---
description:
  Express is the most popular web framework for Node.js. It is a minimalist framework that provides
  a robust set of features to handle HTTP on Node.js applications.
---

import { Callout } from '@theguild/components'

# Integration with Express

[Express is the most popular web framework for Node.js.](https://expressjs.com/) It is a minimalist
framework that provides a robust set of features to handle HTTP on Node.js applications. You can
easily integrate Hive Gateway into your Express application with a few lines of code.

## Example

```ts
import express from 'express'
import { createGatewayRuntime } from '@graphql-hive/gateway'

const app = express()

const serveRuntime = createGatewayRuntime(/* Your configuration */)

// Bind Hive Gateway to the graphql endpoint to avoid rendering the playground on any path
app.use(serveRuntime.graphqlEndpoint, serveRuntime)

app.listen(4000, () => {
  console.log('Running a GraphQL API server at http://localhost:4000/graphql')
})
```

## Using Helmet

If you are using [Helmet](https://helmetjs.github.io/) to set your
[Content Security Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP), you can use the
following configuration:

```ts
app.use(
  helmet({
    contentSecurityPolicy: {
      directives: {
        'style-src': ["'self'", 'unpkg.com'],
        'script-src': ["'self'", 'unpkg.com', "'unsafe-inline'"],
        'img-src': ["'self'", 'raw.githubusercontent.com']
      }
    }
  })
)
```

### Isolate GraphiQL configuration

To avoid applying this configuration to other endpoints you may have on your Express server, you can
use `Express.Router` to create a new router instance and apply the configuration only to the Hive
Gateway endpoint.

```ts
import express from 'express'
import helmet from 'helmet'
import { createGatewayRuntime } from '@graphql-hive/gateway'

const app = express()

const serveRuntime = createGatewayRuntime(/* Your configuration */)
const hiveGWRouter = express.Router()
// GraphiQL specefic CSP configuration
hiveGWRouter.use(
  helmet({
    contentSecurityPolicy: {
      directives: {
        'style-src': ["'self'", 'unpkg.com'],
        'script-src': ["'self'", 'unpkg.com', "'unsafe-inline'"],
        'img-src': ["'self'", 'raw.githubusercontent.com']
      }
    }
  })
)
hiveGWRouter.use(serveRuntime)

// By adding the Hive Gateway router before the global helmet middleware,
// you can be sure that the global CSP configuration will not be applied to the Hive Gateway endpoint
app.use(serveRuntime.graphqlEndpoint, hiveGWRouter)

// Add the global CSP configuration for the rest of your server.
app.use(helmet())

// You can know register your other endpoints that will not be affected by the GraphiQL CSP configuration
app.get('/hello', (req, res) => {
  res.send('Hello World!')
})

app.listen(4000, () => {
  console.log('Running a GraphQL API server at http://localhost:4000/graphql')
})
```
