diff --git a/api/src/cms/decorators/unique-field-names.decorator.ts b/api/src/cms/decorators/unique-field-names.decorator.ts
new file mode 100644
index 00000000..1cbe555d
--- /dev/null
+++ b/api/src/cms/decorators/unique-field-names.decorator.ts
@@ -0,0 +1,23 @@
+/*
+ * Copyright © 2025 Hexastack. All rights reserved.
+ *
+ * Licensed under the GNU Affero General Public License v3.0 (AGPLv3) with the following additional terms:
+ * 1. The name "Hexabot" is a trademark of Hexastack. You may not use this name in derivative works without express written permission.
+ * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
+ */
+
+import { registerDecorator, ValidationOptions } from 'class-validator';
+
+import { UniqueFieldNamesConstraint } from '../validators/validate-unique-names.validator';
+
+export function UniqueFieldNames(validationOptions?: ValidationOptions) {
+  return function (object: Record<string, any>, propertyName: string) {
+    registerDecorator({
+      target: object.constructor,
+      propertyName,
+      options: validationOptions,
+      constraints: [],
+      validator: UniqueFieldNamesConstraint,
+    });
+  };
+}
diff --git a/api/src/cms/dto/contentType.dto.ts b/api/src/cms/dto/contentType.dto.ts
index 70fddc4c..09abdc70 100644
--- a/api/src/cms/dto/contentType.dto.ts
+++ b/api/src/cms/dto/contentType.dto.ts
@@ -21,6 +21,7 @@ import {
 import { FieldType } from '@/setting/schemas/types';
 import { DtoConfig } from '@/utils/types/dto.types';
 
+import { UniqueFieldNames } from '../decorators/unique-field-names.decorator';
 import { ValidateRequiredFields } from '../validators/validate-required-fields.validator';
 
 export class ContentField {
@@ -56,6 +57,7 @@ export class ContentTypeCreateDto {
   @ValidateNested({ each: true })
   @Validate(ValidateRequiredFields)
   @Type(() => ContentField)
+  @UniqueFieldNames()
   fields?: ContentField[];
 }
 
diff --git a/api/src/cms/schemas/content-type.schema.ts b/api/src/cms/schemas/content-type.schema.ts
index 6b6b3e43..fb1c1632 100644
--- a/api/src/cms/schemas/content-type.schema.ts
+++ b/api/src/cms/schemas/content-type.schema.ts
@@ -7,7 +7,6 @@
  */
 
 import { ModelDefinition, Prop, Schema, SchemaFactory } from '@nestjs/mongoose';
-import mongoose from 'mongoose';
 
 import { FieldType } from '@/setting/schemas/types';
 import { BaseSchema } from '@/utils/generics/base-schema';
@@ -28,7 +27,7 @@ export class ContentType extends BaseSchema {
    */
 
   @Prop({
-    type: mongoose.Schema.Types.Mixed,
+    type: [ContentField],
     default: [
       {
         name: 'title',
@@ -41,6 +40,25 @@ export class ContentType extends BaseSchema {
         type: FieldType.checkbox,
       },
     ],
+    required: true,
+    validate: {
+      /**
+       * Ensures every `name` in the fields array is unique.
+       * Runs on `save`, `create`, `insertMany`, and `findOneAndUpdate`
+       * when `runValidators: true` is set.
+       */
+      validator(fields: ContentField[]): boolean {
+        if (!Array.isArray(fields)) return false;
+        const seen = new Set<string>();
+        return fields.every((f) => {
+          if (seen.has(f.name)) return false;
+          seen.add(f.name);
+          return true;
+        });
+      },
+      message:
+        'Each element in "fields" must have a unique "name" (duplicate detected)',
+    },
   })
   fields: ContentField[];
 }
diff --git a/api/src/cms/validators/validate-unique-names.validator.ts b/api/src/cms/validators/validate-unique-names.validator.ts
new file mode 100644
index 00000000..3cc1c5d3
--- /dev/null
+++ b/api/src/cms/validators/validate-unique-names.validator.ts
@@ -0,0 +1,34 @@
+/*
+ * Copyright © 2025 Hexastack. All rights reserved.
+ *
+ * Licensed under the GNU Affero General Public License v3.0 (AGPLv3) with the following additional terms:
+ * 1. The name "Hexabot" is a trademark of Hexastack. You may not use this name in derivative works without express written permission.
+ * 2. All derivative works must include clear attribution to the original creator and software, Hexastack and Hexabot, in a prominent location (e.g., in the software's "About" section, documentation, and README file).
+ */
+
+import {
+  ValidationArguments,
+  ValidatorConstraint,
+  ValidatorConstraintInterface,
+} from 'class-validator';
+
+import { ContentField } from '../dto/contentType.dto';
+
+@ValidatorConstraint({ async: false })
+export class UniqueFieldNamesConstraint
+  implements ValidatorConstraintInterface
+{
+  validate(fields: ContentField[], _args: ValidationArguments) {
+    if (!Array.isArray(fields)) return false;
+    const seen = new Set<string>();
+    return fields.every((f) => {
+      if (seen.has(f.name)) return false;
+      seen.add(f.name);
+      return true;
+    });
+  }
+
+  defaultMessage(args: ValidationArguments) {
+    return `${args.property} contains duplicate "name" values; each field.name must be unique`;
+  }
+}