How to get html data with json api?

Yellow (profile info) can be regex'd out of original url response text.

Explore json here. The pattern r leads to extraction of string which can be loaded with json to produce dict containing all the info.

import requests
import json
import re

res = requests.get('https://www.khanacademy.org/profile/Viruslala/')
r = re.compile(r'profileInitOptions":(.*),"view"', re.DOTALL)
data = json.loads(r.findall(res.text)[0])
profile_data = data['profileData']
print(profile_data)

Notes:

The page loads the required content dynamically from a script tag when javascript runs on the page. As js does not run with requests you can still apply a regex pattern which grabs the javascript object housing the data of interest. You specify the pattern with:

r = re.compile(r'profileInitOptions":(.*),"view"', re.DOTALL)

then apply it to the response text, res.text, and extract the first returned match:

r.findall(res.text)[0]

In the case of this page, what is returned can be parsed with a json library:

json.loads(r.findall(res.text)[0])

The string is now in an dictionary object called data which you can access info from by key

data['profileData']

Regex:

re.DOTALL

Make the '.' special character match any character at all, including a newline; without this flag, '.' will match anything except a newline. Corresponds to the inline flag (?s).

What are you using to scrape the API? Urllib usually gets what you need

with urllib.request.urlopen("https://www.khanacademy.org/api/internal/user/kaid_896965538702696832878421/profile/widgets?lang=en&_=190427-0731-8941ef3f07bd_1556382106890") as url:
data = json.loads(url.read().decode())

From the API link it doesn't seem to contain any data for the userSummary, so there's nothing to scrape