JSON to TypeScript Interface Generator
Convert raw JSON objects and API responses into clean, strongly-typed TypeScript interfaces and type definitions.
Our free JSON to TypeScript Generator enables frontend and backend developers to convert JSON payloads into clean TypeScript interfaces. Support nested types, custom root names, and type aliases instantly.
Common Use Cases
- ✓Define API Response Types
Convert JSON payloads from REST API endpoints into typed TypeScript interfaces for Next.js, React, or Node.js apps.
- ✓Generate Type Definitions (.d.ts)
Build type aliases for configuration files, state management stores, and third-party data structures.
- ✓Refactor Legacy JavaScript Apps
Migrate plain JavaScript projects to TypeScript by generating interfaces from runtime JSON data.
Key Features
Nested Sub-Interface Extraction
Automatically extracts nested JSON objects into separate, modular TypeScript interfaces.
Type vs Interface Toggle
Choose between standard `interface` syntax or `type` alias definitions based on project conventions.
Export Keyword Support
Includes optional `export` statement prefixes for clean module imports.
How to Use This Tool
- Paste JSON Payload: Insert raw JSON payload or sample API response into the left editor box.
- Configure Interface Options: Customize root interface name, export toggle, and interface vs type choice.
- Click Convert to TS: Click the convert button to trigger instant AST parser analysis.
- Copy TypeScript Definitions: Click Copy TS to copy generated TypeScript interfaces directly into your editor.
Accelerating Full-Stack TypeScript Development
TypeScript interfaces specify strict contracts for object shapes, providing compile-time type safety, IDE autocompletion, and refactoring confidence.
Using an automated JSON to TypeScript converter saves time when modeling complex, multi-level API responses.
Advanced Features and SEO Benefits
Array & Tuple Type Inference
Infers element types for arrays (e.g. `string[]`, `number[]`) and nested object collections.
Zero Server Storage Security
Parsing executes 100% in local browser memory—confidential API payloads are never uploaded or stored.
Frequently Asked Questions
Can I convert nested JSON objects into separate interfaces?
Yes! Our generator automatically creates separate nested interface types for child objects.
Supports both 'interface' and 'type' keywords?
Yes, you can toggle between 'interface' and 'type' keywords depending on your project's coding style.
Is my JSON payload kept private?
Yes, all conversion takes place locally in your web browser. No data is ever transmitted over the network.
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