diff --git a/server/jetstream_api.go b/server/jetstream_api.go
index 16cd8b88464..b8d5bb88e76 100644
--- a/server/jetstream_api.go
+++ b/server/jetstream_api.go
@@ -1202,7 +1202,7 @@ func (s *Server) jsTemplateCreateRequest(sub *subscription, c *client, _ *Accoun
 
 	var cfg StreamTemplateConfig
 	if err := s.unmarshalRequest(ci, acc, subject, msg, &cfg); err != nil {
-		resp.Error = NewJSInvalidJSONError()
+		resp.Error = NewJSInvalidJSONError(err)
 		s.sendAPIErrResponse(ci, acc, subject, reply, string(msg), s.jsonResponse(&resp))
 		return
 	}
@@ -1259,7 +1259,7 @@ func (s *Server) jsTemplateNamesRequest(sub *subscription, c *client, _ *Account
 	if !isEmptyRequest(msg) {
 		var req JSApiStreamTemplatesRequest
 		if err := s.unmarshalRequest(ci, acc, subject, msg, &req); err != nil {
-			resp.Error = NewJSInvalidJSONError()
+			resp.Error = NewJSInvalidJSONError(err)
 			s.sendAPIErrResponse(ci, acc, subject, reply, string(msg), s.jsonResponse(&resp))
 			return
 		}
@@ -1442,7 +1442,7 @@ func (s *Server) jsStreamCreateRequest(sub *subscription, c *client, _ *Account,
 
 	var cfg StreamConfigRequest
 	if err := s.unmarshalRequest(ci, acc, subject, msg, &cfg); err != nil {
-		resp.Error = NewJSInvalidJSONError()
+		resp.Error = NewJSInvalidJSONError(err)
 		s.sendAPIErrResponse(ci, acc, subject, reply, string(msg), s.jsonResponse(&resp))
 		return
 	}
@@ -1549,7 +1549,7 @@ func (s *Server) jsStreamUpdateRequest(sub *subscription, c *client, _ *Account,
 	}
 	var ncfg StreamConfigRequest
 	if err := s.unmarshalRequest(ci, acc, subject, msg, &ncfg); err != nil {
-		resp.Error = NewJSInvalidJSONError()
+		resp.Error = NewJSInvalidJSONError(err)
 		s.sendAPIErrResponse(ci, acc, subject, reply, string(msg), s.jsonResponse(&resp))
 		return
 	}
@@ -1644,7 +1644,7 @@ func (s *Server) jsStreamNamesRequest(sub *subscription, c *client, _ *Account,
 	if !isEmptyRequest(msg) {
 		var req JSApiStreamNamesRequest
 		if err := s.unmarshalRequest(ci, acc, subject, msg, &req); err != nil {
-			resp.Error = NewJSInvalidJSONError()
+			resp.Error = NewJSInvalidJSONError(err)
 			s.sendAPIErrResponse(ci, acc, subject, reply, string(msg), s.jsonResponse(&resp))
 			return
 		}
@@ -1774,7 +1774,7 @@ func (s *Server) jsStreamListRequest(sub *subscription, c *client, _ *Account, s
 	if !isEmptyRequest(msg) {
 		var req JSApiStreamListRequest
 		if err := s.unmarshalRequest(ci, acc, subject, msg, &req); err != nil {
-			resp.Error = NewJSInvalidJSONError()
+			resp.Error = NewJSInvalidJSONError(err)
 			s.sendAPIErrResponse(ci, acc, subject, reply, string(msg), s.jsonResponse(&resp))
 			return
 		}
@@ -1944,7 +1944,7 @@ func (s *Server) jsStreamInfoRequest(sub *subscription, c *client, a *Account, s
 	if !isEmptyRequest(msg) {
 		var req JSApiStreamInfoRequest
 		if err := s.unmarshalRequest(ci, acc, subject, msg, &req); err != nil {
-			resp.Error = NewJSInvalidJSONError()
+			resp.Error = NewJSInvalidJSONError(err)
 			s.sendAPIErrResponse(ci, acc, subject, reply, string(msg), s.jsonResponse(&resp))
 			return
 		}
@@ -2302,7 +2302,7 @@ func (s *Server) jsStreamRemovePeerRequest(sub *subscription, c *client, _ *Acco
 
