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JSON to TypeScript

Transform JSON objects into clean, accurate TypeScript interfaces and types. Automate your boilerplate. Fast, free, and 100% private browser tool.

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About JSON to TypeScript

FusioFiles 100% Client-Side Privacy Guarantee

Your files and data never leave your browser — processed directly on your device.

Zero Server UploadsExecution occurs entirely in browser memory via WebAssembly and HTML5 Canvas.
HIPAA & GDPR ReadySafe for confidential tax forms, medical records, financial sheets, and legal contracts.
Zero Cloud LatencyInstant results with no upload delays, server queues, or third-party tracking.
Automatic RAM PurgeBuffers and caches are automatically wiped clean the instant you close the tab.
1

Input JSON

Paste a representative JSON object from your API or config file.

2

Select Mode

Choose between Interface or Type Alias generation.

3

Apply Logic

The tool recursively parses the object and maps internal structures to types.

4

Copy Types

Grab the generated code and use it in your project's .ts or .tsx files.

Speed up your frontend development by instantly generating TypeScript definitions from your API responses. Our JSON to TypeScript engine intelligently infers types, handles optional fields, and maps and nested structures into clean interfaces that strictly adhere to TS best practices. All logic is executed on your device, keeping your proprietary data structures safe.

Key Features

Smart Type Inference

Automatically detects strings, numbers, booleans, and nested objects.

Interface Generation

Creates clean, modular interfaces ready to be pasted into your types directory.

Modular Architecture

Correctly handles complex, nested data by splitting them into logical sub-interfaces.

Frequently Asked Questions

Currently, the engine detects types based on the provided sample. If you need optional fields, we recommend manual adjustment after generation.

Yes. The tool recursively extracts nested objects and generates the necessary child interfaces automatically.

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