Customizing the _app.js and _document.js Pages
Learn to customize page initialization and HTML tags and to extend the Document class with custom scripts.
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There are certain cases where we need to take control over page initialization so that every time we render a page, Next.js will need to run certain operations before sending the resulting HTML to the client. To do that, the framework allows us to create two new files, called _app.js and _document.js, inside our pages/ directory.
The _app.js page
By default, Next.js ships with the following pages/_app.js file:
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