How to Convert JSON to Types

Generate TypeScript interfaces, Go structs, Rust types, and more from any JSON data. Free online JSON to types converter with instant output.

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Step-by-Step Guide

1

Paste your JSON

Copy a sample JSON response from your API, config file, or database and paste it into the input area. The tool accepts any valid JSON including deeply nested objects, arrays, and mixed types.

2

Select your target language

Choose your desired output language from the dropdown — TypeScript, Go, Rust, Python, Java, and more are supported. Each language generates idiomatic type definitions following that language's conventions and naming standards.

3

Generate type definitions

Click generate and the tool instantly analyzes your JSON structure, infers the correct types for each field, and produces clean, ready-to-use type definitions. Nested objects are extracted into separate named types for clarity.

4

Copy the result

Review the generated types and copy them directly into your project. The output is production-ready code that you can paste into your source files and start using immediately with full type safety.

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Frequently Asked Questions

What languages are supported?
The converter supports TypeScript interfaces, Go structs, Rust structs with serde attributes, Python TypedDict and dataclasses, Java classes, and more. Each output follows the idiomatic conventions of its target language.
Why should I generate types from JSON?
Generating types from JSON eliminates manual type-writing errors and saves significant development time. Typed code catches bugs at compile time rather than runtime, improves IDE autocompletion, and makes your codebase easier to refactor and maintain.
Does it handle nested and complex JSON?
Yes. The tool recursively analyzes nested objects, arrays of objects, mixed-type arrays, and nullable fields. Each nested object is extracted into its own named type definition, producing clean and readable output even for deeply nested structures.
Related Reference

TypeScript Cheat Sheet

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