JSON to TypeScript

Generate TypeScript interfaces and types from JSON payloads for quick type scaffolding.

Root name

Keyword

Optional Readonly

JSON Input

Ctrl+Enter to convert

TypeScript Output

TypeScript output will appear here.

Step by step

How to use JSON to TypeScript

1
Paste a representative JSON object or array and choose the root type options.
2
Generate TypeScript definitions after the example data passes JSON validation.
3
Review inferred property and array types before copying the definitions into a project.

Capabilities

What this tool handles

Nested interface generation
Array type inference and union support
Optional and readonly modifiers

Common uses for JSON to TypeScript

Scaffold interfaces from an API response while prototyping a client.
Create initial types for fixtures and configuration objects.

What to check before using the result

Types are inferred from the supplied examples only; optional fields, nullable values, unions, and future API variants still require human review.

Privacy and accuracy

Questions about JSON to TypeScript

Does this tool upload my input?

The conversion or analysis runs in your browser. The application does not intentionally send the value you enter to a processing API. Standard hosting infrastructure can still receive request metadata when the page loads; see the privacy page for details.

Can I rely on the output without checking it?

Use the result as a focused development aid and verify it in the system where it will be used. Test representative edge cases and confirm the destination uses the same format, standard, and assumptions described on this page.

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