JSON to GraphQL Input Converter Online
Convert JSON objects into GraphQL input type syntax instantly. Our free JSON to GraphQL tool helps developers bridge REST JSON data with GraphQL schemas quickly.
About JSON to GraphQL Conversion
You have a JSON response and need to query it with GraphQL. Writing the type definitions by hand means checking every field, guessing at nullability, and handling nested objects. This tool reads your JSON structure and outputs GraphQL query syntax you can use immediately.
How it works
Paste your JSON and the tool walks through each field. Objects become nested selections. Arrays tell the tool what type of items to expect. The operation name and type (query or mutation) are yours to set.
What you get back is ready to drop into your GraphQL client. No manual typing, no second-guessing the structure.
When you'd use this
Maybe you're migrating from REST and have sample responses ready. Or you're writing tests and need valid query structures. The tool handles nested objects and arrays without getting confused.
It won't generate your full schema or handle interfaces and unions. For basic query generation from existing JSON, it gets you there faster than typing by hand.
Questions
Does this handle nested objects?
Yes. The tool recursively processes nested objects and creates selection sets for each level.
What about arrays?
Arrays are handled by examining the first item. The generated query includes fields from that item's structure.
Can I use this for mutations?
Yes, switch the operation type to mutation. You'll get a selection set for the mutation response structure.
Does it support GraphQL interfaces?
No. This generates basic query selections from JSON structure. Interfaces and unions need manual schema work.
How does it handle different types?
Types are inferred from your sample values. If a field sometimes holds different types, you may need to adjust manually.