JSON to Code: Generate TypeScript, Python, Java, Go & C# Types Automatically

Why Generate Code from JSON?

Every developer has done it: stared at a JSON API response and manually written types, interfaces, or classes to represent that data. It's tedious, error-prone, and wastes valuable development time.

With ConvertTOON's code generation tools, you paste your JSON and instantly get production-ready code in TypeScript, Python, Java, Go, or C#.

Supported Languages

TypeScript Interfaces

Generate TypeScript interfaces with proper type inference. Supports nested objects, arrays, optional fields, and union types.

// Input JSON:
{"user": {"name": "John", "age": 30, "tags": ["admin", "user"]}}

// Generated TypeScript:
interface User {
  name: string;
  age: number;
  tags: string[];
}

interface Root {
  user: User;
}

Try JSON → TypeScript →

Python Dataclasses

Generate Python 3.7+ dataclasses with type annotations. Includes proper imports and supports nested structures.

from dataclasses import dataclass
from typing import List, Optional, Any

@dataclass
class User:
    name: str
    age: int
    tags: List[str]

@dataclass
class Root:
    user: User

Try JSON → Python →

Java POJO Classes

Generate Java classes with private fields, constructors, getters, and setters. Ready for use with Jackson or Gson.

public class User {
    private String name;
    private int age;
    private List<String> tags;

    public User() {}

    public String getName() { return this.name; }
    public void setName(String name) { this.name = name; }
    // ...
}

Try JSON → Java →

Go Structs

Generate Go structs with JSON tags for seamless serialization and deserialization.

type User struct {
    Name string   `json:"name"`
    Age  int      `json:"age"`
    Tags []string `json:"tags"`
}

Try JSON → Go →

C# Classes

Generate C# classes with JsonPropertyName attributes for System.Text.Json serialization.

using System.Text.Json.Serialization;

public class User
{
    [JsonPropertyName("name")]
    public string Name { get; set; }

    [JsonPropertyName("age")]
    public int Age { get; set; }

    [JsonPropertyName("tags")]
    public List<string> Tags { get; set; }
}

Try JSON → C# →

Best Practices

• Use representative sample data: Include all possible fields and data types in your sample JSON
• Handle null values: If a field can be null, include a null example so the generator marks it as optional
• Use meaningful field names: The generated code uses your JSON keys as identifiers
• Review and customize: Generated code is a starting point — add validation, documentation, and business logic

Try It Now

Visit ConvertTOON and select your target language from the Conversion category. Paste your JSON and get instant, production-ready code.