Nexus Schema

Declarative, code-first and strongly typed GraphQL schema construction for TypeScript & JavaScript.

This is a component of the Nexus Framework but can be used as well standalone.

Installation

npm install @nexus/schema graphql

Note you must also add graphql. Nexus Schema pins to it as a peer dependency.

Features

• Expressive, declarative API for building schemas
• Full type-safety for free
• Powerful plugin system
• No need to re-declare interface fields per-object
• Optionally possible to reference types by name (with autocomplete)
  Rather than needing to import every single piece of the schema
• Interoperable with vanilla graphql-js types, and it's just a GraphQLSchema
  So it fits in just fine with existing community solutions of apollo-server, graphql-middleware, etc.
• Inline function resolvers
  For when you need to do simple field aliasing
• Auto-generated graphql SDL schema
  Great for when seeing how any code changes affected the schema
• DRY-up schema design
  Create higher level "functions" which wrap common fields

Example

import { queryType, stringArg, makeSchema } from "@nexus/schema";
import { GraphQLServer } from "graphql-yoga";

const Query = queryType({
  definition(t) {
    t.string("hello", {
      args: { name: stringArg({ nullable: true }) },
      resolve: (parent, { name }) => `Hello ${name || "World"}!`,
    });
  },
});

const schema = makeSchema({
  types: [Query],
  outputs: {
    schema: __dirname + "/generated/schema.graphql",
    typegen: __dirname + "/generated/typings.ts",
  },
});

const server = new GraphQLServer({
  schema,
});

server.start(() => `Server is running on http://localhost:4000`);

More examples can be found in the /examples directory:

• githunt-api
• ts-ast-reader
• apollo-fullstack
• star-wars
• kitchen-sink

Documentation

You can find the docs for Nexus Schema here.

Migrate from SDL

If you've been following an SDL-first approach to build your GraphQL server and want to see what your code looks like when written with GraphQL Nexus, you can use the SDL converter.