Free online JSON to GraphQL type generator. Paste JSON and generate GraphQL type definitions with nullability markers automatically. 100% browser-based with zero uploads.
100% browser-based — your data never leaves your device
Convert JSON to GraphQL schema types instantly. Generate GraphQL type definitions from JSON samples for your API schema.
Copy your JSON data and paste it into the input textarea above.
Toggle nullable detection and type naming preferences for your GraphQL schema.
Click Generate, then copy the GraphQL type definitions or download the .graphql file.
Drop a file here or click to browse
Ctrl+Enter to generate
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JSON to GraphQL is a free online json tool that convert json to graphql schema types instantly. generate graphql type definitions from json samples for your api schema. It works entirely in your browser — no downloads, no installations, and no server uploads required. backend developers, frontend engineers, DevOps engineers use JSON to GraphQL when they need a fast, privacy-respecting way to process json data without installing additional software. It supports capabilities such as type definitions, nullable detection, nested type extraction. Additional features include local processing. Common use cases include generating graphql type definitions from sample api response json, creating initial schema types for graphql server development and prototyping, documenting rest api responses as graphql types for migration planning. All processing happens locally using modern browser APIs, which means your data never leaves your device. This makes JSON to GraphQL ideal for working with sensitive data, proprietary code, or any situation where privacy matters.
JSON to GraphQL Type Generator is a free online json tool that helps you convert json to graphql schema types instantly. generate graphql type definitions from json samples for your api schema. Key capabilities include type definitions, nullable detection, nested type extraction. All processing is done locally in your browser — no data is uploaded, stored, or shared with any server. There are no sign-ups, no file size limits, and no hidden charges. It is commonly used to generating graphql type definitions from sample api response json.
Copy your JSON data and paste it into the input textarea above.
Toggle nullable detection and type naming preferences for your GraphQL schema.
Click Generate, then copy the GraphQL type definitions or download the .graphql file.
| Category | Details |
|---|---|
| Input Limits | Maximum file size: Browser memory bound (~2 GB) |
| Nesting depth: Unlimited (browser stack limit) | |
| Supported Formats | JSON, JSONC (with comments), JSON5 (extended syntax) |
| Browser Engine |
|
All operations run entirely in your browser using built-in JSON APIs. No server uploads, no data storage, and no third-party requests.
JSON to GraphQL is ideal when you need to generating graphql type definitions from sample api response json without installing software or uploading data to a server. Since everything runs in your browser, there is no setup time and no risk of your data being stored on external servers. For for persistent editing environments with linting, consider using VS Code with JSON extension. For for server-side JSON processing in scripts, jq (command-line) may be a better fit. JSON to GraphQL fills the gap between heavyweight desktop tools and insecure online services that require uploading your data.
The generator creates type definitions with proper field types, non-null (!) markers, list types ([]), and nested type references. Input types and enums are not generated.
If a field has a null value in your JSON, it is marked as nullable (without !). If all instances of a field have non-null values, it gets the non-null (!) marker. In array mode, null elements mark the array item as nullable.
No. All conversion happens locally in your browser.
Creates GraphQL type definitions with proper field types, non-null (!) markers, and list brackets.
Fields with null values are marked as nullable (without !), fields with consistent values are marked as non-null (with !).
Nested objects become separate GraphQL types with proper field references.
All conversion happens locally — your data never leaves your browser.
JSON to GraphQL Type Generator is useful in a variety of scenarios across different workflows:
Generating GraphQL type definitions from sample API response JSON
Creating initial schema types for GraphQL server development and prototyping
Documenting REST API responses as GraphQL types for migration planning
Include all fields that exist in your API in the sample JSON — fields missing from the sample will be absent from the generated types.
Nullable (!) markers are inferred from your sample data. Review the generated types and adjust based on your actual schema requirements.
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