JSON to GraphQL Schema - Convert JSON to GraphQL

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What Is a JSON to GraphQL Schema Converter?

A JSON to GraphQL schema converter transforms JSON data structures into GraphQL type definitions. Instead of manually writing SDL (Schema Definition Language), you paste your JSON and instantly get typed GraphQL types — including nested objects, arrays, and all scalar types like String, Int, Float, and Boolean.

How to Use

Paste your JSON object into the left textarea.
Optionally set a custom root type name (default: Root).
GraphQL schema types are generated automatically as you type.
Click Copy to copy the output to your clipboard.

Features

Generates named types for nested objects automatically.
Handles arrays with typed elements using the [Type] syntax.
Maps JSON primitives to correct GraphQL scalars: String, Int, Float, Boolean.
Adds non-null (!) markers for non-null fields automatically.
Customizable root type name for cleaner output.
Runs entirely in your browser — no data is sent to any server.

FAQ

What GraphQL scalars are supported?

The converter maps JSON strings to String, integers to Int, floating-point numbers to Float, and booleans to Boolean. Null values default to String without a non-null marker.

Does it handle deeply nested JSON?

Yes. Each nested object gets its own named type. The name is derived by combining the parent type name with the field name, e.g. an "address" field inside "Root" becomes "RootAddress".

Is my JSON data safe?

Completely. All conversion happens locally in your browser using JavaScript. No data is uploaded or stored anywhere.

Can I use the output directly in my GraphQL server?

Yes. The output is valid GraphQL SDL that you can use with Apollo Server, GraphQL Yoga, or any other GraphQL server that accepts SDL type definitions.