JSON to Code

    Generate types & interfaces from JSON.

    Input JSON
    Generated TypeScript
    export interface Preferences {
  theme: string;
  notifications: boolean;
}

export interface Profile {
  name: string;
  email: string;
  roles: string[];
  preferences: Preferences;
}

export interface Stats {
  logins: number;
  lastActive: string;
}

export interface Root {
  id: string;
  profile: Profile;
  stats: Stats;
}

    How to Convert JSON to Typed Code

    1. 1

      Paste your JSON

      Drop in an API response or any valid JSON object. A sample payload is loaded so you can see the output format immediately.

    2. 2

      Pick a target language

      Choose TypeScript, Go, Rust, Java, or Zod. The generated types update as soon as you switch.

    3. 3

      Copy into your project

      Use the Copy button to take the generated types straight into your codebase, then rename the root type to match your domain.

    Frequently Asked Questions

    No. Type generation runs entirely in your browser with JavaScript. The JSON you paste never leaves your device, which makes it safe to use with real API responses containing customer data.

    TypeScript interfaces, Go structs, Rust structs, Java classes, and Zod schemas. Paste any valid JSON object and switch languages with the selector — the output regenerates instantly.

    Nested objects become their own named types, referenced from the parent. Arrays are typed from their first element, so an array of objects produces a reusable item type rather than an inline structure.

    A null value cannot be typed precisely from a single sample, so it is emitted as a nullable or optional field depending on the target language. Review those fields against your API contract before shipping.

    Not with this tool — the conversion runs one way, from JSON to types. To inspect or reformat JSON itself, use the JSON Viewer.