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I am using the file_picker plugin to pick a CSV file in Flutter Web. Although I am able to pick the file it is converting the file into bytes (Uint8List). Is there any way I can get the original CSV file or if I can convert these bytes to CSV maybe I can get the path of the file?

Code:

 void pickCSV() async {
    FilePickerResult? result = await FilePicker.platform.pickFiles(type: FileType.custom, allowedExtensions: ['csv']);
    if (result != null) {
      var fileBytes = result.files.first.bytes;
      csfFileName.value = result.files.first.name;
    } else {
      // User canceled the picker
    }
  }
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I know it's a bit late but you have a couple of choices and maybe it helps others out aswell.

Both of the choices requires server-side processing, so you will need to read on how to do that.

  1. Get the content of the CSV file send it to the server and make a new file on the server with that content. You can use String.fromCharCodes to read the content, in the web, after you select the file.

  2. Convert the Uint8List into a base64 string, using base64Encode function, send it to the server, process it there.

Alternatively, if you use Firebase Storage you can use putData like so:

final metaData = SettableMetadata(contentType: mimeType);
final task = await _storage.ref().child(cloudPath).putData(fileData, metaData);
/// Get the URL
await task.ref.getDownloadURL()
  • Storing the mimeType ensures proper handling of the file when used after download
  • cloudPath means the location in FirebaseStorage, such as: storageDirectory/filename.extension
  • fileData is the Uint8List you provided
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