How does the tool handle nested objects and arrays?

Nested JSON objects are extracted into distinct, reusable TypeScript interfaces. Arrays are analyzed to infer union types or homogeneous element types.

Can it generate Zod schemas for runtime validation?

Yes. Toggle the Zod schema option to generate z.object() schemas with correct primitives, optional fields, and array definitions.

Are optional properties marked with a question mark?

Yes. When comparing array elements with missing keys or null values, keys are inferred as optional (key?: type).

Does my JSON payload stay private?

Yes. Type inference runs strictly in-browser using Web JavaScript APIs. Your data never touches an external server.

JSON to TypeScript: Convert raw JSON payloads

Tool Guide

JSON to TypeScript & Zod Converter: What It Does

Generates TypeScript interface and type declarations from raw JSON payloads. It infers types for nested objects, arrays, unions, and optional fields with clean PascalCase naming.

Example

Input

{"id": 1, "name": "Mango", "active": true}

Output

export interface RootObject {
  id: number;
  name: string;
  active: boolean;
}

Inspects JSON value primitives to construct strongly typed TypeScript interfaces.

How to Use

Paste a JSON object or array into the input pane.
Configure naming preferences (interfaces vs type aliases, optional vs required).
Copy the generated TypeScript definition code.

Limitations

Empty arrays default to any[] since element types cannot be inferred.
Deeply nested anonymous objects generate synthetic interface names like SubItem1.

Frequently Asked Questions

How does the generator handle arrays with mixed data types?

It infers a union type (e.g. Array<string | number>) when array items contain different primitive values.

Can I generate type aliases instead of interface definitions?

Yes. Toggle the declaration style option to emit export type declarations instead of interfaces.

Embed or Cite JSON to TypeScript & Zod Converter

Embed this interactive utility directly into documentation or blog posts, or link via GitHub badge:

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