What to choose JsonProperty or StringProperty?

Question

I would like to store dict-like data in GAE NDB (will contain up to 100 keys):

{u'mail@example.com': 74, u'mail2@example.com': 1, u'mail3@example.com': 1, ...}

I was thinking about JsonProperty first, but once implemented, realized that it could not be read and edited in Datastore Viewer - <binary> is displayed instead. Should I use StringProperty then?

Answer 1

Yes, StringProperty is an option, in some cases. Use JSON.dumps() and JSON.loads() to convert.