JSON to TypeScript
Paste JSON and generate typed interface declarations or type aliases from a single sample. Arrays merge object shapes with optional fields when elements differ. Nothing is uploaded.
Frequently asked questions
No. Your JSON sample is analyzed only in-browser. Nothing is sent to LocalTools servers for processing.
Yes; array shapes are merged, repeated keys become optional where needed, and you can set the root name and export style in the UI.
Related guides
- Generating TypeScript types from sample JSONHow tools infer interfaces from example payloads, what one sample cannot prove, and how to tighten types after generation—all in the browser on LocalTools.
- What is JSON?A plain-language introduction to JSON for developers and data wranglers, with a link to LocalTools’ browser-only formatter.