diff --git a/apps/client/src/app/pages/accounts/create-or-update-account-dialog/create-or-update-account-dialog.component.ts b/apps/client/src/app/pages/accounts/create-or-update-account-dialog/create-or-update-account-dialog.component.ts
index c97bbf113..0aa3c3093 100644
--- a/apps/client/src/app/pages/accounts/create-or-update-account-dialog/create-or-update-account-dialog.component.ts
+++ b/apps/client/src/app/pages/accounts/create-or-update-account-dialog/create-or-update-account-dialog.component.ts
@@ -1,6 +1,7 @@
 import { CreateAccountDto } from '@ghostfolio/api/app/account/create-account.dto';
 import { UpdateAccountDto } from '@ghostfolio/api/app/account/update-account.dto';
 import { DataService } from '@ghostfolio/client/services/data.service';
+import { validateObjectForForm } from '@ghostfolio/client/util/validation.util';
 import { Currency } from '@ghostfolio/common/interfaces';
 
 import {
@@ -115,8 +116,14 @@ export class CreateOrUpdateAccountDialog implements OnDestroy {
 
     if (this.data.account.id) {
       (account as UpdateAccountDto).id = this.data.account.id;
+      validateObjectForForm(account, UpdateAccountDto, this.accountForm, () => {
+        this.dialogRef.close({ account });
+      });
     } else {
       delete (account as CreateAccountDto).id;
+      validateObjectForForm(account, CreateAccountDto, this.accountForm, () => {
+        this.dialogRef.close({ account });
+      });
     }
 
     this.dialogRef.close({ account });
diff --git a/apps/client/src/app/pages/accounts/create-or-update-account-dialog/create-or-update-account-dialog.html b/apps/client/src/app/pages/accounts/create-or-update-account-dialog/create-or-update-account-dialog.html
index e2981462f..007835a21 100644
--- a/apps/client/src/app/pages/accounts/create-or-update-account-dialog/create-or-update-account-dialog.html
+++ b/apps/client/src/app/pages/accounts/create-or-update-account-dialog/create-or-update-account-dialog.html
@@ -18,6 +18,9 @@
           matInput
           (keydown.enter)="$event.stopPropagation()"
         />
+        <mat-error *ngIf="accountForm.controls['name'].errors?.validationError">
+          {{ accountForm.controls['name'].errors?.validationError }}
+        </mat-error>
       </mat-form-field>
     </div>
     <div>
@@ -27,6 +30,11 @@
           formControlName="currency"
           [currencies]="currencies"
         />
+        <mat-error
+          *ngIf="accountForm.controls['currency'].errors?.validationError"
+        >
+          {{ accountForm.controls['currency'].errors?.validationError }}
+        </mat-error>
       </mat-form-field>
     </div>
     <div>
@@ -41,6 +49,11 @@
         <span class="ml-2" matTextSuffix>{{
           accountForm.controls['currency']?.value?.value
         }}</span>
+        <mat-error
+          *ngIf="accountForm.controls['balance'].errors?.validationError"
+        >
+          {{ accountForm.controls['balance'].errors?.validationError }}
+        </mat-error>
       </mat-form-field>
     </div>
     <div [ngClass]="{ 'd-none': platforms?.length < 1 }">
@@ -71,6 +84,11 @@
             </mat-option>
           }
         </mat-autocomplete>
+        <mat-error
+          *ngIf="accountForm.controls['platformId'].errors?.validationError"
+        >
+          {{ accountForm.controls['platformId'].errors?.validationError }}
+        </mat-error>
       </mat-form-field>
     </div>
     <div>
@@ -83,6 +101,11 @@
           matInput
           (keyup.enter)="$event.stopPropagation()"
         ></textarea>
+        <mat-error
+          *ngIf="accountForm.controls['comment'].errors?.validationError"
+        >
+          {{ accountForm.controls['comment'].errors?.validationError }}
+        </mat-error>
       </mat-form-field>
     </div>
     <div class="mb-3 px-2">
@@ -95,6 +118,11 @@
         <mat-form-field appearance="outline" class="w-100">
           <mat-label i18n>Account ID</mat-label>
           <input formControlName="accountId" matInput />
+          <mat-error
+            *ngIf="accountForm.controls['accountId'].errors?.validationError"
+          >
+            {{ accountForm.controls['accountId'].errors?.validationError }}
+          </mat-error>
         </mat-form-field>
       </div>
     }
diff --git a/apps/client/src/app/pages/portfolio/activities/create-or-update-activity-dialog/create-or-update-activity-dialog.component.ts b/apps/client/src/app/pages/portfolio/activities/create-or-update-activity-dialog/create-or-update-activity-dialog.component.ts
index 21a2ca920..ac966d221 100644
--- a/apps/client/src/app/pages/portfolio/activities/create-or-update-activity-dialog/create-or-update-activity-dialog.component.ts
+++ b/apps/client/src/app/pages/portfolio/activities/create-or-update-activity-dialog/create-or-update-activity-dialog.component.ts
@@ -1,6 +1,7 @@
 import { CreateOrderDto } from '@ghostfolio/api/app/order/create-order.dto';
 import { UpdateOrderDto } from '@ghostfolio/api/app/order/update-order.dto';
 import { DataService } from '@ghostfolio/client/services/data.service';
+import { validateObjectForForm } from '@ghostfolio/client/util/validation.util';
 import { getDateFormatString } from '@ghostfolio/common/helper';
 import { translate } from '@ghostfolio/ui/i18n';
 
