Format, validate, and transform JSON into TypeScript
Input
Preview
Waiting for valid JSON...
Frequently Asked Questions
What does JSON Previewer do?
JSON Previewer lets you instantly format, validate, and visualize your JSON data. Explore nested objects easily, and even generate TypeScript interfaces with one click.
How accurate is the JSON → TypeScript converter?
Very accurate. It intelligently infers data types, handles nested objects and arrays, and creates clean, production-ready TypeScript interfaces with proper naming conventions.
Is my JSON data stored or sent anywhere?
Nope. Everything runs entirely in your browser. We don't store, upload, or track any of your JSON data.
Does it support large JSON files?
Yes, within browser limits. It can comfortably handle files up to a few megabytes.