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.
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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
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.
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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