@@ -19,7 +20,8 @@ import { MatAutocompleteSelectedEvent } from '@angular/material/autocomplete';
 import { DateAdapter, MAT_DATE_LOCALE } from '@angular/material/core';
 import { MAT_DIALOG_DATA, MatDialogRef } from '@angular/material/dialog';
 import { AssetClass, AssetSubClass, Tag, Type } from '@prisma/client';
-import { isUUID } from 'class-validator';
+import { plainToInstance } from 'class-transformer';
+import { Validator, isUUID, validate } from 'class-validator';
 import { isToday } from 'date-fns';
 import { EMPTY, Observable, Subject, lastValueFrom, of } from 'rxjs';
 import { catchError, delay, map, startWith, takeUntil } from 'rxjs/operators';
@@ -459,7 +461,7 @@ export class CreateOrUpdateActivityDialog implements OnDestroy {
       comment: this.activityForm.controls['comment'].value,
       currency: this.activityForm.controls['currency'].value,
       customCurrency: this.activityForm.controls['currencyOfUnitPrice'].value,
-      date: this.activityForm.controls['date'].value,
+      date: (this.activityForm.controls['date'].value as Date).toISOString(),
       dataSource: this.activityForm.controls['dataSource'].value,
       fee: this.activityForm.controls['fee'].value,
       quantity: this.activityForm.controls['quantity'].value,
@@ -476,12 +478,16 @@ export class CreateOrUpdateActivityDialog implements OnDestroy {
 
     if (this.data.activity.id) {
       (activity as UpdateOrderDto).id = this.data.activity.id;
+      validateObjectForForm(activity, UpdateOrderDto, this.activityForm, () => {
+        this.dialogRef.close({ activity });
+      });
     } else {
       (activity as CreateOrderDto).updateAccountBalance =
         this.activityForm.controls['updateAccountBalance'].value;
+      validateObjectForForm(activity, CreateOrderDto, this.activityForm, () => {
+        this.dialogRef.close({ activity });
+      });
     }
-
-    this.dialogRef.close({ activity });
   }
 
