JSON to TypeScript Converter

A free tool to automatically infer and generate TypeScript type definitions (Interfaces/Types) by parsing JSON structures. Boosts development efficiency for API integrations. Works entirely in your browser, ensuring your JSON and type information is never sent to any server.

Input

Root Interface Name:

Output

Guide & Terminology

What is JSON to TypeScript?

This tool automatically infers and generates TypeScript interfaces based on the structure of any valid JSON array or object you provide.

How to Use

Paste your JSON array or object in the left editor.
The right editor will instantly update with the generated TypeScript interface or type declarations.
You can configure the Root Interface Name using the top input field.

Common Use Cases

Rapidly scaffolding frontend data models when connecting to a new REST API.
Ensuring type-safety for complex or deeply nested JSON configurations.

Security

All parsing and type inference happens securely in your browser. Your JSON data is never uploaded to any external server.

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