GraphQL SDL

GraphQL is a query language and runtime for APIs, defined by the GraphQL Specification. The GraphQL Schema Definition Language (SDL) is the declarative format used to define types, queries, mutations, and subscriptions on a GraphQL server. The spec is governed by the GraphQL Foundation, a Linux Foundation project, under the OWFa 1.0 license. The current spec edition is the October 2021 release with continued Working Drafts.

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this
  • find_apisBrowse and filter every API in the catalog.
  • get_api_artifactsOne API's artifacts, grouped by type.
  • get_openapiThe primary OpenAPI for this API.
  • find_similar_apisAPIs that look like this one.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools

Call it yourself

curl for this page
This API
curl "https://apis.io/api/v1/apis/graphql"
All apis
curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

A second provider on the same verified email joins the account you already have.

API entry from apis.yml

apis.yml Raw ↑
aid: specifications:graphql
name: GraphQL SDL
description: GraphQL is a query language and runtime for APIs, defined by the GraphQL Specification. The
  GraphQL Schema Definition Language (SDL) is the declarative format used to define types, queries, mutations,
  and subscriptions on a GraphQL server. The spec is governed by the GraphQL Foundation, a Linux Foundation
  project, under the OWFa 1.0 license. The current spec edition is the October 2021 release with continued
  Working Drafts.
humanURL: https://graphql.org/
baseURL: https://spec.graphql.org/
tags:
- GraphQL
- SDL
- Query Language
- Schema
- GraphQL Foundation
- Linux Foundation
properties:
- type: Documentation
  url: https://graphql.org/learn/
- type: Specification
  url: https://spec.graphql.org/October2021/
  title: GraphQL Specification (October 2021)
- type: Specification
  url: https://spec.graphql.org/draft/
  title: GraphQL Specification (Working Draft)
- type: GitHubOrganization
  url: https://github.com/graphql
- type: GitHubRepository
  url: https://github.com/graphql/graphql-spec
- type: Governance
  url: https://graphql.org/foundation/
  title: GraphQL Foundation
- type: License
  url: https://www.openwebfoundation.org/the-agreements/the-owf-1-0-agreements-granted-claims/owfa-1-0
  title: OWFa 1.0
- type: Examples
  url: https://raw.githubusercontent.com/api-evangelist/specifications/refs/heads/main/examples/graphql-example.json
  title: GraphQL Specification Record Example
- url: graphql/specifications-graphql.md
  type: GraphQL