JSON to Code - Generate TypeScript, Go, Python, JSON Schema & More

What is JSON to Code?

JSON to Code is a tool that automatically generates type definition code for various programming languages from JSON data. It supports 8 output formats: TypeScript (interface), Zod (schema + type), Go (struct), Python (dataclass), Java (class), C# (class), Kotlin (data class), and JSON Schema (Draft 2020-12). It eliminates the manual effort of writing type definitions from API response JSON. All conversion processing happens entirely in your browser, so JSON containing sensitive data can be used safely.

See also: JSON Formatter · JSON Diff · JSON ⇔ CSV

How to Use

1. Paste JSON in the left panel
2. Select target language from the dropdown
3. Click the Convert button

Usage Examples

Input:
{"user": {"id": 1, "name": "John Smith", "active": true}}

TypeScript output:
export interface User {
  id: number;
  name: string;
  active: boolean;
}
export interface Root {
  user: User;
}

Practical use: Copy an API response JSON, generate type definitions instantly, and paste them into your frontend code

FAQ

Which languages are supported?

TypeScript (interface), Zod (schema + type), Go (struct), Python (dataclass), Java (class), C# (class), Kotlin (data class), and JSON Schema (Draft 2020-12).

Are nested objects correctly converted?

Yes. Nested objects are generated as separate interfaces or classes. Deep nesting is processed recursively.

How are array types inferred?

Based on the type of the first array element. Empty arrays are treated as unknown[]/[]interface{}/etc. depending on the language.

How is null handled?

Varies by language: null in TypeScript, interface{} in Go, Any? in Kotlin.

Is my data sent to a server?

No. All conversion processing happens entirely in your browser. JSON containing sensitive data can be used safely.

Related Tools