How do I convert JSON to TypeScript interfaces online?

Paste your JSON into the input box and click Convert. The tool instantly generates accurate, ready-to-use TypeScript interfaces that you can copy or download.

Is my JSON data safe when converting to TypeScript?

Yes. All conversions happen entirely in your browser. No data is uploaded or stored on any server, ensuring complete privacy.

Can this tool handle nested JSON objects?

Yes. The converter generates nested TypeScript interfaces that precisely match your JSON structure, including arrays and objects.

Do I need to install anything to use the JSON to TypeScript tool?

No installation or signup is required. The tool runs completely in your browser, so you can use it instantly without any setup.

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JSON → TypeScript Interface

Paste or fetch JSON data and get clean TypeScript interfaces instantly.

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🔽 JSON Input

JSON

🧾 TypeScript Interface

TYPESCRIPT

Instant Conversion

Convert your data in real-time as you type. No delays, no waiting.

100% Private

All processing happens in your browser. Your data never leaves your device.

Always Free

No hidden fees, no premium plans. All features are completely free forever.

What is JSON to TypeScript Interface Converter?

Our free online JSON to TypeScript interface converter helps developers automatically generate TypeScript type definitions from JSON data. Whether you're working with APIs, configuration files, or data structures, this tool saves you hours of manual typing and reduces errors.

Instant Generation

Paste your JSON and get TypeScript interfaces instantly. No manual typing required.

Type Safety

Generate accurate TypeScript types that catch errors at compile time.

Smart Detection

Automatically detects nested objects, arrays, and optional properties.

Why Use JSON to Interface Converter?

Save Development Time

Manually writing TypeScript interfaces from API responses is tedious and error-prone. Our tool generates them automatically in seconds, letting you focus on building features instead of writing boilerplate code.

Reduce Errors

Typos in interface definitions can cause runtime errors that are hard to debug. Automated generation ensures your types match your data structure perfectly, catching bugs before they reach production.

Handle Complex Structures

Working with deeply nested objects or large API responses? Our tool handles complex JSON structures with ease, generating properly nested interfaces and detecting array types automatically.

Perfect for API Integration

When integrating third-party APIs, you often get JSON responses without type definitions. Paste the response into our tool and get ready-to-use TypeScript interfaces for your Angular, React, or Vue projects.

How to Use the JSON to Interface Converter

Paste Your JSON

Copy your JSON data from an API response, file, or any other source and paste it into the left editor panel.

{"name": "John" , "email": "sourav.ion@gmail.com" }

The tool automatically generates a TypeScript interface in the right panel. It detects types, handles nested objects, and creates proper interface names.

export interface User {
  name: string;
  email: string;
}

Copy & Use

Click the 'Copy' button to copy the generated interface to your clipboard, then paste it directly into your TypeScript project. No manual editing needed—it's ready to use!

Pro Tips

•Use the "Fetch JSON" feature to directly load data from an API endpoint
•Upload JSON files from your computer using the file upload option
•The tool preserves nested structures and automatically handles arrays
•Works with any valid JSON, including deeply nested objects and complex types

Frequently Asked Questions

Does it work with nested JSON objects?

Yes! The converter automatically handles nested objects of any depth and creates separate interfaces for each nested structure. It also properly detects arrays and optional properties.

Can I customize the interface names?

The tool generates sensible interface names automatically based on your JSON structure. After copying the generated code, you can easily rename interfaces in your IDE to match your project's naming conventions.

What frameworks is this compatible with?

The generated TypeScript interfaces work with any TypeScript-based framework including Angular, React, Vue, Next.js, NestJS, and more. It's pure TypeScript syntax with no framework-specific code.

Can I fetch JSON from an API directly?

Yes! Use the 'Fetch JSON' feature at the top of the page. Simply enter any public API endpoint URL, and the tool will fetch the JSON and automatically generate TypeScript interfaces from the response.

Is this tool really free?

Yes! JSONToAll is completely free to use with no hidden fees, registration requirements, or usage limits. All processing happens in your browser, so we don't even store your data.

Is my data safe and private?

Absolutely! All conversion happens entirely in your browser using JavaScript. Your data never leaves your device or gets sent to our servers. You can even use this tool offline once the page loads.

Do I need to install anything?

No installation required! This is a browser-based tool that works instantly. Just visit the page, use the tool, and you're done. No downloads, no setup, no configuration needed.

Can I use this for large files?

Yes! The tool can handle large and complex data structures. However, extremely large files (10MB+) might slow down your browser since all processing happens client-side. For best performance, use files under 5MB.

Ready to Generate TypeScript Interfaces Instantly?

Stop writing TypeScript interfaces manually. Convert JSON to type-safe TypeScript interfaces in seconds and boost your development productivity. Free, fast, and 100% browser-based.