Mercurius

aid: mercurius
name: Mercurius
description: "High-performance GraphQL server for Fastify with Just-In-Time compilation
  via graphql-jit, automatic query caching, N+1 prevention via dataloader integration,
  federation support, subscription via WebSocket, batched query support, and GraphQL
  Playground integration."
type: Index
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
url: https://mercurius.dev/
baseURL: https://mercurius.dev/
created: 2026-06-14
modified: 2026-06-14
specificationVersion: '0.19'
tags:
  - GraphQL
  - Fastify
  - Node.js
  - Federation
  - WebSocket
  - Open Source
apis:
  - aid: mercurius:api
    name: Mercurius API
    description: "GraphQL adapter for Fastify enabling high-performance GraphQL servers
      and gateways with JIT compilation, query caching, subscriptions, and federation."
    tags:
      - GraphQL
      - Fastify
      - Federation
      - Subscriptions
    humanURL: https://mercurius.dev/
    baseURL: https://mercurius.dev/
    properties:
      - url: https://mercurius.dev/
        type: Documentation
      - url: graphql/mercurius-graphql.md
        type: GraphQL
common:
  - url: https://mercurius.dev/
    type: Website
  - url: https://mercurius.dev/
    type: Documentation
  - url: https://www.linkedin.com/company/mercuriusinc
    type: LinkedIn
  - url: https://github.com/mercurius-js
    type: GitHubOrganization
  - url: https://github.com/mercurius-js/mercurius/blob/master/LICENSE
    type: Licensing
  - url: plans/mercurius-plans.md
    type: Plans
  - url: rate-limits/mercurius-rate-limits.md
    type: RateLimits
  - url: finops/mercurius-finops.md
    type: FinOps
maintainers:
  - FN: Kin Lane
    email: kin@apievangelist.com