diff --git a/packages/wasm-utils/src/wasm.http.shared.pas b/packages/wasm-utils/src/wasm.http.shared.pas
new file mode 100644
index 0000000..b79306b
--- /dev/null
+++ b/packages/wasm-utils/src/wasm.http.shared.pas
@@ -0,0 +1,93 @@
+{
+    This file is part of the Free Component Library
+
+    Webassembly HTTP API - shared constants 
+    Copyright (c) 2024 by Michael Van Canneyt michael@freepascal.org
+
+    See the file COPYING.FPC, included in this distribution,
+    for details about the copyright.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+ **********************************************************************}
+
+unit wasm.http.shared;
+
+{$mode ObjFPC}{$H+}
+
+interface
+
+Const
+  WASMHTTP_CACHE_DEFAULT        = 0;
+  WASMHTTP_CACHE_NO_STORE       = 1;
+  WASMHTTP_CACHE_RELOAD         = 2;
+  WASMHTTP_CACHE_NO_CACHE       = 3;
+  WASMHTTP_CACHE_FORCE_CACHE    = 4;
+  WASMHTTP_CACHE_ONLY_IF_CACHED = 5;
+
+  WASMHTTP_CREDENTIALS_SAME_ORIGIN = 0;
+  WASMHTTP_CREDENTIALS_OMIT        = 1;
+  WASMHTTP_CREDENTIALS_INCLUDE     = 2;
+
+  WASMHTTP_MODE_CORS        = 0;
+  WASMHTTP_MODE_SAME_ORIGIN = 1;
+  WASMHTTP_MODE_NO_CORS     = 2;
+  WASMHTTP_MODE_NAVIGATE    = 3;
+  WASMHTTP_MODE_WEBSOCKET   = 4;
+
+  WASMHTTP_PRIORITY_AUTO    = 0;
+  WASMHTTP_PRIORITY_LOW     = 1;
+  WASMHTTP_PRIORITY_HIGH    = 2;
+
+  WASMHTTP_REDIRECT_FOLLOW  = 0;
+  WASMHTTP_REDIRECT_ERROR   = 1;
+  WASMHTTP_REDIRECT_MANUAL  = 2;
+
+  WASMHTTP_ABORTSIGNAL_NO  = 0;
+  WASMHTTP_ABORTSIGNAL_YES = 1;
+
+  WASMHTTP_RESULT_SUCCESS         = 0;
+  WASMHTTP_RESULT_ERROR           = -1;
+  WASMHTTP_RESULT_NO_URL          = -2;
+  WASMHTTP_RESULT_INVALIDID       = -3;
+  WASMHTTP_RESULT_INPROGRESS      = -4;
+  WASMHTTP_RESULT_INSUFFICIENTMEM = -5;
+
+  WASMHTTP_RESPONSE_SUCCESS    = 0;
+  WASMHTTP_RESPONSE_DEALLOCATE = 1;
+  WASMHTTP_RESPONSE_ERROR      = -1;
+
+Type
+  TWasmHTTPRequestID = Longint;
+  {$IFDEF PAS2JS}
+  TWasmPointer = Longint;
+  PWasmHTTPRequestID = TWasmPointer;
+  {$ELSE}
+  PWasmHTTPRequestID = ^TWasmHTTPRequestID;
+  {$ENDIF}
+
+  TWasmHTTPResult = Longint;
+  TWasmHTTPResponseResult = Longint;
+  TWasmHTTPResponseStatus = Longint;
+  TWasmHTTPResponseInfoType = Longint;
+
+const
+  httpExportName = 'http';
+  httpFN_RequestAllocate = 'request_allocate';
+  httpFN_RequestExecute  = 'request_execute';
+  httpFN_RequestDeAllocate = 'request_deallocate';
+  httpFN_RequestAbort = 'request_abort';
+  httpFN_ResponseGetStatus = 'response_get_status';
+  httpFN_ResponseGetStatusText = 'response_get_status_text';
+  httpFN_ResponseGetHeaderName = 'response_get_header_name';
+  httpFN_ResponseGetHeaderCount = 'response_get_header_count';
+  httpFN_ResponseGetHeader = 'response_get_header';
+  httpFN_ResponseGetBody = 'response_get_body';
+  httpFN_ResponseCallback = '__wasmhttp_response_callback';
+
+implementation
+
+end.
+
diff --git a/packages/wasm-utils/src/wasm.websocket.shared.pas b/packages/wasm-utils/src/wasm.websocket.shared.pas
new file mode 100644
index 0000000..6c44559
--- /dev/null
+++ b/packages/wasm-utils/src/wasm.websocket.shared.pas
@@ -0,0 +1,68 @@
+{
+    This file is part of the Free Component Library
+
+    Webassembly Websocket API - Definitions shared with host implementation.
+    Copyright (c) 2024 by Michael Van Canneyt michael@freepascal.org
+
+    See the file COPYING.FPC, included in this distribution,
+    for details about the copyright.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+ **********************************************************************}
+unit wasm.websocket.shared;
+
+{$mode ObjFPC}{$H+}
+
+interface
+
+uses
+  {$IFDEF FPC_DOTTEDUNITS}
+  System.SysUtils;
+  {$ELSE}
+  sysutils;
+  {$ENDIF}
+
+Type
+  TWasmWebsocketResult = longint;
+  TWasmWebsocketID = longint;
+  TBuffer = longint;
+  TWasmWebSocketMessageType = Longint;
+  TWebsocketCallBackResult = Longint;
+
+  {$IFNDEF PAS2JS}
+  PWasmWebSocketID = ^TWasmWebsocketID;
+  {$ELSE}
+  TWasmPointer = longint;
+
+  PByte = TWasmPointer;
+  PWasmWebSocketID = TWasmPointer;
+  {$endif}
+
+Const
+  WASMWS_RESULT_SUCCESS   = 0;
+  WASMWS_RESULT_ERROR     = -1;
+  WASMWS_RESULT_NO_URL    = -2;
+  WASMWS_RESULT_INVALIDID = -3;
+
+  WASMWS_CALLBACK_SUCCESS   = 0;
+  WASMWS_CALLBACK_NOHANDLER = -1;
+  WASMWS_CALLBACK_ERROR     = -2;
+
+  WASMWS_MESSAGE_TYPE_TEXT   = 0;
+  WASMWS_MESSAGE_TYPE_BINARY = 1;
+
+const
+  websocketExportName  = 'websocket';
+  websocketFN_Allocate = 'allocate';
+  websocketFN_DeAllocate = 'deallocate';
+  websocketFN_close = 'close';
+  websocketFN_send = 'send';
+
+
+implementation
+
+end.
+