/initializemessages.cpp
index 66e3407fe11..6cb807a2a23 100644
--- a/src/libs/languageserverprotocol/initializemessages.cpp
+++ b/src/libs/languageserverprotocol/initializemessages.cpp
@@ -155,8 +155,8 @@ InitializeRequest::InitializeRequest(const InitializeParams &params)
     : Request(methodName, params)
 { }
 
-InitializeNotification::InitializeNotification()
-    : Notification(methodName)
+InitializeNotification::InitializeNotification(const InitializedParams &params)
+    : Notification(methodName, params)
 { }
 
 } // namespace LanguageServerProtocol
diff --git a/src/libs/languageserverprotocol/initializemessages.h b/src/libs/languageserverprotocol/initializemessages.h
index a79d6e067a2..700caf85373 100644
--- a/src/libs/languageserverprotocol/initializemessages.h
+++ b/src/libs/languageserverprotocol/initializemessages.h
@@ -129,7 +129,7 @@ using InitializedParams = JsonObject;
 class LANGUAGESERVERPROTOCOL_EXPORT InitializeNotification : public Notification<InitializedParams>
 {
 public:
-    InitializeNotification();
+    InitializeNotification(const InitializedParams &params);
     using Notification::Notification;
     constexpr static const char methodName[] = "initialized";
 
diff --git a/src/libs/languageserverprotocol/jsonrpcmessages.h b/src/libs/languageserverprotocol/jsonrpcmessages.h
index 4dd4f7f9002..b5d36e4c4f9 100644
--- a/src/libs/languageserverprotocol/jsonrpcmessages.h
+++ b/src/libs/languageserverprotocol/jsonrpcmessages.h
@@ -88,13 +88,14 @@ template <typename Params>
 class Notification : public JsonRpcMessage
 {
 public:
-    Notification() : Notification(QString()) {}
-    Notification(const QString &methodName, const Params &params = Params())
+    Notification(const QString &methodName, const Params &params)
     {
         setMethod(methodName);
         setParams(params);
     }
-    using JsonRpcMessage::JsonRpcMessage;
+
+    Notification(const QJsonObject &jsonObject) : JsonRpcMessage(jsonObject) {}
+    Notification(QJsonObject &&jsonObject) : JsonRpcMessage(std::move(jsonObject)) {}
 
     QString method() const
     { return fromJsonValue<QString>(m_jsonObject.value(methodKey)); }
@@ -267,8 +268,7 @@ template <typename Result, typename ErrorDataType, typename Params>
 class Request : public Notification<Params>
 {
 public:
-    Request() : Notification<Params>() { setId(QUuid::createUuid().toString()); }
-    Request(const QString &methodName, const Params &params = Params())
+    Request(const QString &methodName, const Params &params)
         : Notification<Params>(methodName, params)
     { setId(QUuid::createUuid().toString()); }
     Request(const QJsonObject &jsonObject) : Notification<Params>(jsonObject) { }
@@ -343,7 +343,7 @@ public:
 class LANGUAGESERVERPROTOCOL_EXPORT CancelRequest : public Notification<CancelParameter>
 {
 public:
-    CancelRequest(const CancelParameter &params = CancelParameter());
+    CancelRequest(const CancelParameter &params);
     using Notification::Notification;
     constexpr static const char methodName[] = "$/cancelRequest";
 };
diff --git a/src/libs/languageserverprotocol/languagefeatures.h b/src/libs/languageserverprotocol/languagefeatures.h
index bc4eaa61ab7..ee40187a71f 100644
--- a/src/libs/languageserverprotocol/languagefeatures.h
+++ b/src/libs/languageserverprotocol/languagefeatures.h
@@ -898,8 +898,7 @@ class LANGUAGESERVERPROTOCOL_EXPORT SemanticHighlightNotification
     : public Notification<SemanticHighlightingParams>
 {
 public:
-    SemanticHighlightNotification(
-        const SemanticHighlightingParams &params = SemanticHighlightingParams());
+    SemanticHighlightNotification(const SemanticHighlightingParams &params);
     using Notification::Notification;
     constexpr static const char methodName[] = "textDocument/semanticHighlighting";
 };
diff --git a/src/libs/languageserverprotocol/messages.cpp b/src/libs/languageserverprotocol/messages.cpp
index 149428b01ac..44a699ca257 100644
--- a/src/libs/languageserverprotocol/messages.cpp
+++ b/src/libs/languageserverprotocol/messages.cpp
@@ -42,12 +42,12 @@ ShowMessageRequest::ShowMessageRequest(const ShowMessageRequestParams &params)
     : Request(methodName, params)
 { }
 
