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Instant TypeScript interfaces, Zod schemas, Python dataclasses, Go structs, Rust structs, and YAML→JSON or CSV→JSON conversion. Handles nested objects, arrays, optional fields, and data cleanup entirely in your browser.

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JSON input
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TypeScript interfaces
export interface Address {
  street: string;
  city: string;
  zip: string;
}

export interface User {
  id: number;
  name: string;
  email: string;
  role: string;
  verified: boolean;
  avatar?: null;
  tags: string[];
  address: Address;
}

export interface Root {
  user: User;
  createdAt: string;
  version: number;
}
Free: up to 50 KB · 7 modes · fully private·Pro: 5 MB input · batch processing · saved history · REST APIUpgrade to Pro — €7 →
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Runs entirely in your browser. Your JSON, YAML, and CSV never leave your machine. No API calls, no latency, no data retention.

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Toggle between TypeScript, Zod, Python dataclasses, Go structs, Rust structs, YAML→JSON, and CSV→JSON instantly. Nested objects, nullable fields, arrays, and tabular data transforms are all handled.

Pro
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Batch & API

Convert dozens of JSON files at once. Save conversion history. Access via REST API. Larger 5 MB input limit.

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€0/forever
  • ✓ Unlimited conversions
  • ✓ Up to 50 KB input
  • ✓ TypeScript, Zod, Python, Go, Rust, YAML→JSON, CSV→JSON
  • ✓ Client-side, fully private
  • ✓ Copy output instantly
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Pro
€7 one-time
  • ✓ Everything in Free
  • ✓ Batch processing
  • ✓ Up to 5 MB input
  • ✓ Saved conversion history
  • ✓ REST API access
  • ✓ Priority support
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