JSONエディタ

// JSON Serialization - Convert JavaScript object to JSON string
const user = {
  id: 1,
  name: "John Doe",
  email: "[email protected]",
  isActive: true,
  tags: ["developer", "frontend"]
};

// Convert to JSON string
const jsonString = JSON.stringify(user);
console.log(jsonString);
// Output: {"id":1,"name":"John Doe","email":"[email protected]","isActive":true,"tags":["developer","frontend"]}

// JSON Deserialization - Convert JSON string to JavaScript object
const jsonData = '{"id":1,"name":"John Doe","email":"[email protected]","isActive":true,"tags":["developer","frontend"]}';

try {
  // Parse JSON string
  const user = JSON.parse(jsonData);
  console.log(user.name); // Output: John Doe
  console.log(user.tags); // Output: ["developer", "frontend"]
} catch (error) {
  console.error('JSON parsing error:', error.message);
}

import json

# JSON Serialization - Convert Python dictionary to JSON string
user = {
    "id": 1,
    "name": "John Doe",
    "email": "[email protected]",
    "is_active": True,
    "tags": ["developer", "backend"]
}

# Convert to JSON string
json_string = json.dumps(user, indent=2)
print(json_string)
# Output formatted JSON string

import json

# JSON Deserialization - Convert JSON string to Python object
json_data = '{"id":1,"name":"John Doe","email":"[email protected]","is_active":true,"tags":["developer","backend"]}'

try:
    # Parse JSON string
    user = json.loads(json_data)
    print(user["name"])  # Output: John Doe
    print(user["tags"])  # Output: ['developer', 'backend']
except json.JSONDecodeError as e:
    print(f"JSON parsing error: {e}")

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.core.JsonProcessingException;

// User class definition
public class User {
    private int id;
    private String name;
    private String email;
    private boolean isActive;
    private String[] tags;
    
    // Constructor, getters and setters...
}

// JSON Serialization - Convert Java object to JSON string
ObjectMapper mapper = new ObjectMapper();
User user = new User(1, "John Doe", "[email protected]", true, new String[]{"developer", "Java"});

try {
    String jsonString = mapper.writeValueAsString(user);
    System.out.println(jsonString);
} catch (JsonProcessingException e) {
    e.printStackTrace();
}

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.core.JsonProcessingException;

// JSON Deserialization - Convert JSON string to Java object
String jsonData = "{\"id\":1,\"name\":\"John Doe\",\"email\":\"[email protected]\",\"isActive\":true,\"tags\":[\"developer\",\"Java\"]}";

ObjectMapper mapper = new ObjectMapper();
try {
    User user = mapper.readValue(jsonData, User.class);
    System.out.println(user.getName()); // Output: John Doe
    System.out.println(Arrays.toString(user.getTags())); // Output: [developer, Java]
} catch (JsonProcessingException e) {
    System.err.println("JSON parsing error: " + e.getMessage());
}

using System;
using System.Text.Json;
using System.Collections.Generic;

// User class definition
public class User
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Email { get; set; }
    public bool IsActive { get; set; }
    public List<string> Tags { get; set; }
}

// JSON Serialization - Convert C# object to JSON string
var user = new User
{
    Id = 1,
    Name = "John Doe",
    Email = "[email protected]",
    IsActive = true,
    Tags = new List<string> { "developer", "C#" }
};

string jsonString = JsonSerializer.Serialize(user, new JsonSerializerOptions
{
    WriteIndented = true
});
Console.WriteLine(jsonString);

using System;
using System.Text.Json;

// JSON Deserialization - Convert JSON string to C# object
string jsonData = "{\"Id\":1,\"Name\":\"John Doe\",\"Email\":\"[email protected]\",\"IsActive\":true,\"Tags\":[\"developer\",\"C#\"]}";

try
{
    User user = JsonSerializer.Deserialize<User>(jsonData);
    Console.WriteLine(user.Name); // Output: John Doe
    Console.WriteLine(string.Join(", ", user.Tags)); // Output: developer, C#
}
catch (JsonException ex)
{
    Console.WriteLine($"JSON parsing error: {ex.Message}");
}

package main

import (
    "encoding/json"
    "fmt"
    "log"
)

// User struct definition
type User struct {
    ID       int      `json:"id"`
    Name     string   `json:"name"`
    Email    string   `json:"email"`
    IsActive bool     `json:"is_active"`
    Tags     []string `json:"tags"`
}

func main() {
    // JSON Serialization - Convert Go struct to JSON string
    user := User{
        ID:       1,
        Name:     "John Doe",
        Email:    "[email protected]",
        IsActive: true,
        Tags:     []string{"developer", "Go"},
    }

    jsonBytes, err := json.MarshalIndent(user, "", "  ")
    if err != nil {
        log.Fatal(err)
    }
    
    fmt.Println(string(jsonBytes))
}

package main

import (
    "encoding/json"
    "fmt"
    "log"
)

func main() {
    // JSON Deserialization - Convert JSON string to Go struct
    jsonData := `{"id":1,"name":"John Doe","email":"[email protected]","is_active":true,"tags":["developer","Go"]}`

    var user User
    err := json.Unmarshal([]byte(jsonData), &user)
    if err != nil {
        log.Printf("JSON parsing error: %v", err)
        return
    }

    fmt.Println(user.Name) // Output: John Doe
    fmt.Println(user.Tags) // Output: [developer Go]
}

<?php
// JSON Serialization - Convert PHP array to JSON string
$user = [
    'id' => 1,
    'name' => 'John Doe',
    'email' => '[email protected]',
    'is_active' => true,
    'tags' => ['developer', 'PHP']
];

// Convert to JSON string
$jsonString = json_encode($user, JSON_PRETTY_PRINT);
if ($jsonString === false) {
    echo 'JSON encoding error: ' . json_last_error_msg();
} else {
    echo $jsonString;
}
?>

<?php
// JSON Deserialization - Convert JSON string to PHP array
$jsonData = '{"id":1,"name":"John Doe","email":"[email protected]","is_active":true,"tags":["developer","PHP"]}';

// Parse JSON string
$user = json_decode($jsonData, true);
if (json_last_error() !== JSON_ERROR_NONE) {
    echo 'JSON parsing error: ' . json_last_error_msg();
} else {
    echo $user['name']; // Output: John Doe
    print_r($user['tags']); // Output: Array ( [0] => developer [1] => PHP )
}
?>