JSON To TypeScript Interface
Infer a TypeScript interface from a representative JSON object.
Infer a TypeScript interface
Typing an API response by hand means transcribing every field and nested shape into a TypeScript interface. This tool infers that interface from a representative JSON object, so you get accurate types to paste into your code in seconds.
It reads the structure and value types of your sample and generates matching interface definitions, including nested objects. Paste a JSON object, copy the interface, and refine any types the sample could not fully capture.
Private and instant
Everything runs locally in your browser using standard web APIs — nothing is uploaded, logged, or stored on any server — so the tool works offline, responds instantly, and keeps whatever you paste in on your own device. That makes it safe to use even for confidential, client, or internal data you would never send to an unknown website.
Frequently Asked Questions
What does the json to typescript interface do?
It processes pasted developer text in your browser and writes a usable result to the output panel.
Does this send code or data to a server?
No. The tool runs client-side in your browser and does not upload your input.
What are the limits?
It is designed for everyday snippets, configuration values, and small files rather than huge production datasets.
Is this free?
Yes. It is a free browser utility with no account required.
Practical utilities for everyday web development work.