JSON input
valid
TypeScript output
json2ts.com has been the canonical browser-based JSON-to-TypeScript converter for years. This tool addresses the same wedge plus Zod and Valibot output, and ships pre-loaded examples for common JSON shapes. Compare side-by-side below.
json2ts.com is the closest thing to a direct competitor in this niche. It's a single-page browser tool that converts pasted JSON into TypeScript interfaces. It's been around for years, has solid name recognition, and the output for typical JSON inputs is correct and idiomatic. If interface output is all you need and you're already in the habit of going there, you'll find no reason to switch on a per-paste basis.
The differentiator is what's on top of the same wedge. This tool toggles between TypeScript interface, TypeScript type alias, Zod schema, and Valibot schema — a Zod or Valibot consumer doesn't have to leave the page to wrap the type as a runtime parser. It also ships ~45 pre-loaded landing pages for shape-specific search intent (Stripe webhook to TypeScript, GitHub API to Zod, OpenAI Chat Completion to Valibot, etc.) — a one-click on the Stripe webhook example gives you a real Stripe event JSON loaded into the input pane, not a hand-typed sample.
Honest tradeoffs: json2ts.com is older and probably has more inbound links and search authority — for a generic 'json to typescript' query you may land there first. This tool is purpose-built for the multi-validator workflow and ships shape-specific examples. Output for the underlying TypeScript interface is functionally equivalent on most inputs; differences appear on optional-field inference for arrays of varying shapes and on nested type naming. Try the same payload in both — pick the one that fits your daily loop.