JSON to Language Struct / Class Generator
About JSON → GraphQL Type
The JSON to GraphQL Schema & Type Definition Generator converts JSON payloads into GraphQL Schema Definition Language (SDL) types (`type User { ... }`), input types (`input UserInput { ... }`), queries, and scalar mappings.
How to Use JSON → GraphQL Type
Step 1
Paste your JSON payload into the input editor.
Step 2
Select GraphQL type style (Type or Input) and non-null defaults.
Step 3
Specify root type name (e.g. `Account`).
Step 4
Click "Copy GraphQL SDL".
Practical Use Cases for JSON → GraphQL Type
Prototyping GraphQL API Schemas from REST Payloads
Convert existing legacy REST API JSON responses into GraphQL SDL types for Apollo Server, Yoga, and Hasura GraphQL endpoints.
Generating GraphQL Mutation Input Types
Auto-generate matching `input CreateUserInput { ... }` mutation types from client-side JSON request bodies.
Input & Output Examples
Converting JSON to GraphQL Type Definition
`{ "id": "u123", "name": "Emma", "score": 98.5, "tags": ["admin"] }``type User {\n id: ID!\n name: String!\n score: Float!\n tags: [String!]!\n}`Key Features & Performance
- ✓Generates GraphQL Object Types (`type`), Input Types (`input`), and Interface declarations.
- ✓Maps primitives to GraphQL scalars: `ID`, `String`, `Int`, `Float`, `Boolean`, and custom `DateTime`.
- ✓Configurable field non-nullability (`!` modifiers) and list wrapping (`[Type!]!`).
- ✓100% Client-Side memory execution.
- ✓1-Click Copy GraphQL schema.
Key Terminology & Definitions
GraphQL SDL (Schema Definition Language)
The standard human-readable syntax used to define GraphQL schema types, relationships, queries, and mutations.
Non-Null Modifier (`!`)
An exclamation point appended to a GraphQL type indicating that the field is guaranteed to never return a null value.