moshest / graphql-sse-mercurius

Example showing how to use graphql-sse with Mercurius.

graphql-see-mercurius

Example showing how to use graphql-sse with Mercurius on Vercel.

It builds on top of https://www.the-guild.dev/blog/graphql-over-sse#with-fastify and adds mercurius to the picture, with minor adaptations.

Requirements

• Node LTS

Setup

• npm i
• node server.js

In a different terminal window run:

• node client.js

This will check that queries and subscriptions work over plain HTTP (mercurius) and SSE (graphql-sse)

How it works

• Exposes the same schema both via mercurius and graphql-see
• Mercurius listens on path /graphql whereas graphql-see on /graphql-stream
• Any GraphQL operations can go to either one or the other
• Fastify serverless configuration is used to deploy to Vercel