first upload all files

Modules/Import/Config/assets.php

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+<?php
+
+return [
+    /*
+    |--------------------------------------------------------------------------
+    | Define which assets will be available through the asset manager
+    |--------------------------------------------------------------------------
+    | These assets are registered on the asset manager
+    */
+    'all_assets' => [
+        'admin.import.js' => ['module' => 'import:admin/js/importer.js'],
+    ],
+];

Modules/Import/Config/permissions.php

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+<?php
+
+return [
+    'admin.importer' => [
+        'index' => 'import::permissions.index',
+        'create' => 'import::permissions.create',
+    ],
+];

Modules/Import/Http/Controllers/Admin/DownloadCsvController.php

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+<?php
+
+namespace Modules\Import\Http\Controllers\Admin;
+
+class DownloadCsvController
+{
+    /**
+     * Display a listing of the resource.
+     *
+     * @return \Illuminate\Http\Response
+     */
+    public function index()
+    {
+        $import_types = ['product' => 'products.csv'];
+
+        if (array_key_exists(request('import_type'), $import_types)) {
+            $path = storage_path('app/csv_templates/' . $import_types[request('import_type')]);
+
+            return response()->download($path);
+        }
+    }
+}

Modules/Import/Http/Controllers/Admin/ImporterController.php

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+<?php
+
+namespace Modules\Import\Http\Controllers\Admin;
+
+use Maatwebsite\Excel\Excel;
+use Modules\Import\Imports\ProductImport;
+use Maatwebsite\Excel\Facades\Excel as ExcelFacade;
+use Modules\Import\Http\Requests\StoreImporterRequest;
+
+class ImporterController
+{
+    /**
+     * Display a listing of the resource.
+     *
+     * @return \Illuminate\Http\Response
+     */
+    public function index()
+    {
+        return view('import::admin.importer.index');
+    }
+
+    /**
+     * Store a newly created resource in storage.
+     *
+     * @param \Modules\Import\Http\Requests\StoreImporterRequest $request
+     * @return \Illuminate\Http\Response
+     */
+    public function store(StoreImporterRequest $request)
+    {
+        @set_time_limit(0);
+
+        $importers = ['product' => ProductImport::class];
+
+        ExcelFacade::import(new $importers[$request->import_type], $request->file('csv_file'), null, Excel::CSV);
+
+        if (session()->has('importer_errors')) {
+            return back()->with('error', trans('import::messages.there_was_an_error_on_rows', [
+                'rows' => implode(', ', session()->pull('importer_errors', [])),
+            ]));
+        }
+
+        return back()->with('success', trans('import::messages.the_importer_has_been_run_successfully'));
+    }
+}

Modules/Import/Http/Requests/StoreImporterRequest.php

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+<?php
+
+namespace Modules\Import\Http\Requests;
+
+use Illuminate\Validation\Rule;
+use Modules\Core\Http\Requests\Request;
+
+class StoreImporterRequest extends Request
+{
+    /**
+     * Available attributes.
+     *
+     * @var string
+     */
+    protected $availableAttributes = 'import::attributes';
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array
+     */
+    public function rules()
+    {
+        return [
+            'import_type' => ['required', Rule::in(['product'])],
+            'csv_file' => ['required', 'file', 'mimes:csv,txt'],
+        ];
+    }
+}

