How does this convert JSON to TypeScript?

The tool parses your JSON, recursively analyzes each value's type, creates named interfaces for nested objects, determines array element types (including union types for mixed arrays), and generates clean TypeScript output with proper indentation.

What is the difference between interface and type in TypeScript?

Interfaces are extendable and mergeable — ideal for object shapes. Type aliases are more flexible and can represent unions, intersections, and primitives. For most JSON-to-TS conversions, interfaces are preferred, but the tool lets you choose either.

Does it handle nested objects and arrays?

Yes. Nested objects automatically get their own named interface (e.g., an "address" field generates an Address interface). Arrays are typed by their element type, and mixed-type arrays produce union types.

What happens with null values?

By default, null values are typed as null. You can toggle the "Use unknown for null" option to type them as unknown instead, which is stricter and forces type checking before use.

Is my JSON data safe?

Yes. Everything runs 100% in your browser. Your JSON is never sent to any server — the conversion happens entirely client-side using JavaScript.

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JSON to TypeScript

Convert JSON to TypeScript interfaces and types instantly online.

JSON Input

TypeScript Output

TypeScript types will appear here...

100% client-side. Your JSON never leaves your browser.

JSON to TypeScript कसरी प्रयोग गर्ने

1
Paste your JSON into the left input panel (or click "Try Example").
2
TypeScript interfaces appear instantly in the right panel.
3
Open Settings to customize: root name, interface vs type, optional/readonly, export, etc.
4
Click "Copy" to copy the generated TypeScript to your clipboard.
5
Use "Prettify" to format messy JSON before converting.

JSON to TypeScript बारेमा

Paste any JSON and instantly get clean, well-structured TypeScript interfaces with our free JSON to TypeScript converter. Stop writing type definitions by hand — generate production-ready types in seconds.

Key Features

Recursive Analysis: Handles nested objects, arrays, mixed-type arrays (union types), and null values.
Named Sub-Interfaces: Automatically creates separate named interfaces for nested objects (e.g., Address, Order).
Output Options: Choose interface vs type alias, optional properties, readonly modifiers, and exports.
Union Types: Mixed-type arrays generate proper TypeScript union types.

Who Is This For?

Frontend and backend developers working with REST APIs, GraphQL responses, or any JSON data source who need TypeScript type definitions quickly without writing them by hand.

Privacy & Security

Runs 100% in your browser — your JSON is never sent to any server. No signup required.

JSON to TypeScript बारेमा बारम्बार सोधिने प्रश्नहरू

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