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AI JSON Generator

JSON to TypeScript Interface

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Generate strictly-typed TypeScript interfaces and type aliases from sample JSON payloads in one click.

Sample JSON Payload
TypeScript Definitions
export interface ApiResponse { userId: number; username: string; email: string; isVerified: boolean; profile: Profile; roles: string[]; settings: Settings; } export interface Settings { theme: string; notifications: Notifications; } export interface Notifications { email: boolean; sms: boolean; } export interface Profile { fullName: string; bio: string; avatarUrl: string; }

✓ How to Use the JSON to TypeScript Interface

  1. 1

    Paste your sample JSON payload into the input editor.

  2. 2

    Configure your typing preferences (interface vs type, optional properties).

  3. 3

    View the generated TypeScript types with syntax highlighting.

  4. 4

    Copy the code directly into your TypeScript project.

JSON to TypeScript Interface: Overview & Capabilities

A JSON to TypeScript generator infers strict TypeScript interfaces, type definitions, and nested models directly from sample JSON data.

Generate strictly-typed TypeScript interfaces and type aliases from sample JSON payloads in one click. Engineered for developers, it runs 100% client-side in your browser for zero latency and complete privacy—no data is ever stored or transmitted across remote networks.

Explore deeper technical specifications in our comprehensive guide: JSON to Code and Models Developer Reference Guide →

Key Capabilities

  • Generates nested interfaces for child objects
  • Infers union types for heterogeneous arrays
  • Configurable naming conventions (PascalCase, prefix "I")
  • Option to generate Type aliases or Interfaces

Frequently Asked Questions

How does it handle nested objects?

It generates dedicated, recursively linked child interfaces for each nested object.

Can it detect optional properties across array items?

Yes, when given an array of objects, properties missing in some items are marked as optional (?).

Does it handle union types for mixed-type arrays?

Yes, arrays containing both strings and numbers generate union types like (string | number)[].

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