GraphQL and JSON: How Queries, Mutations, and Responses Are Structured
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 Response Shape A GraphQL response is always a JSON object with two possible top-level keys: Both can be present simultaneously — this is the most counterintuitive aspect of GraphQL for developers coming from REST. A partial success returns with some fields populated and describing what…
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