Access Multiselect Form Field in Flask

You want to use the getlist() function to get a list of values:

multiselect = request.form.getlist('mymultiselect')

You do not need to add [] to the name to make this work; in fact, the [] will not help, don't use it at all.

> In sometimes, If you are using Ajax POST method then check the parameter name in network tab. Check the image attached that describes how to verify the parameter names.

In Flask view:

you can access the list responce based on parameter name.

request.form.getlist('mymultiselect[]')

or

request.form.getlist('mymultiselect')