Transform json to javascript object

Question

I'm trying to send a dict from python:


def toJsonCustom(self):

        ajson = []
        ajson.append({
        'id': self.id,
        'data': self.data
        })

        return json.dumps(

            ajson, default=lambda obj: obj.__dict__, separators=(',', ':'),indent=4,
        )



async def curl(url,data):
    async with aiohttp.ClientSession() as session:
        async with session.post(url, json={'datajson':data}) as response:
        print(repr(response))
            chunk = await response.content.read()
            print('Downloaded: %s' % len(chunk))



#output JSON: 

"{"datajson": "[\n    {\n        \"id\":\"test\",\n        \"data\":\"test\"\n    }\n]"}"

When trying to convert the output of this json into an object from javascript I get undefinied.

  const data = JSON.parse(get(props, 'websocket.data', null)) || get(state, 'websocket.data') || 'No data';


  console.log('Object json: ', (data));


# output: {"datajson": "[ n    { n         "id ": "test "  n         "data ": "test " n    } n]"}


  console.log('Object json: ', (data.id));

# output:undefined

How can I transform the json into a javascript object in a correct way?

Thank you,

I'm not very familiar with how python logs things but what you have under #output JSON is not json. Also: How to create a Minimal, Complete, and Verifiable example — Jabberwocky
– Jabberwocky, Commented May 3, 2019 at 15:56

ehacinom · Accepted Answer · 2019-05-03 15:52:36Z

1

I think you need data.datajson[0].id

answered May 3, 2019 at 15:52

ehacinom

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7 Comments

Francisco Over a year ago

Hi @ehacinom , I get the following: TypeError: Can not read property '0' of undefined. What is happening?

ehacinom Over a year ago

when debugging, try do parts at a time. So, first logging out console.log(data) is a good idea. next try console.log('datajson', data.datajson) (you don't need the parenthesis around the data). if that's undefined, you need to figure out the typeof your objects. Try typeof data, typeof data.datajson: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…

Francisco Over a year ago

console.log ('datajson', data.datajson) returns undefined. And when the json parses again, as @vassiliskrikonis says, I get: Unexpected token or in JSON at position 0

ehacinom Over a year ago

what does console.log(data) log? what about console.log(typeof data)

Francisco Over a year ago

console.log (data): {"datajson": "[\ n {\ n \" id \ ": \" test \ ", \ n \" value \ ": \" test \ "\ n} \ n]"} console.log (typeof data): string console.log ('datajson', data.datajson): datajson undefined . It seems that the JSON is well built. I have checked the data output from jsonformatter.curiousconcept.com I don't understand why I get undefined ...

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vassiliskrikonis · Accepted Answer · 2019-05-03 16:08:55Z

0

It seems that you need to parse the JSON string twice to get the object you need:

the first parse gives you the object { "datajson": "[{..." }, notice that the value of the datajson property is a string
so let's parse again the above object nestedData = JSON.parse(data.datajson)

answered May 3, 2019 at 16:08

vassiliskrikonis

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2 Comments

Francisco Over a year ago

I get: Unexpected token or in JSON at position 0

vassiliskrikonis Over a year ago

As I saw in a comment above, if data.datajson returns undefined then the issue is something else entirely. Try making a reproducible script as Jabberwocky commented you so we can help you :)

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