如何将JSON字符串转换为数字？

const jsonString = '{"number": 42}';
const jsonObject = JSON.parse(jsonString);
const number = Number(jsonObject.number);
console.log(number);

import json

json_string = '{"number": 42}'
json_object = json.loads(json_string)
number = float(json_object['number'])
print(number)

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

String jsonString = "{\"number\": 42}";
ObjectMapper objectMapper = new ObjectMapper();
JsonNode jsonNode = objectMapper.readTree(jsonString);
double number = jsonNode.get("number").asDouble();
System.out.println(number);