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JSON to GraphQL Schema Converter

Convert JSON to GraphQL type definitions online. Generate accurate GraphQL schemas from JSON data with nested types and arrays. Free and instant.

About JSON to GraphQL Conversion

GraphQL uses a strongly-typed schema to define the shape of data available through an API. When designing a GraphQL API, you often start with sample JSON data from an existing REST endpoint or database. This tool analyzes your JSON structure and generates the corresponding GraphQL type definitions. It maps JavaScript types to GraphQL scalars (String, Int, Float, Boolean), creates separate type blocks for nested objects, and handles arrays as list types. The generated schema can serve as a starting point for your GraphQL server implementation. All processing happens locally in your browser.

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How to Use

  1. Paste your JSON data into the input panel
  2. Set the root type name (default: Root)
  3. Click Convert to generate GraphQL types
  4. Copy the schema into your GraphQL server

Common Use Cases

  • Designing GraphQL schemas from existing REST API responses
  • Prototyping GraphQL types from sample data
  • Migrating REST APIs to GraphQL
  • Generating type definitions for GraphQL code generators

Frequently Asked Questions

How does JSON to GraphQL conversion work?
The tool analyzes your JSON structure and maps each field to the appropriate GraphQL type. Strings become String, numbers become Int or Float, booleans become Boolean, nested objects become separate types, and arrays become list types.
Does it generate a complete GraphQL schema?
It generates type definitions that you can use in your schema. You may need to add custom resolvers, mutations, and input types depending on your API design.
How are nested objects handled?
Nested objects are extracted into separate named types. For example, a user with an address object will generate both a User type and an Address type.
Is the output ready to use in a GraphQL server?
The generated types are valid GraphQL SDL (Schema Definition Language) and can be used directly in servers like Apollo, Yoga, or any SDL-first GraphQL framework.