-LogMessageNotification::LogMessageNotification()
-    : Notification(methodName)
+LogMessageNotification::LogMessageNotification(const LogMessageParams &params)
+    : Notification(methodName, params)
 { }
 
-TelemetryNotification::TelemetryNotification()
-    : Notification(methodName)
+TelemetryNotification::TelemetryNotification(const JsonObject &params)
+    : Notification(methodName, params)
 { }
 
 bool ShowMessageRequestParams::isValid(ErrorHierarchy *error) const
diff --git a/src/libs/languageserverprotocol/messages.h b/src/libs/languageserverprotocol/messages.h
index 0672ad2cc7e..0c10b823db3 100644
--- a/src/libs/languageserverprotocol/messages.h
+++ b/src/libs/languageserverprotocol/messages.h
@@ -56,7 +56,7 @@ public:
 class LANGUAGESERVERPROTOCOL_EXPORT ShowMessageNotification : public Notification<ShowMessageParams>
 {
 public:
-    ShowMessageNotification(const ShowMessageParams &params = ShowMessageParams());
+    ShowMessageNotification(const ShowMessageParams &params);
     using Notification::Notification;
     constexpr static const char methodName[] = "window/showMessage";
 };
@@ -90,7 +90,7 @@ class LANGUAGESERVERPROTOCOL_EXPORT ShowMessageRequest : public Request<
         LanguageClientValue<MessageActionItem>, std::nullptr_t, ShowMessageRequestParams>
 {
 public:
-    ShowMessageRequest(const ShowMessageRequestParams &params = ShowMessageRequestParams());
+    ShowMessageRequest(const ShowMessageRequestParams &params);
     using Request::Request;
     constexpr static const char methodName[] = "window/showMessageRequest";
 };
@@ -100,7 +100,7 @@ using LogMessageParams = ShowMessageParams;
 class LANGUAGESERVERPROTOCOL_EXPORT LogMessageNotification : public Notification<LogMessageParams>
 {
 public:
-    LogMessageNotification();
+    LogMessageNotification(const LogMessageParams &params);
     using Notification::Notification;
     constexpr static const char methodName[] = "window/logMessage";
 };
@@ -108,7 +108,7 @@ public:
 class LANGUAGESERVERPROTOCOL_EXPORT TelemetryNotification : public Notification<JsonObject>
 {
 public:
-    TelemetryNotification();
+    TelemetryNotification(const JsonObject &params);
     using Notification::Notification;
     constexpr static const char methodName[] = "telemetry/event";
 
diff --git a/src/libs/languageserverprotocol/shutdownmessages.cpp b/src/libs/languageserverprotocol/shutdownmessages.cpp
index 720ac6a6953..01e4ea5763f 100644
--- a/src/libs/languageserverprotocol/shutdownmessages.cpp
+++ b/src/libs/languageserverprotocol/shutdownmessages.cpp
@@ -29,7 +29,7 @@ namespace LanguageServerProtocol {
 
 constexpr const char ShutdownRequest::methodName[];
 constexpr const char ExitNotification::methodName[];
-ShutdownRequest::ShutdownRequest() : Request(methodName) { }
+ShutdownRequest::ShutdownRequest() : Request(methodName, nullptr) { }
 ExitNotification::ExitNotification() : Notification(methodName) { }
 