Modules/Import/Imports/ProductImport.php

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+<?php
+
+namespace Modules\Import\Imports;
+
+use Maatwebsite\Excel\Row;
+use Illuminate\Support\Collection;
+use Modules\Product\Entities\Product;
+use Illuminate\Database\QueryException;
+use Maatwebsite\Excel\Concerns\OnEachRow;
+use Illuminate\Validation\ValidationException;
+use Maatwebsite\Excel\Concerns\WithHeadingRow;
+use Maatwebsite\Excel\Concerns\WithChunkReading;
+
+class ProductImport implements OnEachRow, WithChunkReading, WithHeadingRow
+{
+    public function chunkSize(): int
+    {
+        return 200;
+    }
+
+    public function onRow(Row $row)
+    {
+        $data = $this->normalize($row->toArray());
+
+        request()->merge($data);
+
+        try {
+            Product::create($data);
+        } catch (QueryException | ValidationException $e) {
+            session()->push('importer_errors', $row->getIndex());
+        }
+    }
+
+    private function normalize(array $data)
+    {
+        return array_filter([
+            'name' => $data['name'],
+            'sku' => $data['sku'],
+            'description' => $data['description'],
+            'short_description' => $data['short_description'],
+            'is_active' => $data['active'],
+            'brand_id' => $data['brand'],
+            'categories' => $this->explode($data['categories']),
+            'tax_class_id' => $data['tax_class'],
+            'tags' => $this->explode($data['tags']),
+            'price' => $data['price'],
+            'special_price' => $data['special_price'],
+            'special_price_type' => $data['special_price_type'],
+            'special_price_start' => $data['special_price_start'],
+            'special_price_end' => $data['special_price_end'],
+            'manage_stock' => $data['manage_stock'] ?? 0, //bug fix
+            'qty' => $data['quantity'],
+            'in_stock' => $data['in_stock'] ?? 1, //bug fix
+            'new_from' => $data['new_from'],
+            'new_to' => $data['new_to'],
+            'up_sells' => $this->explode($data['up_sells']),
+            'cross_sells' => $this->explode($data['cross_sells']),
+            'related_products' => $this->explode($data['related_products']),
+            'files' => $this->normalizeFiles($data),
+            'meta' => $this->normalizeMetaData($data),
+            'attributes' => $this->normalizeAttributes($data),
+            'options' => $this->normalizeOptions($data),
+        ], function ($value) {
+            return $value || is_numeric($value);
+        });
+    }
+
+    private function explode($values)
+    {
+        if (trim($values) == '') {
+            return false;
+        }
+
+        return array_map('trim', explode(',', $values));
+    }
+
+    private function normalizeFiles(array $data)
+    {
+        return [
+            'base_image' => $data['base_image'],
+            'additional_images' => $this->explode($data['additional_images']),
+        ];
+    }
+
+    private function normalizeMetaData($data)
+    {
+        return [
+            'meta_title' => $data['meta_title'],
+            'meta_description' => $data['meta_description'],
+        ];
+    }
+
+    private function normalizeAttributes(array $data)
+    {
+        $attributes = [];
+
+        foreach ($this->findAttributes($data) as $attributeNumber => $attributeId) {
+            $attributes[] = [
+                'attribute_id' => $attributeId,
+                'values' => $this->findAttributeValues($data, $attributeNumber),
+            ];
+        }
+
+        return $attributes;
+    }
+
+    private function findAttributes(array $data)
+    {
+        return collect($data)->filter(function ($value, $column) {
+            preg_match('/^attribute_\d$/', $column, $matches);
+
+            return ! empty($matches);
+        })->filter();
+    }
+
+    private function findAttributeValues(array $data, $attributeNumber)
+    {
+        return collect($data)->filter(function ($value, $column) use ($attributeNumber) {
+            return $column === "{$attributeNumber}_values";
+        })->map(function ($values) {
+            return $this->explode($values);
+        })->flatten()->toArray();
+    }
+
+    private function normalizeOptions(array $data)
+    {
+        $options = [];
+
+        foreach ($this->findOptionPrefixes($data) as $optionPrefix) {
+            $option = $this->findOptionAttributes($data, $optionPrefix);
+
+            if (is_null($option['name'])) {
+                continue;
+            }
+
+            $options[] = [
+                'name' => $option['name'],
+                'type' => $option['type'],
+                'is_required' => $option['is_required'],
+                'values' => $this->findOptionValues($option),
+            ];
+        }
+
+        return $options;
+    }
+
+    private function findOptionPrefixes(array $data)
+    {
+        return collect($data)->filter(function ($value, $column) {
+            preg_match('/^option_\d_name$/', $column, $matches);
+
+            return ! empty($matches);
+        })->keys()->map(function ($column) {
+            return str_replace('_name', '', $column);
+        });
+    }
+
+    private function findOptionAttributes(array $data, $optionPrefix)
+    {
+        return collect($data)->filter(function ($value, $column) use ($optionPrefix) {
+            preg_match("/{$optionPrefix}_.*/", $column, $matches);
+
+            return ! empty($matches);
+        })->mapWithKeys(function ($value, $column) use ($optionPrefix) {
+            $column = str_replace("{$optionPrefix}_", '', $column);
+
+            return [$column => $value];
+        });
+    }
+
+    private function findOptionValues(Collection $option)
+    {
+        $values = [];
+
+        foreach ($this->findOptionValuePrefixes($option) as $valuePrefix) {
+            $value = $this->findOptionValueAttributes($option, $valuePrefix);
+
+            if (is_null($value['label'])) {
+                continue;
+            }
+
+            $values[] = [
+                'label' => $value['label'],
+                'price' => $value['price'],
+                'price_type' => $value['price_type'],
+            ];
+        }
+
+        return $values;
+    }
+
+    private function findOptionValuePrefixes(Collection $option)
+    {
+        return $option->filter(function ($value, $column) {
+            preg_match('/value_\d_.+/', $column, $matches);
+
+            return ! empty($matches);
+        })->keys()->map(function ($column) {
+            preg_match('/value_\d/', $column, $matches);
+
+            return $matches[0];
+        })->unique();
+    }
+
+    private function findOptionValueAttributes(Collection $option, $valuePrefix)
+    {
+        return $option->filter(function ($value, $column) use ($valuePrefix) {
+            preg_match("/{$valuePrefix}_.*/", $column, $matches);
+
+            return ! empty($matches);
+        })->mapWithKeys(function ($value, $column) use ($valuePrefix) {
+            $column = str_replace("{$valuePrefix}_", '', $column);
+
+            return [$column => $value];
+        })->toArray();
+    }
+}

