How do I use the JSON to TypeScript Converter?

Paste a JSON object or array into the input area. Set the root interface name (default: Root). Optionally enable optional properties (?) or readonly modifiers. Click Convert to generate TypeScript interfaces. Copy the output and paste into your TypeScript project.

Is the JSON to TypeScript Converter free?

Yes, the JSON to TypeScript Converter is completely free. It runs entirely in your browser with no signup, no download, and no data sent to any server.

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converter

JSON to TypeScript Converter

Convert JSON objects to TypeScript interfaces automatically. Supports nested objects, arrays, optional, and readonly modifiers.

json to typescriptjson to tstypescript interface generatorjson to type

JSON to TypeScript Converter

Paste JSON

Root Interface Name

Options Make all properties optional (?) Add readonly modifier

TypeScript Interfaces

How to use

How to Use the JSON to TypeScript Converter

1 Paste a JSON object or array into the input area.
2 Set the root interface name (default: Root).
3 Optionally enable optional properties (?) or readonly modifiers.
4 Click Convert to generate TypeScript interfaces.
5 Copy the output and paste into your TypeScript project.

The JSON to TypeScript Converter automatically generates TypeScript interfaces from JSON data. It handles nested objects (creating separate interfaces), arrays (detecting item types), and primitive types (string, number, boolean, null). Arrays with mixed types generate union types.

TypeScript interfaces provide compile-time type checking, better IDE autocompletion, and self-documenting code. This tool is especially useful when working with REST APIs — paste a sample response to instantly generate the types. The optional (?) modifier makes all properties optional, useful for partial updates or PATCH endpoints.

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