 } // namespace LanguageServerProtocol
diff --git a/src/libs/languageserverprotocol/textsynchronization.h b/src/libs/languageserverprotocol/textsynchronization.h
index dbb3311ad9c..9656455d6fc 100644
--- a/src/libs/languageserverprotocol/textsynchronization.h
+++ b/src/libs/languageserverprotocol/textsynchronization.h
@@ -49,8 +49,7 @@ class LANGUAGESERVERPROTOCOL_EXPORT DidOpenTextDocumentNotification : public Not
         DidOpenTextDocumentParams>
 {
 public:
-    DidOpenTextDocumentNotification(
-            const DidOpenTextDocumentParams &params = DidOpenTextDocumentParams());
+    DidOpenTextDocumentNotification(const DidOpenTextDocumentParams &params);
     using Notification::Notification;
     constexpr static const char methodName[] = "textDocument/didOpen";
 };
@@ -123,7 +122,7 @@ class LANGUAGESERVERPROTOCOL_EXPORT DidChangeTextDocumentNotification : public N
         DidChangeTextDocumentParams>
 {
 public:
-    DidChangeTextDocumentNotification(const DidChangeTextDocumentParams &params = DidChangeTextDocumentParams());
+    DidChangeTextDocumentNotification(const DidChangeTextDocumentParams &params);
     using Notification::Notification;
     constexpr static const char methodName[] = "textDocument/didChange";
 };
@@ -158,8 +157,7 @@ class LANGUAGESERVERPROTOCOL_EXPORT WillSaveTextDocumentNotification : public No
         WillSaveTextDocumentParams>
 {
 public:
-    WillSaveTextDocumentNotification(
-            const WillSaveTextDocumentParams &params = WillSaveTextDocumentParams());
+    WillSaveTextDocumentNotification(const WillSaveTextDocumentParams &params);
     using Notification::Notification;
     constexpr static const char methodName[] = "textDocument/willSave";
 };
@@ -168,8 +166,7 @@ class LANGUAGESERVERPROTOCOL_EXPORT WillSaveWaitUntilTextDocumentRequest : publi
         LanguageClientArray<TextEdit>, std::nullptr_t, WillSaveTextDocumentParams>
 {
 public:
-    WillSaveWaitUntilTextDocumentRequest(
-            const WillSaveTextDocumentParams &params = WillSaveTextDocumentParams());
+    WillSaveWaitUntilTextDocumentRequest(const WillSaveTextDocumentParams &params);
     using Request::Request;
     constexpr static const char methodName[] = "textDocument/willSaveWaitUntil";
 };
@@ -210,8 +207,7 @@ class LANGUAGESERVERPROTOCOL_EXPORT DidSaveTextDocumentNotification : public Not
         DidSaveTextDocumentParams>
 {
 public:
-    DidSaveTextDocumentNotification(
-            const DidSaveTextDocumentParams &params = DidSaveTextDocumentParams());
+    DidSaveTextDocumentNotification(const DidSaveTextDocumentParams &params);
     using Notification::Notification;
     constexpr static const char methodName[] = "textDocument/didSave";
 };
@@ -236,8 +232,7 @@ class LANGUAGESERVERPROTOCOL_EXPORT DidCloseTextDocumentNotification : public No
         DidCloseTextDocumentParams>
 {
 public:
-    DidCloseTextDocumentNotification(
-            const DidCloseTextDocumentParams &params = DidCloseTextDocumentParams());
+    DidCloseTextDocumentNotification(const DidCloseTextDocumentParams &params);
     using Notification::Notification;
     constexpr static const char methodName[] = "textDocument/didClose";
 };
diff --git a/src/libs/languageserverprotocol/workspace.cpp b/src/libs/languageserverprotocol/workspace.cpp
index 267566042e8..3821d6a99ed 100644
--- a/src/libs/languageserverprotocol/workspace.cpp
+++ b/src/libs/languageserverprotocol/workspace.cpp
@@ -37,7 +37,7 @@ constexpr const char ApplyWorkspaceEditRequest::methodName[];
 constexpr const char DidChangeWatchedFilesNotification::methodName[];
 
 WorkSpaceFolderRequest::WorkSpaceFolderRequest()
-    : Request(methodName)
+    : Request(methodName, nullptr)
 { }
 
