Instant feedback
300ms debounced conversion — results appear as you type, no button press needed.
About the
Converter
A free, privacy-first tool that turns JSON into GraphQL SDL instantly — built by developers, for developers.
Why we built this
If you've ever prototyped a GraphQL API, you know the friction: you have sample JSON data, but writing the corresponding SDL types by hand is tedious and error-prone. We built this converter to eliminate that friction.
Paste JSON, get types. No sign-up, no server, no tracking.
100%
Client-side
Your data never leaves your browser. No upload, no storage, no logging.
Built for developer workflows
Nested types
Recursively generates named types for deeply nested objects. Arrays become typed list fields.
100% private
Client-side only. Zero network requests for your data. No logs, no tracking, no cookies.
Monaco editor
Syntax-highlighted editing with the same engine that powers VS Code.
Copy & go
One-click copy of the generated SDL. Paste directly into your project.
Free forever
No paywalls, no usage limits, no sign-up required. It's a simple tool that does one thing well.
Try it now — no strings attached
Paste some JSON and see your GraphQL schema appear instantly.
Go to the Converter