JSON to TypeScript Converter
Generate TypeScript interfaces from JSON with nested types and arrays. Free, fast, and runs 100% in your browser.
Manually writing TypeScript interfaces from API responses is tedious and error-prone. This converter analyzes your JSON structure and generates clean, properly typed interfaces with correct handling of nested objects, arrays, and optional fields. Paste any JSON — from REST APIs, GraphQL responses, or database exports — and get production-ready TypeScript types in seconds.
Feature Overview
| Feature | Details |
|---|---|
| Nested object support | ✓ |
| Array type inference | ✓ |
| Union types | ✓ |
| PascalCase naming | ✓ |
| Privacy | 100% client-side |
Frequently Asked Questions
Does it handle deeply nested objects?
Yes. The generator recursively processes nested objects and creates separate named interfaces for each level.
How does it handle arrays of mixed types?
If an array contains mixed types, the tool generates a union type (e.g., string | number).
Can I customize the root interface name?
The root interface is named 'Root' by default. You can rename it after copying the output into your project.