Why does Next.js prefix the app.js with an underscore?

Question

When I create a Next.js project with the npx create-next-app command than there is an _app.js file under the pages folder. In which case do I need to prefix a file with an underscore in a Next.js project?

question from:https://stackoverflow.com/questions/65857281/why-does-next-js-prefix-the-app-js-with-an-underscore

Answer 1

You're only gonna need that prefix in the default nextjs pages like _app.js, the _document.js, etc. you can look it up in the Next.js Docs, I think the prefix is used to avoid routes like "/app" or "/document", and let them free in case you need use them for your project.