Best way to handle JSON arrays of fields?

[maxcountryman]

I have some JSON that looks like this {'images': [{'name': 'field-1', 'value': 'http://example.com/foo'}, {'name': 'field-2', 'value': 'http://example.com/bar'}, ...]}.

What I'd like to know is what is the best way to validate each of these name-value pairs as though they were fields? In particular, I need them to be optional and valid URLs.

[maxcountryman]

So I think I was able to solve this like so (assume we've imported the necessary classes here):

class ImageForm(wtforms.Form):
    name = wtforms.TextField('name')
    value = wtforms.TextField('value', [wtforms.validators.Optional(), ...])


class ImagesForm(wtforms.Form):
    images = wtforms.FieldList(wtforms.FormField(ImageForm))

However field errors do not map back to the input names, which are dynamically generated on the front-end, e.g. field-1 where 1 is the ID of an object in our database.

Suggestions?