 	var req JSApiStreamRemovePeerRequest
 	if err := s.unmarshalRequest(ci, acc, subject, msg, &req); err != nil {
-		resp.Error = NewJSInvalidJSONError()
+		resp.Error = NewJSInvalidJSONError(err)
 		s.sendAPIErrResponse(ci, acc, subject, reply, string(msg), s.jsonResponse(&resp))
 		return
 	}
@@ -2382,7 +2382,7 @@ func (s *Server) jsLeaderServerRemoveRequest(sub *subscription, c *client, _ *Ac
 
 	var req JSApiMetaServerRemoveRequest
 	if err := s.unmarshalRequest(ci, acc, subject, msg, &req); err != nil {
-		resp.Error = NewJSInvalidJSONError()
+		resp.Error = NewJSInvalidJSONError(err)
 		s.sendAPIErrResponse(ci, acc, subject, reply, string(msg), s.jsonResponse(&resp))
 		return
 	}
@@ -2485,7 +2485,7 @@ func (s *Server) jsLeaderServerStreamMoveRequest(sub *subscription, c *client, _
 
 	var req JSApiMetaServerStreamMoveRequest
 	if err := s.unmarshalRequest(ci, acc, subject, msg, &req); err != nil {
-		resp.Error = NewJSInvalidJSONError()
+		resp.Error = NewJSInvalidJSONError(err)
 		s.sendAPIErrResponse(ci, acc, subject, reply, string(msg), s.jsonResponse(&resp))
 		return
 	}
@@ -2829,7 +2829,7 @@ func (s *Server) jsLeaderStepDownRequest(sub *subscription, c *client, _ *Accoun
 	if !isEmptyRequest(msg) {
 		var req JSApiLeaderStepdownRequest
 		if err := s.unmarshalRequest(ci, acc, subject, msg, &req); err != nil {
-			resp.Error = NewJSInvalidJSONError()
+			resp.Error = NewJSInvalidJSONError(err)
 			s.sendAPIErrResponse(ci, acc, subject, reply, string(msg), s.jsonResponse(&resp))
 			return
 		}
@@ -3035,7 +3035,7 @@ func (s *Server) jsMsgDeleteRequest(sub *subscription, c *client, _ *Account, su
 	}
 	var req JSApiMsgDeleteRequest
 	if err := s.unmarshalRequest(ci, acc, subject, msg, &req); err != nil {
-		resp.Error = NewJSInvalidJSONError()
+		resp.Error = NewJSInvalidJSONError(err)
 		s.sendAPIErrResponse(ci, acc, subject, reply, string(msg), s.jsonResponse(&resp))
 		return
 	}
@@ -3154,7 +3154,7 @@ func (s *Server) jsMsgGetRequest(sub *subscription, c *client, _ *Account, subje
 	}
 	var req JSApiMsgGetRequest
 	if err := s.unmarshalRequest(ci, acc, subject, msg, &req); err != nil {
-		resp.Error = NewJSInvalidJSONError()
+		resp.Error = NewJSInvalidJSONError(err)
 		s.sendAPIErrResponse(ci, acc, subject, reply, string(msg), s.jsonResponse(&resp))
 		return
 	}
@@ -3297,7 +3297,7 @@ func (s *Server) jsStreamPurgeRequest(sub *subscription, c *client, _ *Account,
 	if !isEmptyRequest(msg) {
 		var req JSApiStreamPurgeRequest
 		if err := s.unmarshalRequest(ci, acc, subject, msg, &req); err != nil {
-			resp.Error = NewJSInvalidJSONError()
+			resp.Error = NewJSInvalidJSONError(err)
 			s.sendAPIErrResponse(ci, acc, subject, reply, string(msg), s.jsonResponse(&resp))
 			return
 		}
@@ -3387,7 +3387,7 @@ func (s *Server) jsStreamRestoreRequest(sub *subscription, c *client, _ *Account
 
 	var req JSApiStreamRestoreRequest
 	if err := s.unmarshalRequest(ci, acc, subject, msg, &req); err != nil {
-		resp.Error = NewJSInvalidJSONError()
+		resp.Error = NewJSInvalidJSONError(err)
 		s.sendAPIErrResponse(ci, acc, subject, reply, string(msg), s.jsonResponse(&resp))
 		return
 	}
@@ -3689,7 +3689,7 @@ func (s *Server) jsStreamSnapshotRequest(sub *subscription, c *client, _ *Accoun
 
