Mercurius

Lesson in the GraphQL Roadmap · Stage 9: Pagination

Last updated 14 September 2026

What is Mercurius?

Mercurius is a high-performance GraphQL server library for Fastify, offering excellent performance and minimal memory usage. It provides schema-first development, built-in caching, subscriptions support, and integration with Fastify's ecosystem for building fast, scalable GraphQL APIs.

Study this in the interactive course See the whole GraphQL roadmap

Free resources to learn Mercurius

Open sourceMercurius Repository
ArticleMercurius Documentation

Mercurius: common questions

Can I learn Mercurius in Hindi?

This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain Mercurius in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.

Is this Mercurius tutorial for beginners?

It is lesson 61 of 65 in the free GraphQL roadmap, in stage 9, Pagination. If you are new to GraphQL, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.