如何在Python中将json字符串转换为dataframe

import pandas as pd
import json

json_str = '{"name": "John", "age": 30, "city": "New York"}'

data = json.loads(json_str)

df = pd.DataFrame(data, index=[0])

json_str = '[{"name": "John", "age": 30, "city": "New York", "skills": ["Python", "Java"]}, {"name": "Alice", "age": 25, "city": "London", "skills": ["C++", "JavaScript"]}]'

data = json.loads(json_str)
df = pd.json_normalize(data)