Mercurius

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.

1 APIs 0 Features

GraphQLFastifyNode.jsFederationWebSocketOpen Source

APIs

Mercurius API

GraphQL adapter for Fastify enabling high-performance GraphQL servers and gateways with JIT compilation, query caching, subscriptions, and federation.

GraphQL

Mercurius GraphQL

Mercurius is a GraphQL adapter for Fastify. It exposes a GraphQL endpoint that handles queries, mutations, and subscriptions over HTTP and WebSocket.

GRAPHQL

Resources

GitHubOrganization

Sources

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:
- type: DomainSecurity
  url: security/mercurius-domain-security.yml
- 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