JSON to TypeScript Converter
Convert JSON to TypeScript interfaces and generate type definitions
JSON Input
TypeScript Output
What is JSON to TypeScript Converter?
Convert your JSON (JavaScript Object Notation) data into TypeScript interfaces automatically. This tool generates type-safe TypeScript interfaces from your JSON structure, making it easier to work with typed data in your TypeScript projects.
As TypeScript documentation explains, interfaces provide a powerful way to define the structure of objects. Our converter analyzes your JSON and creates corresponding TypeScript interfaces with proper typing for strings, numbers, booleans, arrays, and nested objects.
Everything happens in your browser – your data stays private. Generate, download, and use your TypeScript interfaces right away.
What Makes This Tool Different
Automatic Interface Generation
We analyze your JSON structure and automatically generate TypeScript interfaces with proper types. Each object becomes an interface, and arrays are properly typed.
Nested Object Support
Handles nested objects and arrays intelligently. Creates separate interfaces for nested structures and references them properly in parent interfaces.
Type Safety
Generates proper TypeScript types including string, number, boolean, arrays, and custom interfaces. Ensures type safety in your TypeScript projects.
File Upload Support
Got a large JSON file? Just upload it. Works great for converting complex JSON structures from APIs or databases without copy-pasting.
Download TypeScript
One click to download your TypeScript interfaces as a .ts file. Drop it into your project and start using type-safe code immediately.
Syntax Highlighting
Beautiful syntax highlighting for both JSON input and TypeScript output. Visual feedback helps you verify the conversion and spot issues early.
How It Works
Paste or Upload JSON
Paste your JSON object or array into the left editor, or click "Upload" to load a file. The converter works with any valid JSON structure. You can also click "Sample" to see an example.
Automatic Conversion
As soon as you paste, the converter analyzes your JSON structure and generates TypeScript interfaces on the right. Each object becomes an interface, and nested structures are handled automatically.
Download or Copy
Click "Download" to save the TypeScript interfaces as a .ts file, or "Copy" to copy them to your clipboard. The interfaces are ready to use in your TypeScript project.
When You'd Actually Use This
API Integration
Generate TypeScript interfaces from API response JSON. Ensures type safety when working with external APIs and helps catch errors at compile time.
Type-Safe Development
Create type definitions for JSON data structures in your TypeScript projects. Get autocomplete and type checking for your data models.
Code Generation
Quickly generate TypeScript interfaces from JSON schemas or sample data. Saves time when setting up new projects or integrating with APIs.
Documentation
Use generated interfaces as documentation for your data structures. TypeScript interfaces serve as both type definitions and documentation.
Common Questions
Is my JSON data stored?
Nope. Everything happens right in your browser. Your JSON never leaves your computer – we don't even see it.
What JSON formats work?
The converter works with any valid JSON structure – objects, arrays, nested objects, and mixed types. It analyzes the structure and generates appropriate TypeScript interfaces.
How are nested objects handled?
Nested objects become separate interfaces that are referenced in parent interfaces. Arrays of objects also get their own interface types.
Can I customize interface names?
The root interface uses a default name, but nested interfaces are automatically named based on their parent property names. You can rename them after generation.
What if my JSON has null values?
Null values are typed as any in the generated interfaces. You can manually adjust these to use union types like string | null if needed.
Does it work with large datasets?
Yep. Since everything happens in your browser, it depends on your device. Small to medium JSON structures convert instantly. Really huge structures might take a few seconds.
Other JSON Tools You Might Need
Conversion is just one JSON task. Here are other tools that work well together:
Need to learn more about JSON? Check out the official JSON.org website or the comprehensive guide on MDN.