diff --git a/packages/xlsx-import/src/ImporterFactory.ts b/packages/xlsx-import/src/ImporterFactory.ts
index 35d1ae9..72f0aaf 100644
--- a/packages/xlsx-import/src/ImporterFactory.ts
+++ b/packages/xlsx-import/src/ImporterFactory.ts
@@ -1,12 +1,17 @@
-import { Workbook } from 'exceljs';
-import IImporterLegacy, { IImporter } from './IImporter';
+import { Buffer, Workbook } from 'exceljs';
+import { IImporter } from './IImporter';
 import ImporterLegacy, { Importer } from './Importer';
 
 export class ImporterFactory {
     public async from(path: string): Promise<IImporter> {
         const wb = new Workbook();
         await wb.xlsx.readFile(path);
+        return new Importer(wb);
+    }
 
+    public async fromBuffer(buffer: Buffer): Promise<IImporter> {
+        const wb = new Workbook();
+        await wb.xlsx.load(buffer);
         return new Importer(wb);
     }
 }
diff --git a/packages/xlsx-import/src/mappers/dateMapper.ts b/packages/xlsx-import/src/mappers/dateMapper.ts
index ad72f86..858ffcc 100644
--- a/packages/xlsx-import/src/mappers/dateMapper.ts
+++ b/packages/xlsx-import/src/mappers/dateMapper.ts
@@ -1,4 +1,4 @@
 import { ValueMapper } from '../abstracts/ValueMapper';
 
 // noinspection SuspiciousTypeOfGuard
-export const dateMapper: ValueMapper<Date> = value => new Date(typeof value === "string" ? value : "invalid");
+export const dateMapper: ValueMapper<Date> = value => new Date(typeof value === 'string' ? value : 'invalid');
diff --git a/packages/xlsx-import/tests/integration/object-single-items.test.ts b/packages/xlsx-import/tests/integration/object-single-items.test.ts
index d77b2e3..d2bbcac 100644
--- a/packages/xlsx-import/tests/integration/object-single-items.test.ts
+++ b/packages/xlsx-import/tests/integration/object-single-items.test.ts
@@ -1,7 +1,8 @@
 import * as chai from 'chai';
 import { ImportType } from '../../src/config/ImportType';
-
 import { ImporterFactory } from '../../src/ImporterFactory';
+import path from 'path';
+import { readFileSync } from 'fs';
 
 describe('reading sigle items (objects)', () => {
     const configs = {
@@ -26,7 +27,18 @@ describe('reading sigle items (objects)', () => {
         chai.expect(result).eql(expected);
         chai.expect(result.length).equals(1);
     });
+    it('getAllItems should return one correct object from buffer', async () => {
+        const factory = new ImporterFactory();
+        const filePath = path.resolve(__dirname, '../data/', 'marsjanie-db.xlsx');
+        const buffer = readFileSync(filePath);
+        const importer = await factory.fromBuffer(buffer);
+        const result = importer.getAllItems(configs.author);
+
+        const expected = [{ firstName: 'Marian', secondName: 'Marianacki', age: 123, city: 'Pila-wojenna' }];
 
+        chai.expect(result).eql(expected);
+        chai.expect(result.length).equals(1);
+    });
     const definedTypesAsString = ['object', 'single', 'singleton'];
     definedTypesAsString.forEach(type => {
         it(`for type (as string) '${type}' getAllItems should return one correct object`, async () => {
diff --git a/packages/xlsx-import/tests/unit/mappers/dateMapper.ts b/packages/xlsx-import/tests/unit/mappers/dateMapper.ts
index a68c33d..badc1ec 100644
--- a/packages/xlsx-import/tests/unit/mappers/dateMapper.ts
+++ b/packages/xlsx-import/tests/unit/mappers/dateMapper.ts
@@ -5,7 +5,10 @@ describe('UNIT TEST: src/mappers/', () => {
     describe('dateMapper', () => {
         const dataProvider = [
             // data time
-            { inValue: 'Thu Oct 08 2020 02:00:00 GMT+0200 (Central European Summer Time)', expectedResult: 1602115200000 },
+            {
+                inValue: 'Thu Oct 08 2020 02:00:00 GMT+0200 (Central European Summer Time)',
+                expectedResult: 1602115200000,
+            },
             { inValue: 'Thu Jan 30 1750 02:00:00 GMT-0900', expectedResult: -6939954000000 },
             { inValue: 'Thu Jan 30 3125', expectedResult: 36450774000000 },