This is a basic example to get you started.

1. Setup Project:

Start by creating a new directory for your project and initializing a new Node.js project.

 mkdir graphql-practical
 cd graphql-practical
 npm init -y

2. Install Dependencies:

Install the necessary dependencies using npm.

 npm install express express-graphql graphql

3. Create Server:

Create a file named `server.js` and set up a basic Express server with GraphQL.

 const express = require('express');
 const { graphqlHTTP } = require('express-graphql');
 const { buildSchema } = require('graphql');

 // Define your GraphQL schema
 const schema = buildSchema(`
   type Query {
     hello: String
   }
 `);

 // Define resolvers
 const root = {
   hello: () => 'Hello, GraphQL!'
 };

 // Create an Express app
 const app = express();

 // Create a route for handling GraphQL requests
 app.use('/graphql', graphqlHTTP({
   schema: schema,
   rootValue: root,
   graphiql: true // Enable GraphiQL for easy testing
 }));

 // Start the server
 const PORT = 3000;
 app.listen(PORT, () => {
   console.log(`Server is running at http://localhost:${PORT}/graphql`);
 });

4. Run the Server:

Execute the following command to run your server.

 node server.js

Your GraphQL server should be running at http://localhost:3000/graphql.

5. Test with GraphQL:

Open your browser and navigate to http://localhost:3000/graphql. You should see the GraphiQL interface.

Try running the following query:

 {
   hello
 }

You should get the response `“Hello, GraphQL!”`.