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Manthan Ankolekar
Manthan Ankolekar

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Getting Started with Node.js, Express.js, and GraphQL: A Beginner's Example Project

Create a directory and make that your working directory.

mkdir example-app
cd example-app
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Use npm init to create packge.json in your application

npm init

or

npm init -y
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Fist install expressusing npm install

npm i express
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Next create index.js file

const express = require('express')
const app = express()
const port = 3000

app.get('/', (req, res) => {
  res.send('Hello World!')
})

app.listen(port, () => {
  console.log(`Example app listening on port ${port}`);
})
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Now run the project

node index.js
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Output will get : Example app listening on port 3000

Then, load http://localhost:3000/in a browser to see the output.

Now will serve static files in project by creating public folder and adding index.html in it.

Next updating index file with below code.

...

const path = require('path')
app.use('/', express.static(path.join(__dirname, 'public')))

...
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Next add express-graphpql, and graphqlusing npm install in the project

npm i express-graphpql graphql
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Now update index.js with following

...

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

// Construct a schema, using GraphQL schema language
const schema = buildSchema(`
  type Query {
    hello: String
  }
`);

// The root provides a resolver function for each API endpoint
const root = {
  hello: () => {
    return 'Hello world!';
  },
};

...

app.use('/graphql', graphqlHTTP({
    schema: schema,
    rootValue: root,
    graphiql: true,
  }));

....
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Here is the final index.js file with complete code

const express = require('express')
const app = express()
const port = 3000

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

// Construct a schema, using GraphQL schema language
const schema = buildSchema(`
  type Query {
    hello: String
  }
`);

// The root provides a resolver function for each API endpoint
const root = {
  hello: () => {
    return 'Hello world!';
  },
};

const path = require('path')
app.use('/', express.static(path.join(__dirname, 'public')))

app.get('/', (req, res) => {
  res.send('Hello World!')
})

app.use('/graphql', graphqlHTTP({
    schema: schema,
    rootValue: root,
    graphiql: true,
  }));

app.listen(port, () => {
  console.log(`Example app listening on port ${port} and GraphQL server listening on port ${port}/graphql`);
})
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Now run the project and you will see output : Example app listening on port 3000 and GraphQL server listening on port 3000/graphql

Then load http://localhost:3000/graphql in a browser to see the output.

img-preview

Complete code available here - https://github.com/manthanank/graphql-nodejs-expressjs

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