JSON to GraphQL Type Generator helps you work with JSON data quickly and accurately, right in your browser. Whether you need to convert json to graphql schema types instantly. generate graphql type definitions from json samples for your api schema, this tool eliminatessyntax errors, malformed data, and inconsistent formatting by giving you instant, reliable results. Every operation runs locally on your device — nothing is uploaded to any server, so your data stays completely private.
How to Use JSON to GraphQL
Paste your JSON
Copy your JSON data and paste it into the input textarea above.
Configure options
Toggle nullable detection and type naming preferences for your GraphQL schema.
Copy the GraphQL code
Click Generate, then copy the GraphQL type definitions or download the .graphql file.
Key Features
Type Definitions
Creates GraphQL type definitions with proper field types, non-null (!) markers, and list brackets.
Nullable Detection
Fields with null values are marked as nullable (without !), fields with consistent values are marked as non-null (with !).
Nested Type Extraction
Nested objects become separate GraphQL types with proper field references.
Local Processing
All conversion happens locally — your data never leaves your browser.
Common Use Cases
- 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
JSON to GraphQL Type Generator
Convert JSON to GraphQL schema types instantly. Generate GraphQL type definitions from JSON samples for your API schema.
How to Use
Paste your JSON
Copy your JSON data and paste it into the input textarea above.
Configure options
Toggle nullable detection and type naming preferences for your GraphQL schema.
Copy the GraphQL code
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
Frequently Asked Questions
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What is JSON to GraphQL Type Generator?
JSON to GraphQL Type Generator is a free online tool that convert json to graphql schema types instantly. generate graphql type definitions from json samples for your api schema. Whether you are debugging an API response, transforming configuration files, or preparing data for frontend state management, this tool handles JSON data efficiently — all within your browser. Key capabilities include Type Definitions, Nullable Detection, Nested Type Extraction. Every operation is local, meaning your data never touches a server.
Unlike JSON utilities that require uploading your data to remote servers, JSON to GraphQL processes everything on your device. This approach gives you instant feedback, unlimited file sizes, and complete data privacy. It is particularly valuable when working with sensitive API payloads, proprietary configuration files, or large datasets you do not want to expose over the network.
Frequently Asked Questions
What GraphQL features are supported?
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.
How does nullable detection work?
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.
Is my data sent to a server?
No. All conversion happens locally in your browser.
How does the Type Definitions feature work?
The Type Definitions feature creates graphql type definitions with proper field types, non-null (!) markers, and list brackets. It is designed to be intuitive and responsive, giving you immediate feedback as you interact with the tool. All processing happens locally in your browser.
What is the benefit of nullable detection?
Nullable Detection fields with null values are marked as nullable (without !), fields with consistent values are marked as non-null (with !). This capability sets JSON to GraphQL apart from basic alternatives by providing more comprehensive functionality while maintaining the privacy and speed of local processing.
Is JSON to GraphQL really free to use?
Yes, JSON to GraphQL is completely free with no hidden charges, no sign-up requirements, and no usage limits. You can use it as often as you need, for any purpose — personal projects, commercial work, or educational use. There are no premium tiers or paid features.
Does JSON to GraphQL work on mobile devices?
Yes, it works on any device with a modern web browser — desktop, tablet, or phone. The interface is responsive and adapts to your screen size. Since all processing is done locally, you get the same performance regardless of your device.
What happens to my data when I use JSON to GraphQL?
Your data never leaves your device. Every operation is performed locally in your browser using JavaScript. No information is uploaded, stored, logged, or shared with any server. This privacy-first approach means you can work with sensitive data — passwords, API keys, personal information — without any risk of exposure.
Key Features
Type Definitions
Creates GraphQL type definitions with proper field types, non-null (!) markers, and list brackets.
Nullable Detection
Fields with null values are marked as nullable (without !), fields with consistent values are marked as non-null (with !).
Nested Type Extraction
Nested objects become separate GraphQL types with proper field references.
Local Processing
All conversion happens locally — your data never leaves your browser.
Common Use Cases
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
Tips & Best Practices
Use sample data with all fields
Include all fields that exist in your API in the sample JSON — fields missing from the sample will be absent from the generated types.
Review nullable annotations
Nullable (!) markers are inferred from your sample data. Review the generated types and adjust based on your actual schema requirements.
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Related Guides & Articles
Deepen your knowledge with these json guides and tutorials:
Common Errors & Fixes
Learn how to fix common errors related to JSON to GraphQL:
JSON Circular Reference Error
Fix 'Converting circular structure to JSON' error when using JSON.stringify with objects that reference themselves.
400 Bad Request Error
Learn what 400 Bad Request means, common causes like malformed syntax or invalid request parameters, and how to fix them.
422 Unprocessable Entity Error
Learn what 422 Unprocessable Entity means for API validation errors, how it differs from 400, and how to fix validation failures.