How to pass a variable in Json object while giving HTTP post request

Question

I am trying to pass the json object to one of my URLs which accepts the JSON data.

The below works:

payload='{"message": "hello"}'
headers = {'content-type': 'application/json', 'Accept-Charset': 'UTF-8'}
r = requests.post(url, data=payload, headers=headers)

r.text is giving me "hello"

But when I tried to pass the variable

s="hello"
payload='{"message":' +str(s)+ '}'
headers = {'content-type': 'application/json', 'Accept-Charset': 'UTF-8'}
r = requests.post(url, data=payload, headers=headers)

The above didnt work. When I tried to load as a JSON, it is throwing me error as well

payload=json.loads(payload)
JSONDecodeError: Expecting value: line 1 column 12 (char 11)

Also I wanted to pass b'blahblah' as a JSON message. Since passing a string didnt work for me, I didnt attempt to pass bytes format.

Please advice

Solution

You should include double quotes around the string in your JSON object:

payload='{"message":"' +str(s)+ '"}'

so that payload would become '{"message": "hello"}'.

Otherwise payload would become '{"message": hello}' with your current code.

Comments

[python_interest]

I dont know why this was down voted. This worked for me :) . Is it possible to send the bytes in JSON object ? For me the image is going to be my JSON. Is there any way to send bytes to JSON?

[blhsing]

JSON is meant for texts. You can encode images into texts with base64 if you insist though.