diff --git a/apps/api/src/app/import/import-data.dto.spec.ts b/apps/api/src/app/import/import-data.dto.spec.ts
new file mode 100644
index 0000000000..b6cce2a739
--- /dev/null
+++ b/apps/api/src/app/import/import-data.dto.spec.ts
@@ -0,0 +1,73 @@
+import { BadRequestException, ValidationPipe } from '@nestjs/common';
+import { DataSource, Type } from '@prisma/client';
+import { readFileSync } from 'node:fs';
+import { join } from 'node:path';
+
+import { ImportDataDto } from './import-data.dto';
+
+const validationPipe = new ValidationPipe({
+  forbidNonWhitelisted: true,
+  transform: true,
+  whitelist: true
+});
+
+function loadImportData(directory: string, fileName: string): ImportDataDto {
+  const { accounts, activities, assetProfiles, platforms, tags } = JSON.parse(
+    readFileSync(
+      join(__dirname, '../../../../../test/import', directory, fileName),
+      'utf8'
+    )
+  ) as ImportDataDto;
+
+  return { accounts, activities, assetProfiles, platforms, tags };
+}
+
+describe('ImportDataDto', () => {
+  it('accepts sample.json', async () => {
+    await expect(
+      validationPipe.transform(loadImportData('ok', 'sample.json'), {
+        metatype: ImportDataDto,
+        type: 'body'
+      })
+    ).resolves.toBeInstanceOf(ImportDataDto);
+  });
+
+  it.each([
+    {
+      fileName: 'invalid-data-source.json',
+      messages: [
+        `activities.0.dataSource must be one of the following values: ${Object.values(DataSource).join(', ')}`
+      ]
+    },
+    {
+      fileName: 'invalid-date-before-min.json',
+      messages: ['activities.0.date must be after 1970']
+    },
+    {
+      fileName: 'invalid-date.json',
+      messages: [
+        'activities.0.date must be after 1970',
+        'activities.0.date must be a valid ISO 8601 date string'
+      ]
+    },
+    {
+      fileName: 'invalid-type.json',
+      messages: [
+        `activities.0.type must be one of the following values: ${Object.values(Type).join(', ')}`
+      ]
+    }
+  ])('refuses $fileName', async ({ fileName, messages }) => {
+    const error: unknown = await validationPipe
+      .transform(loadImportData('not-ok', fileName), {
+        metatype: ImportDataDto,
+        type: 'body'
+      })
+      .catch((validationError: unknown) => validationError);
+
+    expect(error).toBeInstanceOf(BadRequestException);
+
+    expect((error as BadRequestException).getResponse()).toMatchObject({
+      message: messages
+    });
+  });
+});
diff --git a/apps/api/tsconfig.spec.json b/apps/api/tsconfig.spec.json
index e5f982722c..63aa6d4f95 100644
--- a/apps/api/tsconfig.spec.json
+++ b/apps/api/tsconfig.spec.json
@@ -2,6 +2,7 @@
   "extends": "./tsconfig.json",
   "compilerOptions": {
     "outDir": "../../dist/out-tsc",
+    "target": "es2021",
     "module": "preserve",
     "types": ["jest", "node"]
   },