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Schema Generator

Infer TypeScript, Zod, JSON Schema, and OpenAPI schemas from a JSON sample — client-side.

Formatters & Utilities
Privacy: 100% Client-Side. Your data never leaves this browser tab. Processing uses Web APIs and client-side libraries only.

Paste a JSON sample and generate TypeScript, Zod, JSON Schema (draft-07), or OpenAPI 3.0 component schemas — entirely in your browser.

export interface Root {
  id: string;
  email: string;
  roles: Array<string>;
  profile: {
    displayName: string;
    age: number;
    active: boolean;
  };
  meta: null;
}

Why generate schemas from samples?

When you have a response body but no formal contract, inferred types speed up clients, validators, and docs.

Paste JSON and switch between TypeScript, Zod, JSON Schema, and OpenAPI — generated locally with no network calls.

How to use this tool

  1. Paste a representative JSON sample and set a root type name.
  2. Switch tabs for TypeScript, Zod, JSON Schema, or OpenAPI output.
  3. Copy the generated schema into your project.

Frequently asked questions

How accurate are inferred types?

Inference follows the sample. Optional fields appear when array objects omit keys; widen samples for better unions.

Does this use an online API?

No. Everything runs in the browser.