How to Resolve the `Can't Resolve Module` Error in Next.js

If you are encountering the Module not found: Can't resolve 'fs' error in Next.js, don’t worry, there is a simple solution. This error typically occurs when you attempt to import Node.js modules within a Next.js page, but fail to use the imported method within the getStaticProps() function.

To illustrate, let’s consider the following code snippet:

import { getData } from '../lib/data'

//...

export async function getStaticProps() {
  const data = getData()
  return {
    props: {
      data,
    },
  }
}

In this example, if we comment out the line const data = getData(), Next.js will throw an error stating that the 'fs' module could not be found. This happens because fs is the first module imported in the lib/data file. The same issue can occur with any other Node.js library that you import first.

The reason behind this error is that the code inside getStaticProps() is only executed when running in a server environment. If we don’t invoke the Node.js function within this context, Next.js is unaware of it and throws the module resolution error.

To fix this issue, simply ensure that you are using the imported method or library within the getStaticProps() function. This allows Next.js to properly resolve the modules and prevent the error from occurring.

By following this approach, you can resolve the Can't Resolve Module error in Next.js and ensure seamless execution of your code.