title: Download/upload to laravel CSV
body: <h1>Setup</h1>
  <ul>
  <li>Laravel 9.x</li>
  <li>Ubuntu Server</li>
  </ul>
  <h1>Background</h1>
  <p>I've created an inventory system for my client to manage/update their costs. Several of them wanted a mass upload/download system using CSV as it's how they preferred to work. Using a basic CSV export and import script I created this. However there is an obscure bug I would like to resolve.</p>
  <p>I noticed it when I did an export followed by an immediate import. The laravel validation refused this, claiming it was not a CSV. Of course this has been importing successfully into Excel, so I investigated.</p>
  <p>The MIME type of the exported file is not <code>text/csv</code> when exported from laravel.</p>
  <h1>Question</h1>
  <p>How do I correctly export data as a CSV so that it saves correctly without a third party program &quot;fixing it for me&quot;.</p>
  <p>Edit: fie creation is as follows:</p>
  <pre class="lang-php prettyprint-override"><code>
          // create a csv
          $path = storage_path('app/uploads');
          $filename = 'parts.csv';
          $file = fopen($path . '/' . $filename, &quot;w&quot;);
  
          // ...
          // a loop of adding $content using: fwrite($file, $content);
  
          fclose($file);
  
  </code></pre>
  <p>The current export is as follows:</p>
  <pre class="lang-php prettyprint-override"><code>
      // $path, $filename etc already set up
  
          return Response::download(
              $path . '/' . $filename,
              $filename,
              [
                  'Content-Type: text/csv',
                  'Content-Disposition&quot; =&gt; &quot;attachment; filename=' . $filename
              ]
          );
  
  </code></pre>
  <p>This creates a file that if immediately exported, has a basic text MIME type which gets rejected by a CSV validation.</p>
  <p>Thanks all.</p>