 	var req JSApiStreamSnapshotRequest
 	if err := s.unmarshalRequest(ci, acc, subject, msg, &req); err != nil {
-		resp.Error = NewJSInvalidJSONError()
+		resp.Error = NewJSInvalidJSONError(err)
 		s.sendAPIErrResponse(ci, acc, subject, reply, smsg, s.jsonResponse(&resp))
 		return
 	}
@@ -3887,7 +3887,7 @@ func (s *Server) jsConsumerCreateRequest(sub *subscription, c *client, a *Accoun
 
 	var req CreateConsumerRequest
 	if err := s.unmarshalRequest(ci, acc, subject, msg, &req); err != nil {
-		resp.Error = NewJSInvalidJSONError()
+		resp.Error = NewJSInvalidJSONError(err)
 		s.sendAPIErrResponse(ci, acc, subject, reply, string(msg), s.jsonResponse(&resp))
 		return
 	}
@@ -4124,7 +4124,7 @@ func (s *Server) jsConsumerNamesRequest(sub *subscription, c *client, _ *Account
 	if !isEmptyRequest(msg) {
 		var req JSApiConsumersRequest
 		if err := s.unmarshalRequest(ci, acc, subject, msg, &req); err != nil {
-			resp.Error = NewJSInvalidJSONError()
+			resp.Error = NewJSInvalidJSONError(err)
 			s.sendAPIErrResponse(ci, acc, subject, reply, string(msg), s.jsonResponse(&resp))
 			return
 		}
@@ -4246,7 +4246,7 @@ func (s *Server) jsConsumerListRequest(sub *subscription, c *client, _ *Account,
 	if !isEmptyRequest(msg) {
 		var req JSApiConsumersRequest
 		if err := s.unmarshalRequest(ci, acc, subject, msg, &req); err != nil {
-			resp.Error = NewJSInvalidJSONError()
+			resp.Error = NewJSInvalidJSONError(err)
 			s.sendAPIErrResponse(ci, acc, subject, reply, string(msg), s.jsonResponse(&resp))
 			return
 		}
@@ -4557,7 +4557,7 @@ func (s *Server) jsConsumerPauseRequest(sub *subscription, c *client, _ *Account
 
 	if !isEmptyRequest(msg) {
 		if err := s.unmarshalRequest(ci, acc, subject, msg, &req); err != nil {
-			resp.Error = NewJSInvalidJSONError()
+			resp.Error = NewJSInvalidJSONError(err)
 			s.sendAPIErrResponse(ci, acc, subject, reply, string(msg), s.jsonResponse(&resp))
 			return
 		}
diff --git a/server/jetstream_errors_generated.go b/server/jetstream_errors_generated.go
index 6c68094e014..8e16a6b9557 100644
--- a/server/jetstream_errors_generated.go
+++ b/server/jetstream_errors_generated.go
@@ -550,7 +550,7 @@ var (
 		JSConsumerWQRequiresExplicitAckErr:         {Code: 400, ErrCode: 10098, Description: "workqueue stream requires explicit ack"},
 		JSConsumerWithFlowControlNeedsHeartbeats:   {Code: 400, ErrCode: 10108, Description: "consumer with flow control also needs heartbeats"},
 		JSInsufficientResourcesErr:                 {Code: 503, ErrCode: 10023, Description: "insufficient resources"},
-		JSInvalidJSONErr:                           {Code: 400, ErrCode: 10025, Description: "invalid JSON"},
+		JSInvalidJSONErr:                           {Code: 400, ErrCode: 10025, Description: "invalid JSON: {err}"},
 		JSMaximumConsumersLimitErr:                 {Code: 400, ErrCode: 10026, Description: "maximum consumers limit reached"},
 		JSMaximumStreamsLimitErr:                   {Code: 400, ErrCode: 10027, Description: "maximum number of streams reached"},
 		JSMemoryResourcesExceededErr:               {Code: 500, ErrCode: 10028, Description: "insufficient memory resources available"},
@@ -1438,13 +1438,19 @@ func NewJSInsufficientResourcesError(opts ...ErrorOption) *ApiError {
 }
 