Modules/Import/Providers/ImportServiceProvider.php

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+<?php
+
+namespace Modules\Import\Providers;
+
+use Modules\Support\Traits\AddsAsset;
+use Illuminate\Support\ServiceProvider;
+
+class ImportServiceProvider extends ServiceProvider
+{
+    use AddsAsset;
+
+    /**
+     * Bootstrap the application services.
+     *
+     * @return void
+     */
+    public function boot()
+    {
+        $this->addAdminAssets('admin.importer.index', ['admin.import.js']);
+    }
+}

Modules/Import/Resources/assets/admin/js/main.js

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+$('.btn-actions').on('click', (e) => {
+    e.preventDefault();
+
+    let importType = $('#import_type').val();
+
+    window.location.href = route('admin.download_csv.index', { import_type: importType });
+});

Modules/Import/Resources/lang/en/attributes.php

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+<?php
+
+return [
+    'csv_file' => 'CSV File',
+    'import_type' => 'Import Type',
+];

Modules/Import/Resources/lang/en/importer.php

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+<?php
+
+return [
+    'importer' => 'Importer',
+    'download_csv' => 'Download CSV',
+    'import' => 'Import',
+    'import_types' => [
+        'product' => 'Product',
+    ],
+    'run' => 'Run',
+];

Modules/Import/Resources/lang/en/messages.php

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+<?php
+
+return [
+    'the_importer_has_been_run_successfully' => 'The importer has been run successfully.',
+    'there_was_an_error_on_rows' => 'There was an error on rows (:rows).',
+];

Modules/Import/Resources/lang/en/permissions.php

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+<?php
+
+return [
+    'index' => 'Index Import',
+    'create' => 'Create Import',
+];

Modules/Import/Resources/lang/en/sidebar.php

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+<?php
+
+return [
+    'import' => 'Importer',
+];

