Convert JSON objects and arrays into TypeScript interfaces and type definitions instantly. Paste your JSON and get clean, ready-to-use TypeScript types in one click.
Open JSON to TypeScript Converter → free, no sign-inYou've got a JSON response from an API and you need to type it in TypeScript. Writing the interfaces by hand is mechanical, tedious, and error-prone — especially for deeply nested objects. The JSON to TypeScript Converter does the entire job in one paste: copy in your JSON, get clean TypeScript interfaces out the other side.
Any frontend developer working in TypeScript runs into this repeatedly. Onboarding a new API, adding a new endpoint, updating existing types to match a schema change — this tool eliminates the most boring part of that work.
No tutorials. No learning curve. Open it and get started.
No server uploads.
Handles nested objects and arrays correctly, generating proper nested interfaces rather than flattening everything to any.
Completely free. No trial period. No premium tier for basic functionality. No account required. Use it as often as you need.
One job, done well. JSON to TypeScript Converter was built to solve a specific problem cleanly. No feature bloat, no ads, no distractions.
Does it handle nested JSON objects?
Yes — nested objects generate nested interfaces or inline types.
Does it support JSON arrays?
Yes — arrays are typed correctly as typed arrays in the output.
Is the output compatible with strict TypeScript?
Yes — the generated interfaces follow strict TypeScript syntax.
Can I convert very large JSON files?
Yes — paste any valid JSON and it will convert it.
Is this free?
Yes — free, no sign-in required.
Free. Instant. No sign-in. Open it and get the job done.
Open JSON to TypeScript Converter on Doathingy.com →