Starter template for use graphql-yoga with express(typescript)

Here’s a starter template to set up a TypeScript project using express with graphql-yoga for a GraphQL server.

Steps

1. Initialize the Project: First, set up a new Node.js project.

mkdir graphql-yoga-express && cd graphql-yoga-express
npm init -y

1. Install Dependencies: Install the required packages.

npm install express graphql graphql-yoga
npm install -D typescript ts-node @types/express @types/node

1. Set Up TypeScript: Initialize TypeScript configuration.

npx tsc --init

Adjust your tsconfig.json (optional but recommended changes):

{
  "compilerOptions": {
    "target": "es6",
    "module": "commonjs",
    "rootDir": "./src",
    "outDir": "./dist",
    "strict": true,
    "esModuleInterop": true,
    "skipLibCheck": true
  }
}

1. Project Structure: Create the following project structure.

graphql-yoga-express
├── src
│   ├── index.ts         # Entry point of the server
│   ├── schema.ts        # Define GraphQL schema and resolvers
├── package.json
├── tsconfig.json

1. Create GraphQL Schema and Resolvers: Inside src/schema.ts, define a basic schema and resolver.

// src/schema.ts
import { createSchema } from 'graphql-yoga';

const typeDefs = /* GraphQL */ `
  type Query {
    hello(name: String): String!
  }
`;

const resolvers = {
  Query: {
    hello: (_: unknown, { name }: { name: string }) => `Hello, ${name || 'World'}!`,
  },
};

export const schema = createSchema({
  typeDefs,
  resolvers,
});

1. Set Up the Server with Express: Inside src/index.ts, create an Express server and use graphql-yoga middleware.

// src/index.ts
import express from 'express';
import { createYoga } from 'graphql-yoga';
import { schema } from './schema';

const app = express();

const yoga = createYoga({ schema });
app.use('/graphql', yoga);

const PORT = process.env.PORT || 4000;

app.listen(PORT, () => {
  console.log(`Server is running at http://localhost:${PORT}/graphql`);
});

1. Run the Server: Add a script to package.json for running the server in development mode.

"scripts": {
  "start": "ts-node src/index.ts"
}

Then, start the server:

npm start

Test the GraphQL Endpoint

Open http://localhost:4000/graphql in your browser, and test the query:

query {
  hello(name: "GraphQL-Yoga")
}

You should receive a response like:

{
  "data": {
    "hello": "Hello, GraphQL-Yoga!"
  }
}

This setup provides a basic Express server with graphql-yoga as the GraphQL layer. You can expand the schema and resolvers as needed.