JSON to GraphQL Converter- Generate GraphQL Types Online

Online JSON to GraphQL Converter: Rapidly Generate GQL Types

Modernize your API development with our JSON to GraphQL tool. Manually writing GraphQL Type Definitions(SDL) can be time-consuming, especially when dealing with deeply nested JSON objects from legacy REST APIs. This tool allows you to paste any JSON sample and instantly receive a clean, structured GraphQL, including types, nested objects, and arrays.

Why Convert JSON to GraphQL?

GraphQL is the modern standard for flexible and efficient APIs, but defining the schema is the first—and often most tedious—step.

Accelerate Your Development Workflow

Instead of manually mapping every field from a JSON response to a GraphQL type, let our tool do it for you. This is perfect for developers who are building a GraphQL wrapper around an existing REST API or initializing a new Apollo or Relay project.

Ensure Schema Accuracy

Human error during manual schema writing can lead to mismatched types and runtime errors. By generating your schema directly from real data samples, you ensure that your Int, String, Boolean, and Float types are correctly identified from the start.

Key Features of Our JSON to GraphQL Tool

Our converter is designed to handle the complexities of the GraphQL Schema Definition Language(SDL).

1. Intelligent Type Inference

Our engine analyzes your JSON values to determine the most appropriate GraphQL scalar types:

• "text" → String

• 123 → Int

• 12.34 → Float

• true → Boolean

• null → String(Default)

2. Recursive Nested Object Support

If your JSON data contains nested objects, the converter automatically creates additional type blocks. This ensures that your schema remains modular and follows the graph structure that GraphQL is known for.

3. Array to List Mapping

Our tool identifies arrays in your JSON and maps them to GraphQL List types(e.g., [User]). It also scans the elements of the array to ensure the inner type is consistent.

How to Convert JSON to GraphQL

1. Paste your JSON: Insert your raw JSON response or object into the input editor.

2. Naming:(Optional) Give your root type a name, such as User, Product, or QueryResponse.

3. Instant Conversion: The GraphQL Definition(SDL) appears immediately in the output window.

4. Implement: Copy the generated types and paste them into your schema file or your typeDefs constant.

Technical Insights: Mapping Logic

Handling Required Fields

Par défaut, les champs GraphQL peuvent être nuls. Cependant, si vous utilisez un schéma JSON en entrée ou si vous souhaitez une validation stricte, vous pouvez ajouter manuellement l' !opérateur `Non-Null` au code généré, là où cela est nécessaire.

Des objets aux entrées

Bien que cet outil génère principalement typedes définitions pour les requêtes, la même structure peut être facilement adaptée en inputtypes pour vos mutations GraphQL en changeant simplement le mot-clé de typeà input.

Foire aux questions(FAQ)

Cet outil prend-il en charge le schéma JSON ?

Oui. Vous pouvez coller un schéma JSON standard, et le convertisseur utilisera les définitions de propriétés pour construire vos types GraphQL.

Est-ce compatible avec Apollo Server ?

Absolument. Le résultat est au format GraphQL SDL standard, entièrement compatible avec Apollo, Yoga, Relay et tout autre moteur compatible GraphQL.

Mes données sont-elles en sécurité ?

Oui. Le traitement s'effectue intégralement dans votre navigateur. Nous ne stockons ni ne transmettons vos données JSON à aucun serveur externe, garantissant ainsi la confidentialité de vos structures d'API.