如何对JSON进行编码？

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

const json = JSON.stringify(data);
console.log(json);

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

import json

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

json_data = json.dumps(data)
print(json_data)

import com.fasterxml.jackson.databind.ObjectMapper;

public class Main {
  public static void main(String[] args) throws Exception {
    ObjectMapper objectMapper = new ObjectMapper();
    String json = objectMapper.writeValueAsString(new Data("John", 30, "New York"));
    System.out.println(json);
  }
}

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

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

  // Getters and setters
}

$data = array(
  "name" => "John",
  "age" => 30,
  "city" => "New York"
);

$json = json_encode($data);
echo $json;