Using Node.js with GraphQL

Introduction to GraphQL

GraphQL is a query language for APIs that allows clients to specify exactly what data they need.

Step 1: Install GraphQL

Install GraphQL using npm.

npm install graphql

Step 2: Create a New GraphQL Schema

Create a new GraphQL schema.

const { GraphQLSchema, GraphQLObjectType, GraphQLString } = require('graphql');
const schema = new GraphQLSchema({
  query: new GraphQLObjectType({
    name: 'Query',
    fields: () => ({
      hello: {
        type: GraphQLString,
        resolve: () => 'Hello World!'
      }
    })
  })
});

Step 3: Create a GraphQL Server

Create a GraphQL server using Express.

const express = require('express');
const app = express();
const { graphqlHTTP } = require('express-graphql');
app.use('/graphql', graphqlHTTP({
  schema: schema,
  graphiql: true
}));

Step 4: Run the Server

Run the server.

node server.js

Open a web browser and navigate to http://localhost:3000/graphql to see the GraphQL API in action.