object转json

const obj = {
    name: "John",
    age: 30,
    city: "New York"
};

const jsonString = JSON.stringify(obj);
console.log(jsonString); // 输出: {"name":"John","age":30,"city":"New York"}

import json

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

json_string = json.dumps(obj)
print(json_string)  # 输出: {"name": "John", "age": 30, "city": "New York"}

import com.fasterxml.jackson.databind.ObjectMapper;

public class Main {
    public static void main(String[] args) throws Exception {
        ObjectMapper mapper = new ObjectMapper();
        MyObject obj = new MyObject("John", 30, "New York");
        String jsonString = mapper.writeValueAsString(obj);
        System.out.println(jsonString);  // 输出: {"name":"John","age":30,"city":"New York"}
    }
}

class MyObject {
    private String name;
    private int age;
    private String city;

    public MyObject(String name, int age, String city) {
        this.name = name;
        this.age = age;
        this.city = city;
    }

    // Getters and setters
}

const circularObj = {};
circularObj.self = circularObj;

const seen = new WeakSet();
const jsonString = JSON.stringify(circularObj, (key, value) => {
    if (typeof value === "object" && value !== null) {
        if (seen.has(value)) {
            return "[Circular]";
        }
        seen.add(value);
    }
    return value;
});
console.log(jsonString);  // 输出: {"self":"[Circular]"}

import json

obj = {
    "name": "John",
    "description": "This is a description with special characters: \u00A9"
}

json_string = json.dumps(obj, ensure_ascii=False)
print(json_string)  # 输出: {"name": "John", "description": "This is a description with special characters: ©"}