How do I convert JSON to TypeScript interfaces?

Paste your JSON into the input field and click Convert. The tool instantly generates accurate TypeScript interfaces based on your JSON structure.

Does this tool support nested JSON objects?

Yes. Nested JSON objects and arrays are automatically converted into properly structured TypeScript interfaces.

Is this JSON to TypeScript Interface Generator free?

Yes. The tool is completely free and requires no signup or installation.

Is my JSON data secure?

Yes. All conversions run entirely in your browser. Your data is never uploaded or stored.

Tool Spotlight

JSON to TypeScript Interface Converter

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

Upload JSON

🔽 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.

Convert JSON to TypeScript Interface Online – Free JSON to TS Generator

Convert JSON to TypeScript interfaces instantly. Generate accurate, strongly typed TS interfaces from JSON data online for free.

What Is a JSON to TypeScript Interface Converter?

A JSON to TypeScript Interface Converter is an online tool that automatically generates strongly typed TypeScript interfaces from raw JSON data. Instead of manually writing interface definitions, developers can paste JSON from APIs, configuration files, or databases and instantly generate clean, accurate TypeScript types. This saves development time, improves type safety, and reduces runtime errors in modern frontend and backend applications.

Instant JSON to TS Generation

Convert JSON to TypeScript interfaces instantly. Paste your JSON data and generate structured TS interfaces in seconds with no manual typing.

Strong Type Safety

Generate accurate TypeScript types that catch mismatched data at compile time, improving code reliability and maintainability.

Smart Structure Detection

Automatically detects nested objects, arrays, optional fields, and complex JSON structures to generate properly nested TypeScript interfaces.

Why Use a JSON to TypeScript Interface Generator?

Save Development Time

Manually writing TypeScript interfaces from API responses is time-consuming and error-prone. Automatically generate interfaces from JSON in seconds and focus on building features instead of boilerplate.

Reduce Runtime Errors

Incorrect type definitions can cause subtle bugs. Generating TypeScript interfaces directly from JSON ensures your types accurately reflect real data structures.

Handle Complex & Nested JSON

Working with deeply nested objects or large API responses? This JSON to TS converter generates structured, nested interfaces automatically, including array detection.

Perfect for API Integration

When integrating REST or GraphQL APIs, quickly convert JSON responses into ready-to-use TypeScript interfaces for Angular, React, Next.js, or Vue projects.

When Should You Convert JSON to TypeScript Interface?

Working with REST or GraphQL APIs

When consuming APIs that return JSON data, convert responses into TypeScript interfaces to enforce strong typing and prevent integration errors.

Building Angular, React, or Next.js Applications

Use generated TypeScript interfaces to define models for services, components, and application state in modern frontend frameworks.

Planning Backend Integration

Generate interfaces early to clearly understand API data structures and avoid mismatches between frontend and backend teams.

Migrating JavaScript Projects to TypeScript

When refactoring JavaScript codebases, quickly generate interfaces from existing JSON structures instead of writing them manually.

Handling Large or Deeply Nested Data

Ideal for complex JSON objects where manual interface creation would be slow, repetitive, and error-prone.

Improving Code Quality & Maintainability

Strongly typed interfaces improve autocomplete, documentation clarity, long-term maintainability, and overall developer productivity.

How to Convert JSON to TypeScript Interface Online

Paste Your JSON Data

Copy JSON from an API response, configuration file, or database output and paste it into the input editor.

{"name": "John", "email": "john@example.com" }

The tool automatically analyzes your JSON structure and generates a fully typed TypeScript interface, including nested objects and arrays.

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 and Use in Your Project

Click the copy button and paste the generated interface directly into your TypeScript project. No manual edits required.

Pro Tips

•Use the "Fetch JSON" option to load live API responses directly into the editor
•Upload JSON files for faster large dataset conversion
•The converter preserves nested objects and correctly detects array types
•Works with any valid JSON including complex and deeply nested structures

Frequently Asked Questions

Everything you need to know about JSONtoAll tools.

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.

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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.