GraphQL and JSON: Queries, Mutations, Responses
Understand how GraphQL uses JSON for queries, variables, and responses. Learn about introspection, fragments, and how to shape the JSON output you need.
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Tags: graphql, json, api
GraphQL and JSON: How Queries, Mutations, and Responses Are Structured GraphQL runs entirely on JSON. The request body is JSON, the response is JSON, the introspection result is JSON. Understanding the exact structure of each — and where that structure can bite you — is the foundation for building reliable GraphQL clients and servers. This guide walks through the wire format in detail: request shape, response shape, error handling, the N+1 problem, and how GraphQL's JSON contract compares to REST. --- The Request Body Every GraphQL operation — query, mutation, or subscription — is sent as an HTTP POST (almost always to a single endpoint, typically ). The body is a JSON object with up to three fields: * — the GraphQL document as a string. Despite the name, this field carries queries,…
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