JSON to TypeScript Type Generator

Convert JSON objects and API responses into clean, strongly typed TypeScript interfaces or type definitions.

⚡ 100% Client-side — Instant TypeScript Code Generation

Paste any JSON payload or REST API response to generate clean, strongly typed TypeScript interfaces or type declarations with nested types.

Root Name:

JSON Input

TypeScript Definitions

export interface Root {
  id: number;
  name: string;
  email: string;
  isActive: boolean;
  roles: string[];
  profile: Profile;
  settings: Settings;
}

export interface Settings {
  theme: string;
  notifications: Notifications;
}

export interface Notifications {
  email: boolean;
  sms: boolean;
}

export interface Profile {
  avatar: string;
  bio: string;
  followersCount: number;
}

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How to use the JSON to TypeScript Generator

Paste your JSON data. Customize options such as interface vs type alias, optional fields, readonly modifiers, and root interface name. Copy the generated TypeScript types with one click.

?Frequently Asked Questions

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What is the JSON to TypeScript Type Generator?

The JSON to TypeScript Generator parses raw JSON data and generates clean, strongly typed TypeScript interfaces or type aliases with recursive nested type decomposition, optional modifier controls, and export keyword toggling.

Who is the JSON to TypeScript Type Generator for?

Designed for frontend developers, Full-Stack TypeScript engineers, and API consumers creating type-safe data contracts from REST or GraphQL API responses.

How to Use the JSON to TypeScript Type Generator

Paste your JSON payload into the input editor.
Choose between interface vs type alias syntax, and toggle optional/readonly modifiers.
Set your custom root interface name.
Copy the generated TypeScript code directly into your codebase.

Worked Calculation Example

Converting '{"userId": 101, "username": "dev_alex", "roles": ["admin"]}' generates clean UserResponse interfaces with strongly typed string array properties.

Frequently Asked Questions

How does it handle nested JSON objects?

Nested JSON objects are extracted into separate, cleanly named PascalCase interfaces or type declarations for maximum modularity.

Can it handle heterogeneous arrays?

Yes! Arrays containing mixed primitive types generate union types (e.g. (string | number)[]).

Is my JSON data kept private?

Yes. All TypeScript generation runs locally in your browser memory. No code or payloads are sent to any server.

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