Modules/Import/Resources/views/admin/importer/index.blade.php

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+@extends('admin::layout')
+
+@component('admin::components.page.header')
+    @slot('title', trans('import::importer.importer'))
+
+    <li class="active">{{ trans('import::importer.importer') }}</li>
+@endcomponent
+
+@section('content')
+	<div class="row">
+        <div class="btn-group pull-right">
+            <a href="#" class="btn btn-primary btn-actions">
+                {{ trans('import::importer.download_csv') }}
+            </a>
+        </div>
+    </div>
+
+    <form method="POST" action="{{ route('admin.importer.store') }}" enctype="multipart/form-data" class="form-horizontal">
+        @csrf
+
+    	<div class="accordion-content">
+    		<div class="accordion-box-content clearfix">
+    			<div class="col-md-12">
+    				<div class="accordion-box-content">
+    					<div class="tab-content clearfix">
+    						<div class="tab-pane fade in active">
+    							<h3 class="tab-content-title">
+                                    {{ trans('import::importer.import') }}
+                                </h3>
+
+    							<div class="row">
+    							    <div class="col-lg-6 col-md-12">
+                                        {{ Form::file('csv_file', trans('import::attributes.csv_file'), $errors, null, ['required' => true]) }}
+                                        {{ Form::select('import_type', trans('import::attributes.import_type'), $errors, trans('import::importer.import_types'), null, ['required' => true]) }}
+
+		    							<div class="form-group">
+		    							    <div class="col-md-offset-3 col-md-10">
+		    							        <button type="submit" class="btn btn-primary" data-loading>
+		    							            {{ trans('import::importer.run') }}
+		    							        </button>
+		    							    </div>
+		    							</div>
+    							    </div>
+    							</div>
+    						</div>
+    					</div>
+    				</div>
+    			</div>
+    		</div>
+    	</div>
+    </form>
+@endsection

Modules/Import/Routes/admin.php

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+<?php
+
+use Illuminate\Support\Facades\Route;
+
+Route::get('importer', [
+    'as' => 'admin.importer.index',
+    'uses' => 'ImporterController@index',
+    'middleware' => 'can:admin.importer.index',
+]);
+
+Route::post('importer', [
+    'as' => 'admin.importer.store',
+    'uses' => 'ImporterController@store',
+    'middleware' => 'can:admin.importer.create',
+]);
+
+Route::get('download-csv', [
+    'as' => 'admin.download_csv.index',
+    'uses' => 'DownloadCsvController@index',
+    'middleware' => 'can:admin.importer.index',
+]);

Modules/Import/Sidebar/SidebarExtender.php

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+<?php
+
+namespace Modules\Import\Sidebar;
+
+use Maatwebsite\Sidebar\Item;
+use Maatwebsite\Sidebar\Menu;
+use Maatwebsite\Sidebar\Group;
+use Modules\Admin\Sidebar\BaseSidebarExtender;
+
+class SidebarExtender extends BaseSidebarExtender
+{
+    public function extend(Menu $menu)
+    {
+        $menu->group(trans('admin::sidebar.system'), function (Group $group) {
+            $group->item(trans('admin::sidebar.tools'), function (Item $item) {
+                $item->item(trans('import::sidebar.import'), function (Item $item) {
+                    $item->weight(5);
+                    $item->route('admin.importer.index');
+                    $item->authorize(
+                        $this->auth->hasAccess('admin.importer.index')
+                    );
+                });
+            });
+        });
+    }
+}

Modules/Import/composer.json

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+{
+    "name": "fleetcart/import",
+    "description": "The FleetCart Import Module.",
+    "authors": [
+        {
+            "name": "Envay Soft",
+            "email": "envaysoft@gmail.com"
+        }
+    ],
+    "require": {
+        "php": "^8.0.2",
+        "maatwebsite/excel": "^3.1"
+    },
+    "autoload": {
+        "psr-4": {
+            "Modules\\Import\\": ""
+        }
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "1.0.x-dev"
+        }
+    },
+    "config": {
+        "sort-packages": true
+    },
+    "minimum-stability": "dev"
+}

Modules/Import/module.json

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+{
+    "name": "Import",
+    "alias": "import",
+    "description": "The FleetCart Import Module.",
+    "priority": 100,
+    "providers": [
+        "Modules\\Import\\Providers\\ImportServiceProvider"
+    ]
+}

Modules/Import/webpack.mix.js

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+let mix = require('laravel-mix');
+
+mix.js(`${__dirname}/Resources/assets/admin/js/main.js`, `${__dirname}/Assets/admin/js/importer.js`);