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JSON to GraphQL Schema

Convert JSON into GraphQL schema definitions. Object types, non-null markers, lists, and enums are inferred from your sample payload.

JSON input

Paste JSON, optionally name the root type, then generate.

Your GraphQL schema code will appear here.
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From REST sample to GraphQL types

Migrating a REST endpoint to GraphQL starts with modeling the response shape. This tool converts a real JSON payload into SDL type blocks, so your new schema reflects actual data instead of guesses.

Nullability done right

Getting nullability wrong is the most common GraphQL schema mistake. The generator marks fields non-null only when the sample proves them reliable, giving clients accurate contracts.

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JSON to GraphQL FAQs

What is GraphQL SDL?
The Schema Definition Language is how you declare types, queries, and mutations in GraphQL. A type block lists fields with their types, like name: String!.
What do the exclamation marks mean?
A ! marks a field as non-null: the server promises it is always present. Fields that were null or missing in the sample stay nullable, without the mark.
How are JSON arrays represented?
Arrays become list types like [String] or [Project], with the element type inferred from the items, matching how GraphQL models collections.
Which scalar types are used?
Strings map to String, whole numbers to Int, decimals to Float, booleans to Boolean, and nested objects become their own named types.
Can I paste this into Apollo Server?
Yes. The output is standard SDL, so it works as typeDefs in Apollo Server, Yoga, or any spec compliant GraphQL implementation.
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