JSON to TypeScript Converter

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Instantly generate strongly-typed TypeScript interfaces and type aliases from JSON API responses and payloads.

100% Client-Side — Processed privately & locally in your browser.

Sample JSON Schemas

Root Name:

Declaration:

Export definitionsExtract nested interfacesReadonly propertiesMake all optional (?)Detect ISO dates (Date | string)

Raw JSON Input

TypeScript TypesTypes

4 interfaces• 31 lines

export interface ApiResponse {
  status: string;
  code: number;
  meta: Meta;
  data: Data[];
}

export interface Data {
  id: string;
  name: string;
  email: string;
  role: string;
  isActive: boolean;
  createdAt: string;
  tags: string[];
  metadata: Metadata;
}

export interface Metadata {
  loginCount: number;
  lastIp: string;
}

export interface Meta {
  currentPage: number;
  perPage: number;
  totalPages: number;
  totalCount: number;
  hasNextPage: boolean;
  hasPrevPage: boolean;
}

1Paste any JSON object or array of objects into the source panel.
2Choose between TypeScript 'interface' or 'type' definitions.
3Configure type options: root name, optional property detection, readonly modifiers, and export keywords.
4Copy the generated TypeScript definitions with nested object interfaces automatically separated.

Frequently Asked Questions

Is my data sent to any server?

No. All processing for this tool occurs directly within your web browser using Web APIs and WebAssembly. Your data never leaves your computer.

Can I use this tool offline?

Once loaded, most utilities remain functional even if your connection drops. DevtUtils is designed to be lightweight and resilient.

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