JSON to TypeScript

Instantly create strict TypeScript interfaces and types from a JSON payload.

About JSON to TypeScript

Stop writing types by hand! The Free JSON to TypeScript generator does it for you. Known as the Best JSON to TypeScript utility, it automatically infers types to output a perfect json to ts interface code block.

Features

Automatically generates nested TypeScript interfaces
Detects arrays, strings, numbers, and boolean types
Handles nullable and optional fields
Properly capitalizes Interface names
Instant offline conversion

How to Use

Paste a sample JSON payload from your API.
Click "Convert to TypeScript".
Review the generated Interfaces.
Copy the code directly into your TS project.

Frequently Asked Questions

Why do I need to convert JSON to TypeScript?

TypeScript requires defined types to provide autocomplete and catch errors at compile-time. Generating interfaces from real API data saves hours of manual typing.

How does it handle nested objects?

It recursively generates new, separate interfaces for nested objects and references them in the root interface.

What if a key has null as a value?

If a value is null and the tool cannot infer the type, it usually defaults to "any" or "unknown", which you can manually refine later.

Does it support array of objects?

Yes! It will define the object type and type the property as an Array of that interface (e.g., `items: Item[]`).

Does it create nested interfaces?

Yes, it automatically generates separate TypeScript interfaces for nested objects.

How does it name the root interface?

By default, it names it 'RootObject', but you can easily rename it in your code.

Can it infer optional types?

If an array contains objects with varying keys, it attempts to mark missing keys as optional.

Is this a free json to typescript tool?

Yes, this free json to typescript interface generator is fully accessible.

Does the best json to typescript tool detect nested objects?

Yes, it creates nested interfaces automatically when converting your json to ts interface.

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