 DidChangeWorkspaceFoldersNotification::DidChangeWorkspaceFoldersNotification(
diff --git a/src/libs/languageserverprotocol/workspace.h b/src/libs/languageserverprotocol/workspace.h
index dccd0c361a8..00669eba01f 100644
--- a/src/libs/languageserverprotocol/workspace.h
+++ b/src/libs/languageserverprotocol/workspace.h
@@ -80,8 +80,7 @@ class LANGUAGESERVERPROTOCOL_EXPORT DidChangeWorkspaceFoldersNotification : publ
         DidChangeWorkspaceFoldersParams>
 {
 public:
-    DidChangeWorkspaceFoldersNotification(
-            const DidChangeWorkspaceFoldersParams &params = DidChangeWorkspaceFoldersParams());
+    DidChangeWorkspaceFoldersNotification(const DidChangeWorkspaceFoldersParams &params);
     constexpr static const char methodName[] = "workspace/didChangeWorkspaceFolders";
     using Notification::Notification;
 };
@@ -101,8 +100,7 @@ class LANGUAGESERVERPROTOCOL_EXPORT DidChangeConfigurationNotification : public
         DidChangeConfigurationParams>
 {
 public:
-    DidChangeConfigurationNotification(
-            const DidChangeConfigurationParams &params = DidChangeConfigurationParams());
+    DidChangeConfigurationNotification(const DidChangeConfigurationParams &params);
     using Notification::Notification;
     constexpr static const char methodName[] = "workspace/didChangeConfiguration";
 };
@@ -138,7 +136,7 @@ class LANGUAGESERVERPROTOCOL_EXPORT ConfigurationRequest : public Request<
         LanguageClientArray<QJsonValue>, std::nullptr_t, ConfigurationParams>
 {
 public:
-    ConfigurationRequest(const ConfigurationParams &params = ConfigurationParams());
+    ConfigurationRequest(const ConfigurationParams &params);
     using Request::Request;
     constexpr static const char methodName[] = "workspace/configuration";
 };
@@ -180,7 +178,7 @@ class LANGUAGESERVERPROTOCOL_EXPORT DidChangeWatchedFilesNotification : public N
         DidChangeWatchedFilesParams>
 {
 public:
-    DidChangeWatchedFilesNotification(const DidChangeWatchedFilesParams &params = DidChangeWatchedFilesParams());
+    DidChangeWatchedFilesNotification(const DidChangeWatchedFilesParams &params);
     using Notification::Notification;
     constexpr static const char methodName[] = "workspace/didChangeWatchedFiles";
 };
@@ -200,7 +198,7 @@ class LANGUAGESERVERPROTOCOL_EXPORT WorkspaceSymbolRequest : public Request<
         LanguageClientArray<SymbolInformation>, std::nullptr_t, WorkspaceSymbolParams>
 {
 public:
-    WorkspaceSymbolRequest(const WorkspaceSymbolParams &params = WorkspaceSymbolParams());
+    WorkspaceSymbolRequest(const WorkspaceSymbolParams &params);
     using Request::Request;
     constexpr static const char methodName[] = "workspace/symbol";
 };
@@ -231,7 +229,7 @@ class LANGUAGESERVERPROTOCOL_EXPORT ExecuteCommandRequest : public Request<
         QJsonValue, std::nullptr_t, ExecuteCommandParams>
 {
 public:
-    ExecuteCommandRequest(const ExecuteCommandParams &params = ExecuteCommandParams());
+    ExecuteCommandRequest(const ExecuteCommandParams &params);
     using Request::Request;
     constexpr static const char methodName[] = "workspace/executeCommand";
 };
diff --git a/src/plugins/languageclient/client.cpp b/src/plugins/languageclient/client.cpp
index df91b152971..01bda90a6f4 100644
--- a/src/plugins/languageclient/client.cpp
+++ b/src/plugins/languageclient/client.cpp
@@ -1367,7 +1367,7 @@ void Client::initializeCallback(const InitializeRequest::Response &initResponse)
 
     qCDebug(LOGLSPCLIENT) << "language server " << m_displayName << " initialized";
     m_state = Initialized;
-    sendContent(InitializeNotification());
+    sendContent(InitializeNotification(InitializedParams()));
     if (m_dynamicCapabilities.isRegistered(DocumentSymbolsRequest::methodName)
             .value_or(capabilities().documentSymbolProvider().value_or(false))) {
         TextEditor::IOutlineWidgetFactory::updateOutline();
diff --git a/src/plugins/languageclient/languageclientcompletionassist.cpp b/src/plugins/languageclient/languageclientcompletionassist.cpp
index 0b38b42edc9..e354ae4db0c 100644
--- a/src/plugins/languageclient/languageclientcompletionassist.cpp
+++ b/src/plugins/languageclient/languageclientcompletionassist.cpp
@@ -336,7 +336,6 @@ IAssistProposal *LanguageClientCompletionAssistProcessor::perform(const AssistIn
     }
     if (m_postponedUpdateConnection)
         QObject::disconnect(m_postponedUpdateConnection);
-    CompletionRequest completionRequest;
     CompletionParams::CompletionContext context;
     if (interface->reason() == ActivationCharacter) {
         context.setTriggerKind(CompletionParams::TriggerCharacter);
@@ -346,7 +345,7 @@ IAssistProposal *LanguageClientCompletionAssistProcessor::perform(const AssistIn
     } else {
         context.setTriggerKind(CompletionParams::Invoked);
     }
-    auto params = completionRequest.params().value_or(CompletionParams());
+    CompletionParams params;
     int line;
     int column;
     if (!Utils::Text::convertPosition(interface->textDocument(), m_pos, &line, &column))
@@ -357,10 +356,10 @@ IAssistProposal *LanguageClientCompletionAssistProcessor::perform(const AssistIn
     params.setContext(context);
     params.setTextDocument(
                 DocumentUri::fromFilePath(Utils::FilePath::fromString(interface->fileName())));
+    CompletionRequest completionRequest(params);
     completionRequest.setResponseCallback([this](auto response) {
         this->handleCompletionResponse(response);
     });
-    completionRequest.setParams(params);
     m_client->sendContent(completionRequest);
     m_client->addAssistProcessor(this);
     m_currentRequest = completionRequest.id();