Submitting Form Data with aiohttp in Python

Mar 3, 2024 ยท 2 min read

When building web applications with the aiohttp library in Python, you'll often need to handle form data submitted from HTML forms. aiohttp makes this easy with some helpful tools for processing and validating user-entered form data.

Getting the Form Data

The first step is accessing the form data that was submitted. With aiohttp, this is available in the request object that is passed to route handlers:

async def handle_post(request):
    data = await

The post() method returns a dictionary with the form data. The keys are the names of the form fields, and the values are the submitted data.

You can also access files uploaded via the form with request.multipart(), which returns a MultipartReader.

Validating Form Data

Once you have the form data, validating user input is important. For example, check that required fields are entered and data formats are as expected.

The aiohttp library has some great validation tools like:

  • aiohttp.web.json_response() - Validates JSON data
  • aiohttp.web.Request.rel_url - Validates URLs
  • You can also leverage Python validation libraries like Pydantic to validate complex data.

    Storing Form Data

    After validation, you'll usually want to store or process the form data. For example, you could:

  • Save user-entered data to a database
  • Pass data to a Python function for processing
  • Use the data in an API request to another service
  • Be sure to properly handle any errors and provide user feedback!

    In Summary

  • Use and request.multipart() to access form data
  • Validate data to avoid issues
  • Store and process data after validation
  • Handle errors and provide user feedback
  • With these tips, you'll be a master at handling form data in aiohttp!

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