Developer utility
Turn JSON into TypeScript interfaces in one click
Paste an API response and get clean, named interfaces with optional keys, unions, and deduplicated nested types. Nothing leaves your browser.
JSON to TypeScript Interface Converter
Everything runs on your device. Your JSON is never uploaded anywhere.
TypeScript Interfaces
Your generated interfaces will appear here.
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⚙️ How it works
- Paste & Convert: Drop your raw JSON API response into the left editor and hit Convert.
- Smart Extraction: The engine recursively traverses your payload, creating dedicated, named interfaces for nested structures.
- Intelligent Merging: Arrays containing varied object schemas merge automatically. Missing properties convert into clean optional fields (
key?: type). - Advanced Record Detection: Homogeneous key-value maps and dynamic tracking IDs collapse instantly into scalable
Record<string, type>blocks. - Zero Bloat: Identical child data models reuse a single shared type definition to keep your code output lean.
🔒 Data Privacy
- 100% Client-Side: All parsing code executes locally inside your web browser.
- Zero Leakage: Your payloads never leave your machine and are never transmitted to external servers or APIs.
- Enterprise Safe: Completely secure for processing private keys, internal production payloads, or confidential schema configurations.