Schemato

JSON in, types out.

Paste a JSON payload, get TypeScript interfaces inferred instantly, including nullability, arrays, and nested shapes. Saves the five-minute typing tax on every new API integration.

Root type name

JSON input

TypeScript output

export interface User {
  id: string;
  email: string;
  isAdmin: boolean;
  createdAt: string;
  preferences: Preferences;
  projects: Project[];
}

export interface Preferences {
  theme: string;
  newsletter: null;
}

export interface Project {
  id: string;
  name: string;
  starred: boolean;
}

Smart inference

Mixed arrays become unions. Missing fields across array items become optional. Empty arrays become unknown[]. No silent any.

Nested types

Each nested object becomes its own named interface, so the output reads like something you'd write by hand. Copy, paste, ship.

Privacy by design

Everything runs in your browser. Paste a payload from a production API. It never crosses the wire.