Create a directory and make that your working directory.
mkdir example-app
cd example-app
Use npm init to create packge.json in your application
npm init
or
npm init -y
Fist install expressusing npm install
npm i express
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}`);
})
Now run the project
node index.js
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')))
...
Next add express-graphpql, and graphqlusing npm install in the project
npm i express-graphpql graphql
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,
}));
....
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`);
})
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.
Complete code available here - https://github.com/manthanank/graphql-nodejs-expressjs
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