Downloading a template with render_word_file()


I have some problems generating en downloading a Word file.

This is the error message I am getting:

  File "viktor\external\word.pyx", line 182, in viktor.external.word.render_word_file
  File "viktor\external\word.pyx", line 205, in viktor.external.word._create_fill_word_file_request_body
  File "C:\Program Files\Python38\lib\json\", line 231, in dumps
    return _default_encoder.encode(obj)
  File "C:\Program Files\Python38\lib\json\", line 199, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "C:\Program Files\Python38\lib\json\", line 257, in iterencode
    return _iterencode(o, 0)
  File "C:\Program Files\Python38\lib\json\", line 179, in default
    raise TypeError(f'Object of type {o.__class__.__name__} '
TypeError: Object of type type is not JSON serializable

And this is a part of the code I am using:

def generate_report(params):
    entity_folder_path = Path(__file__).parent  # entity_type_a
    template_path = entity_folder_path.parent / 'template_calc_report.docx'
    components = [
        WordFileTag('project_name', 'test'),
        WordFileTag('project_number', '01234456'),
        WordFileTag('report_date', date),
        WordFileTag('report_time', time),

    with open(template_path, 'rb') as template:
        word_file = render_word_file(template, components)
    return word_file

def download_file(self, params, **kwargs):
    return DownloadResult(generate_report(params), 'report.docx')

What are date and time in your code? My first guess would be that the problem is in there. Can you try to remove these 2 specific WordFileTags and re-try? Can you print(date, time) to verify that these are really instances of the classes you would expect?

Thanks that was the problem. It is solved now.