 // NewJSInvalidJSONError creates a new JSInvalidJSONErr error: "invalid JSON"
-func NewJSInvalidJSONError(opts ...ErrorOption) *ApiError {
+func NewJSInvalidJSONError(err error, opts ...ErrorOption) *ApiError {
 	eopts := parseOpts(opts)
 	if ae, ok := eopts.err.(*ApiError); ok {
 		return ae
 	}
 
-	return ApiErrors[JSInvalidJSONErr]
+	e := ApiErrors[JSInvalidJSONErr]
+	args := e.toReplacerArgs([]interface{}{"{err}", err})
+	return &ApiError{
+		Code:        e.Code,
+		ErrCode:     e.ErrCode,
+		Description: strings.NewReplacer(args...).Replace(e.Description),
+	}
 }
 
 // NewJSMaximumConsumersLimitError creates a new JSMaximumConsumersLimitErr error: "maximum consumers limit reached"
diff --git a/server/mqtt.go b/server/mqtt.go
index d9393f8de11..120dda2783b 100644
--- a/server/mqtt.go
+++ b/server/mqtt.go
@@ -1912,61 +1912,61 @@ func (as *mqttAccountSessionManager) processJSAPIReplies(_ *subscription, pc *cl
 	case mqttJSAStreamCreate:
 		var resp = &JSApiStreamCreateResponse{}
 		if err := json.Unmarshal(msg, resp); err != nil {
-			resp.Error = NewJSInvalidJSONError()
+			resp.Error = NewJSInvalidJSONError(err)
 		}
 		out(resp)
 	case mqttJSAStreamUpdate:
 		var resp = &JSApiStreamUpdateResponse{}
 		if err := json.Unmarshal(msg, resp); err != nil {
-			resp.Error = NewJSInvalidJSONError()
+			resp.Error = NewJSInvalidJSONError(err)
 		}
 		out(resp)
 	case mqttJSAStreamLookup:
 		var resp = &JSApiStreamInfoResponse{}
 		if err := json.Unmarshal(msg, &resp); err != nil {
-			resp.Error = NewJSInvalidJSONError()
+			resp.Error = NewJSInvalidJSONError(err)
 		}
 		out(resp)
 	case mqttJSAStreamDel:
 		var resp = &JSApiStreamDeleteResponse{}
 		if err := json.Unmarshal(msg, &resp); err != nil {
-			resp.Error = NewJSInvalidJSONError()
+			resp.Error = NewJSInvalidJSONError(err)
 		}
 		out(resp)
 	case mqttJSAConsumerCreate:
 		var resp = &JSApiConsumerCreateResponse{}
 		if err := json.Unmarshal(msg, resp); err != nil {
-			resp.Error = NewJSInvalidJSONError()
+			resp.Error = NewJSInvalidJSONError(err)
 		}
 		out(resp)
 	case mqttJSAConsumerDel:
 		var resp = &JSApiConsumerDeleteResponse{}
 		if err := json.Unmarshal(msg, resp); err != nil {
-			resp.Error = NewJSInvalidJSONError()
+			resp.Error = NewJSInvalidJSONError(err)
 		}
 		out(resp)
 	case mqttJSAMsgStore, mqttJSASessPersist:
 		var resp = &JSPubAckResponse{}
 		if err := json.Unmarshal(msg, resp); err != nil {
-			resp.Error = NewJSInvalidJSONError()
+			resp.Error = NewJSInvalidJSONError(err)
 		}
 		out(resp)
 	case mqttJSAMsgLoad:
 		var resp = &JSApiMsgGetResponse{}
 		if err := json.Unmarshal(msg, &resp); err != nil {
-			resp.Error = NewJSInvalidJSONError()
+			resp.Error = NewJSInvalidJSONError(err)
 		}
 		out(resp)
 	case mqttJSAStreamNames:
 		var resp = &JSApiStreamNamesResponse{}
 		if err := json.Unmarshal(msg, resp); err != nil {
-			resp.Error = NewJSInvalidJSONError()
+			resp.Error = NewJSInvalidJSONError(err)
 		}
 		out(resp)
 	case mqttJSAMsgDelete:
 		var resp = &JSApiMsgDeleteResponse{}
 		if err := json.Unmarshal(msg, resp); err != nil {
-			resp.Error = NewJSInvalidJSONError()
+			resp.Error = NewJSInvalidJSONError(err)
 		}
 		out(resp)
 	default: