diff --git a/src/form/form.controller.ts b/src/form/form.controller.ts
index 335712a..c98e3ab 100644
--- a/src/form/form.controller.ts
+++ b/src/form/form.controller.ts
@@ -13,15 +13,16 @@ import { ApiOperation } from '@nestjs/swagger';
 import { UpdateFieldDto } from './dto/update-field.dto';
 import { QueryFormDto } from './dto/query-form.dto';
 import { CreateFormDto } from './dto/create-form.dto';
+import { CreateFieldDto } from './dto/create-field.dto';
 
 @Controller('form')
 export class FormController {
   constructor(private readonly formService: FormService) {}
 
   @Post('create-form')
-  @ApiOperation({ summary: 'Create a Form'})
-  async createOne(@Body() createFormDto:CreateFormDto){
-    return await this.formService.createForm(createFormDto)
+  @ApiOperation({ summary: 'Create a Form' })
+  async createOne(@Body() createFormDto: CreateFormDto) {
+    return await this.formService.createForm(createFormDto);
   }
 
   @Get()
@@ -36,11 +37,20 @@ export class FormController {
     return await this.formService.find(formId);
   }
   @Get(':formId/interface')
-  @ApiOperation({summary:'Get interface for the form provided by llm'})
-  async getInterface(@Param('formId') formId:string){
+  @ApiOperation({ summary: 'Get interface for the form provided by llm' })
+  async getInterface(@Param('formId') formId: string) {
     return await this.formService.findInterface(formId);
   }
 
+  @Patch(':formId/field')
+  @ApiOperation({ summary: 'Add a field to a form' })
+  async addField(
+    @Param('formId') formId: string,
+    @Body() createFieldDto: CreateFieldDto,
+  ) {
+    return await this.formService.addField(formId, createFieldDto);
+  }
+
   @Patch(':id/fields/:fieldId')
   @ApiOperation({ summary: 'update a field in a form' })
   async updateField(
diff --git a/src/form/form.service.ts b/src/form/form.service.ts
index c29ec70..72a0e8f 100644
--- a/src/form/form.service.ts
+++ b/src/form/form.service.ts
@@ -13,6 +13,8 @@ import { FormQueryBuilder } from './helpers/form-query.builder';
 import { PaginatedResponse } from 'src/interfaces/paginated-response.interface';
 import { LlmService } from 'src/common/services/llm.service';
 import { CreateFormDto } from './dto/create-form.dto';
+import { CreateFieldDto } from './dto/create-field.dto';
+import { threadCpuUsage } from 'process';
 
 // Reusable projections
 const LIST_PROJECTION = {
@@ -40,6 +42,16 @@ export class FormService {
     return form;
   }
 
+  async addField(formId: string, fieldDto: CreateFieldDto): Promise<Form> {
+    const updatedForm = await this.formModel.findOneAndUpdate(
+      { id: formId },
+      { $push: { fields: fieldDto } },
+      { returnDocument: 'after' }, //as {new:true} will be deprecated
+    );
+    if (!updatedForm) throw new NotFoundException(`Form ${formId} not found`);
+    return updatedForm;
+  }
+
   async findAll(query: QueryFormDto): Promise<PaginatedResponse<Form>> {
     const filter = FormQueryBuilder.buildFilter(query);
     const sort = FormQueryBuilder.buildSort(query);
@@ -113,7 +125,7 @@ export class FormService {
       { id: formId },
       { $set: setPayload },
       {
-        new: true,
+        returnDocument: 'after',
         arrayFilters: [{ 'elem.id': fieldId }],
         projection: DETAIL_PROJECTION,
       },
@@ -126,7 +138,7 @@ export class FormService {
     const form = await this.formModel.findOneAndUpdate(
       { id: formId },
       { $pull: { fields: { id: fieldId } } },
-      { new: true, projection: DETAIL_PROJECTION },
+      { returnDocument: 'after', projection: DETAIL_PROJECTION },
     );
     if (!form) throw new NotFoundException(`Form ${formId} not found`);
     return form;
@@ -140,7 +152,7 @@ export class FormService {
           deletedAt: new Date(),
         },
       },
-      { new: true, projection: DETAIL_PROJECTION },
+      { returnDocument: 'after', projection: DETAIL_PROJECTION },
     );
 
     if (!form) throw new NotFoundException(`Form ${FormId} not found`);
@@ -155,7 +167,7 @@ export class FormService {
           deletedAt: null,
         },
       },
-      { new: true, projection: DETAIL_PROJECTION },
+      { returnDocument: 'after', projection: DETAIL_PROJECTION },
     );
     if (!form) throw new NotFoundException(`Form ${FormId} not found`);
     return form;