Web Tools
JSON to GraphQL Schema
Convert JSON data to GraphQL type definitions. Infer nested types, list fields, non-null modifiers, and field descriptions. Runs entirely in your browser — your data never leaves your machine.
json graphql converter schema code-generator api
Published May 29, 2026
All interactive tools run entirely in your browser. Your data never leaves your device.
How It Works
Paste any JSON data and instantly get GraphQL type definitions. The tool infers types from values, handles nested objects, arrays, null values, and generates proper GraphQL SDL. Configure the root type name, non-null modifiers, and optional field descriptions.
Features
- Type generation:
type Root { name: String! }with proper GraphQL SDL syntax - camelCase fields: GraphQL-idiomatic field naming, with
snake_caseandkebab-casekeys converted automatically - Non-null modifiers: toggle
!suffix for non-null fields (default on) - Field descriptions: optional
"""description"""doc strings for each field - Nested type inference: objects within objects generate separate named types
- Accurate type mapping: String, Int, Float, Boolean, and nested types
- List handling: arrays generate
[Type]list fields - 5 example payloads: simple, nested, array, API response, blog post
- Private: runs entirely in the browser — no data transmitted
Use Cases
- Quickly bootstrapping GraphQL schemas from API response data
- Designing GraphQL types based on existing JSON structures
- Converting REST API responses to GraphQL type definitions
- Learning how JSON structures map to GraphQL SDL
- Generating type definitions for GraphQL code-first frameworks