JSON to TypeScript

About this json to typescript

Converting JSON to TypeScript types manually is tedious and error-prone, especially with deeply nested objects or large datasets. Our JSON to TypeScript converter automates this process, instantly generating strongly-typed TypeScript interfaces, classes, or Zod schemas from any JSON structure. Whether you're working with API responses, configuration files, or database exports, this tool ensures type safety and eliminates the need for manual type definitions.

Stop wasting time writing boilerplate type definitions. This TypeScript generator analyzes your JSON structure and produces production-ready code in seconds. Unlike basic converters, our tool supports multiple output formats—interfaces for quick development, classes for OOP patterns, and Zod schemas for runtime validation. With strict mode, it enforces more rigorous type checking, while batch convert lets you process multiple JSON files at once.

Real-world use cases include: transforming API response JSON into TypeScript interfaces for frontend applications, generating data models from database query results, creating configuration type definitions for build tools, and building type-safe validation schemas with Zod. Perfect for developers working with REST APIs, GraphQL, microservices, or any JSON-based data source.

Privacy is built in—all conversion happens locally in your browser. Your JSON data never leaves your device, so you can safely convert sensitive data, API responses, or internal configurations without security concerns. Process large files, batch convert multiple JSON documents, and customize naming conventions to match your project's style guide.

Whether you need interfaces, classes, or Zod validators, this tool generates clean, production-ready TypeScript code that integrates seamlessly into your workflow.

How to use this tool

1. 01

   Paste Your JSON

   Enter or paste any valid JSON data into the input field. You can use a single object, an array, or complex nested structures. The tool accepts JSON from API responses, configuration files, or any other source.

2. 02

   Choose Output Format & Options

   Select your desired output type: TypeScript interface, class, or Zod schema. Enable strict mode for stricter type checking, customize property naming conventions (camelCase, PascalCase, etc.), and set other preferences like interface prefixes.

3. 03

   Generate & Copy Your Types

   Click convert and instantly get production-ready TypeScript code. Copy the generated types directly to your project, or review and modify them as needed. Batch convert multiple JSON files to process entire datasets at once.

4. 04

   Use in Your Project

   Import the generated types into your TypeScript files for full type safety. With Zod schemas, you also get runtime validation for incoming data, ensuring type safety at both compile-time and runtime.

Worked examples

{
  "id": 123,
  "name": "John Doe",
  "email": "john@example.com",
  "active": true,
  "tags": ["admin", "user"]
}

interface User {
  id: number;
  name: string;
  email: string;
  active: boolean;
  tags: string[];
}

{
  "username": "alice",
  "age": 28,
  "verified": true
}

import { z } from "zod";

const UserSchema = z.object({
  username: z.string(),
  age: z.number(),
  verified: z.boolean(),
});

{
  "user": {"id": 1, "name": "Bob"},
  "created": "2024-01-15",
  "metadata": {"source": "api"}
}

class Response {
  user: {id: number; name: string};
  created: string;
  metadata: {source: string};
}

Limits and edge cases

• Strict mode applies stricter type inference—for example, treating numeric values as `number` rather than allowing null by default. This is useful for APIs with guaranteed data structure.
• The batch convert feature allows you to process multiple JSON objects simultaneously, perfect for converting entire API response collections or configuration file sets into corresponding type definitions.
• Generated code follows TypeScript best practices: optional properties use `?`, union types are properly formatted, and naming conventions can be customized to match your project style guide.

Standards and references