   public ngOnDestroy() {
diff --git a/apps/client/src/app/pages/portfolio/activities/create-or-update-activity-dialog/create-or-update-activity-dialog.html b/apps/client/src/app/pages/portfolio/activities/create-or-update-activity-dialog/create-or-update-activity-dialog.html
index 79ea7647a..37391a482 100644
--- a/apps/client/src/app/pages/portfolio/activities/create-or-update-activity-dialog/create-or-update-activity-dialog.html
+++ b/apps/client/src/app/pages/portfolio/activities/create-or-update-activity-dialog/create-or-update-activity-dialog.html
@@ -71,6 +71,11 @@
             >
           </mat-option>
         </mat-select>
+        <mat-error
+          *ngIf="activityForm.controls['type'].errors?.validationError"
+        >
+          {{ activityForm.controls['tye'].errors?.validationError }}
+        </mat-error>
       </mat-form-field>
     </div>
     <div [ngClass]="{ 'mb-3': data.activity.id }">
@@ -103,6 +108,11 @@
             </div>
           </mat-option>
         </mat-select>
+        <mat-error
+          *ngIf="activityForm.controls['accountId'].errors?.validationError"
+        >
+          {{ activityForm.controls['accountId'].errors?.validationError }}
+        </mat-error>
       </mat-form-field>
     </div>
     <div class="mb-3" [ngClass]="{ 'd-none': data.activity.id }">
@@ -124,6 +134,11 @@
           formControlName="searchSymbol"
           [isLoading]="isLoading"
         />
+        <mat-error
+          *ngIf="activityForm.controls['searchSymbol'].errors?.validationError"
+        >
+          {{ activityForm.controls['searchSymbol'].errors?.validationError }}
+        </mat-error>
       </mat-form-field>
     </div>
     <div
@@ -137,6 +152,11 @@
       <mat-form-field appearance="outline" class="w-100">
         <mat-label i18n>Name</mat-label>
         <input formControlName="name" matInput />
+        <mat-error
+          *ngIf="activityForm.controls['name'].errors?.validationError"
+        >
+          {{ activityForm.controls['name'].errors?.validationError }}
+        </mat-error>
       </mat-form-field>
     </div>
     <div class="d-none">
@@ -147,12 +167,22 @@
             currency
           }}</mat-option>
         </mat-select>
+        <mat-error
+          *ngIf="activityForm.controls['currency'].errors?.validationError"
+        >
+          {{ activityForm.controls['currency'].errors?.validationError }}
+        </mat-error>
       </mat-form-field>
     </div>
     <div class="d-none">
       <mat-form-field appearance="outline" class="w-100">
         <mat-label i18n>Data Source</mat-label>
         <input formControlName="dataSource" matInput />
+        <mat-error
+          *ngIf="activityForm.controls['dataSource'].errors?.validationError"
+        >
+          {{ activityForm.controls['dataSource'].errors?.validationError }}
+        </mat-error>
       </mat-form-field>
     </div>
     <div class="mb-3">
@@ -167,6 +197,11 @@
           />
         </mat-datepicker-toggle>
         <mat-datepicker #date disabled="false" />
+        <mat-error
+          *ngIf="activityForm.controls['date'].errors?.validationError"
+        >
+          {{ activityForm.controls['date'].errors?.validationError }}
+        </mat-error>
       </mat-form-field>
     </div>
     <div
@@ -182,6 +217,11 @@
       <mat-form-field appearance="outline" class="w-100">
         <mat-label i18n>Quantity</mat-label>
         <input formControlName="quantity" matInput type="number" />
+        <mat-error
+          *ngIf="activityForm.controls['quantity'].errors?.validationError"
+        >
+          {{ activityForm.controls['quantity'].errors?.validationError }}
+        </mat-error>
       </mat-form-field>
     </div>
     <div
@@ -271,6 +311,11 @@
         <span class="ml-2" matTextSuffix>{{
           activityForm.controls['currency'].value
         }}</span>
+        <mat-error
+          *ngIf="activityForm.controls['unitPrice'].errors?.validationError"
+        >
+          {{ activityForm.controls['unitPrice'].errors?.validationError }}
+        </mat-error>
       </mat-form-field>
     </div>
     <div
@@ -312,6 +357,9 @@
         <span class="ml-2" matTextSuffix>{{
           activityForm.controls['currency'].value
         }}</span>
+        <mat-error *ngIf="activityForm.controls['fee'].errors?.validationError">
+          {{ activityForm.controls['fee'].errors?.validationError }}
+        </mat-error>
       </mat-form-field>
     </div>
     <div class="mb-3">
@@ -324,6 +372,11 @@
           matInput
           (keyup.enter)="$event.stopPropagation()"
         ></textarea>
+        <mat-error
+          *ngIf="activityForm.controls['comment'].errors?.validationError"
+        >
+          {{ activityForm.controls['comment'].errors?.validationError }}
+        </mat-error>
       </mat-form-field>
     </div>
     <div
@@ -340,6 +393,11 @@
             >{{ assetClass.label }}</mat-option
           >
         </mat-select>
+        <mat-error
+          *ngIf="activityForm.controls['assetClass'].errors?.validationError"
+        >
+          {{ activityForm.controls['assetClass'].errors?.validationError }}
+        </mat-error>
       </mat-form-field>
     </div>
     <div
@@ -356,6 +414,11 @@
             >{{ assetSubClass.label }}</mat-option
           >
         </mat-select>
+        <mat-error
+          *ngIf="activityForm.controls['assetSubClass'].errors?.validationError"
+        >
+          {{ activityForm.controls['assetSubClass'].errors?.validationError }}
+        </mat-error>
       </mat-form-field>
     </div>
     <div class="mb-3" [ngClass]="{ 'd-none': tags?.length < 1 }">
diff --git a/apps/client/src/app/util/validation.util.ts b/apps/client/src/app/util/validation.util.ts
new file mode 100644
index 000000000..42172345a
--- /dev/null
+++ b/apps/client/src/app/util/validation.util.ts
@@ -0,0 +1,27 @@
+import { FormGroup } from '@angular/forms';
+import { plainToInstance } from 'class-transformer';
+import { validate } from 'class-validator';
+
+export function validateObjectForForm<T>(
+  obj: T,
+  ctor: { new (): T },
+  form: FormGroup,
+  onSuccess: () => void
+): void {
+  const objInstance = plainToInstance(ctor, obj);
+
+  validate(objInstance as object).then((errors) => {
+    if (errors.length === 0) {
+      onSuccess();
+    } else {
+      errors.forEach((error) => {
+        const formControl = form.get(error.property);
+        if (formControl) {
+          formControl.setErrors({
+            validationError: Object.values(error.constraints)[0]
+          });
+        }
+      });
+    }
+  });
+}