JSON to GraphQL Converter
Infer GraphQL types, queries, and mutations instantly from sample JSON API responses.
Ready to use JSON to GraphQL Converter?
Runs instantly in your browser sandbox. No sign-up required.
Automatically maps JSON primitives to GraphQL Int, Float, String, and Boolean types.
Extracts child objects into standalone GraphQL Object Types.
Generates Query and Mutation definitions alongside types.
Automated GraphQL Schema Synthesis
Migrating existing REST APIs to GraphQL requires defining strict GraphQL Object Types. Our JSON to GraphQL generator analyzes response payloads and synthesizes valid GraphQL SDL (Schema Definition Language) code.
Sample Type Generation
# Generated GraphQL Schema
type User {
id: Int!
username: String!
email: String!
isActive: Boolean!
}
type Query {
getUser(id: Int!): User
}Frequently Asked Questions
How does the converter infer GraphQL types from JSON values?
The generator inspects primitive data types: integers map to GraphQL Int, floats map to Float, booleans map to Boolean, strings map to String, and objects become nested GraphQL types.
Does the tool generate query and mutation definitions?
Yes. Along with GraphQL Object Type definitions, the tool generates boilerplate Query and Mutation schemas based on your root JSON keys.