CODEWITHSUNDEEP
pythonjsonrequest
eljiwo
eljiwo

Reputation: 846

Parse json encoded attributes from request body

I'm json encoding an attribute in POST data request (due to it being a list of Sending list of dicts as value of dict with requests.post going wrong ) but I'm having trouble reading it back.

In my endpoint when I receive the request the body looks like this:

The post request is done like this:

params = {
    "listofdicts": json.dumps([
         {"variable": "1"},
         {"variable": "2"},
         {"variable": "3"},
         {"variable": "4"},
     ]),
     "number": 5,
}

request.request("POST", ... , data=params)

I should be able to read the body to get the original params

params = {
    "listofdicts": json.dumps([
         {"variable": "1"},
         {"variable": "2"},
         {"variable": "3"},
         {"variable": "4"},
     ]),
     "number": 5,
}

After reading Trying to parse `request.body` from POST in Django I tried to do:

body = json.loads(event["body"])
listofdicts = json.loads(body["listofdicts"])
number = body["number"]

But it fails on the first line with

body = json.loads(event["body"])  
File "/var/lang/lib/python3.9/json/__init__.py", line 346, in loads     return _default_decoder.decode(s)   File "/var/lang/lib/python3.9/json/decoder.py", line 337, in decode     obj, end = self.raw_decode(s, idx=_w(s, 0).end())   File "/var/lang/lib/python3.9/json/decoder.py", line 355, in raw_decode     raise JSONDecodeError("Expecting value", s, err.value) from None

The event["body"] string looks like this:

{'body': 'listofdicts=%5B%7B%22variable%22%3A+%221%22%7D%2C+%7B%22variable%22%3A+%222%22%7D%2C+%7B%22variable%22%3A+%223%22%7D%2C+%7B%22variable%22%3A+%224%22%7D%5D&number=5'}

How can I decode this body?

Upvotes: 1

Views: 981

Answers (1)

eljiwo
eljiwo

Reputation: 846

Turns out the body content was URL-encoded and that would need to decode it as Url decode UTF-8 in Python says.

Other option to avoid request library url-encoding your data body is to use a full json as the data object. So doing:

params = {
    "listofdicts": [
         {"variable": "1"},
         {"variable": "2"},
         {"variable": "3"},
         {"variable": "4"},
     ],
     "number": 5,
}
params = json.dump(params)

Fixed it too as now the body became a str loadable from json.loads(): '{"listofdicts": [{"variable": "1"}, {"variable": "2"}, {"variable": "3"}, {"variable": "4"}], "number": 5}'

Upvotes: 1

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