What is JSON to GraphQL Query Generator?
This tool converts JSON data into GraphQL query or mutation strings. It analyzes the JSON structure to generate proper GraphQL field selections, handling nested objects as nested selections, arrays as list fields, and primitives as leaf fields. It also generates variable declarations for parameterized queries.
How to Use
- Set the operation name and choose query or mutation type
- Paste your JSON data into the input area
- Click "Generate" to create the GraphQL query/mutation string
- Copy the output and use it in your GraphQL client or server
Why Use This Tool?
Tips & Best Practices
- Use realistic sample data for the most accurate query generation
- Nested JSON objects become nested GraphQL field selections
- Arrays are treated as list fields with the first element used as the selection template
- Customize the operation name to match your API conventions
Frequently Asked Questions
How are JSON structures converted to GraphQL queries?
JSON objects become nested field selections with curly braces, arrays become list fields using the first element as a template, and primitive values (strings, numbers, booleans) become leaf fields in the selection set.
What are GraphQL variables?
Variables allow you to parameterize your GraphQL queries. Instead of hardcoding values, you declare them as variables ($varName: Type) in the operation signature and pass them separately. This makes queries reusable and cacheable.
Can I generate mutations?
Yes, select "Mutation" from the type dropdown. The structure is the same as queries, but the operation keyword changes from "query" to "mutation".
How are JSON types mapped to GraphQL types?
JSON strings → String, integers → Int, floats → Float, booleans → Boolean, null → String, arrays → [Type], and objects → nested selections.
Is my data sent to a server?
No, all processing happens entirely in your browser. Your JSON data never leaves your device.