GraphQL Rust resolvers + Deno Deploy = 🚀

This repo contains the code I spiked to explore the idea of combining a JS-based GraphQL server with resolvers written in Rust (via Wasm), deployed to the edge with Deno Deploy.

Many people asked me to share more details after I tweeted about it, so here it is.

Usage

Build Rust resolvers and start local GraphQL server (requires Deno and Rust to be installed):

deno task dev

Optionally deploy the server to Deno Deploy (requires deployctl):

export DENO_DEPLOY_TOKEN=...
export DENO_DEPLOY_PROJECT=...

deno task deploy

Test the resolvers with curl:

❯ GRAPHQL_ENDPOINT=https://${DENO_DEPLOY_PROJECT}.deno.dev  # or http://localhost:8000

❯ curl $GRAPHQL_ENDPOINT --json '{"query": "query {username(id: 1234)}"}'
{"data":{"username":"User #1234"}}

❯ curl $GRAPHQL_ENDPOINT --json '{"query": "mutation {counter}"}'
{"data":{"counter":1}}
❯ curl $GRAPHQL_ENDPOINT --json '{"query": "mutation {counter}"}'
{"data":{"counter":2}}
❯ curl $GRAPHQL_ENDPOINT --json '{"query": "mutation {counter}"}'
{"data":{"counter":3}}

You can also open the endpoint in a browser for interactive testing with GraphiQL.