Question

Is there a way to easily extract the json data portion in the body of a POST request?
For example, if someone posts to http://www.example.com/post with the body of the form with json data, my GAE server will receive the request by calling:

jsonstr = self.request.body

However, when I look at the jsonstr, I get something like :

str: \r\n----------------------------8cf1c255b3bd7f2\r\nContent-Disposition: form-data;
name="Actigraphy"\r\n Content-Type: application/octet-
stream\r\n\r\n{"Data":"AfgCIwHGAkAB4wFYAZkBKgHwAebQBaAD.....

I just want to be able to call a function to extract the json part of the body which starts at the {“Data”:…… section.

Is there an easy function I can call to do this?

Answer 1

there is a misunderstanding, the string you show us is not json data, it looks like a POST body. You have to parse the body with something like cgi.parse_multipart.
Then you could parse json like answered by aschmid00. But instead of the body, you parse only the data.

Here you can find a working code that shows how to use cgi.FieldStorage for parsing the POST body.
This Question is also answered here..