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Gasket integrations for Next.js apps. Provides several tools:

  • withGasketData: Injects Gasket Data added during lifecycle onto rendered html
  • withGasketDataProvider: Provides context access to Gasket Data
  • useGasketData: Allows access to Gasket Data from hook


npm i @gasket/nextjs



Use this to extend your Next.js Document to automatically inject a script containing the gasketData for use with the @gasket/data package.


  • withGasketData(options)(Document)


  • [options] - (object) Optional configuration
    • index - (number) Force the script to be inject at a certain child index of the body


This is the simplest and most common setup:

// pages/_document.js
import Document from 'next/document';
import {withGasketData} from '@gasket/nextjs';

export default withGasketData()(Document);

By default this will inject the script in the <body/> after the Next.js <Main/> component, but before <NextScript/>. This also works for a custom Document.

Example forced index

However, there may be situations where you want to inject the gasketData script at a particular child index of the <body/>. To do so, you can set the index in the decorator options.

// pages/_document.js
import Document, {Html, Head, Main, NextScript} from 'next/document'
import { withGasketData } from '@gasket/nextjs';

class MyDocument extends Document {
static async getInitialProps(ctx) {
const initialProps = await Document.getInitialProps(ctx)
return {...initialProps}

render() {
return (
<footer>Some custom content</footer>

export default withGasketData({index: 2})(MyDocument);

In this example, the gasketData script will be injected after the custom <footer/> instead of right after <Main/>.

This is especially useful if you are somehow nesting or extending the <Main/> and <NextScript/> components and the decorator cannot find the right place to inject the script.


Use this to inject gasket data in to provider context to share the gasketData with the useGasketData hook. This is SSR and client side friendly and can be added at the app level or component level.


// pages/_app.js
import { AppProps } from 'next/app';
import { withGasketDataProvider } from '@gasket/nextjs';

const Root = ({ Page, pageProps }) => {
return (
<Page {...pageProps} />

export default withGasketDataProvider()(Root);


Use this hook to access the gasketData provided by the withGasketDataProvider hoc.


// MyComponent.js
import { useGasketData } from '@gasket/nextjs';

export const MyComponent = (props) => {
const gasketData = useGasketData();

return (

How it works

During server side lifecycles' data can be added to the gasketData property. When the withGasketData hoc is added to a custom Next.js _document, the gasketData is added to the rendered html inside a script tag.

The withGasketDataProvider can be added to a Next.js custom _app or react component. This HOC will capture the gasket data from server side gasketData property or the script tag that was rendered to the html. If Next.js is preforming a SSR the data will come from the gasketData property, otherwise the data will come from the script tag. The withGasketDataProvider hoc will then create a provider and inject gasket data into a context that can be consumed by the useGasketData hook.

The useGasketData will provided access to the gasket data within the context of the withGasketDataProvider so the data can be used within any react component.

Please see @gasket/data docs for examples on adding data during SSR lifecycle