ProTools

JSON to TypeScript Interface Converter

Convert JSON payloads & REST API responses into strongly typed TypeScript interfaces instantly.

export interface UserResponse {
  id: number;
  name: string;
  isAdmin: boolean;
  tags: string[];
  profile: Profile;
}

export interface Profile {
  email: string;
  age: number;
}

About JSON to TypeScript Interface Generator

Convert JSON payloads, REST API responses, and database documents into clean, strongly typed TypeScript interfaces and type declarations with our free online converter. Automatically analyzes nested objects, array types, optional properties, and primitive types (string, number, boolean, null) to produce production-ready TypeScript code.

TypeScript Generation Features

  • 🌲 Deep Nested Object Parsing: Automatically creates separate named interfaces for child objects.
  • ⚡ Interface & Type Alias Modes: Generate standard interface or modern type definitions.
  • 🛡️ Strict Null & Array Typing: Accurately infers heterogeneous and uniform array member types.
  • 📋 One-Click Copy & Download: Instant export to integrate into your Next.js, React, Node.js, or Express codebase.

How to Convert JSON to TypeScript

  1. Paste your raw JSON payload or API response into the left editor.
  2. Set your Root Interface Name (default is RootObject).
  3. The strongly typed TypeScript code generates automatically on the right.
  4. Click 'Copy TypeScript' to paste directly into your .ts or .tsx project files.

Frequently Asked Questions (FAQ)

How does the tool handle nested JSON objects?

The converter recursively inspects nested objects and creates separate, cleanly named child interfaces linked to the parent object.

Can I generate Type aliases instead of Interfaces?

Yes! You can toggle between interface Name { ... } and type Name = { ... } with a single click.

Is my JSON data processed privately?

Yes, all JSON parsing and TypeScript interface generation happens 100% locally inside your web browser.

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