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Solving the Module not found: Can’t resolve ‘fs’ Error: Tips and Tricks

Solving the “Module not found: Can’t resolve ‘fs'” error

As a developer, you’ve undoubtedly experienced the frustration of trying to solve an issue that seems as straightforward as adding a module to your code. One common problem that developers often run into is the “Module not found: Can’t resolve ‘fs'” error.

This error indicates that your code is unable to locate the fs module, which is a Node.js module that provides a way to interact with the file system. Fortunately, there are several ways to solve this issue, depending on the context in which you’re working.

Setting browser.fs property to false in package.json

One solution to the “Module not found” issue involves modifying the package.json file by setting the browser.fs property to false. Doing so will tell Webpack not to include the fs module in the browser bundle, effectively removing the error.

To do this, simply locate the package.json file within your project directory, and add the following line:

“browser”: { “fs”: false }

Editing webpack.config.js file

Another potential solution is to edit the webpack.config.js file. This solution is particularly helpful for developers who are using tools like Express or other Node.js frameworks.

Within the file, there is an option to configure the Resolve object. By adding the following lines within the object, you can instruct Webpack to resolve the “fs” module using the “empty” string:

resolve: {

fallback: {

“fs”: false

}

}

Editing node_modules/react-scripts/config/webpack.config.json file (for Create React App users)

If you’re working with a Create React App project, you’ll need to modify a slightly different file.

Within the project’s node_modules folder, locate the react-scripts package, and navigate to the config folder. Within this folder, you’ll find the webpack.config.json file.

Add the following code to the file to resolve the “fs” module using the “empty” string:

“resolve”: {

“fallback”: {

“fs”: false

}

}

Running npm run eject command (for Create React App users)

Another solution for Create React App users is to run the “eject” command. This command will create a new config directory in your project, which contains a webpack.config.js file that you can edit to resolve the “fs” module issue.

Keep in mind that running the “eject” command will permanently modify your project’s file structure, so it’s important to understand the implications before proceeding. Using fs module in Next.js application

If you’re working with a Next.js application, there are several steps you can take to use the fs module successfully.

Using fs module in getStaticProps and getServerSideProps

One common use case for the fs module in Next.js involves using it within the getStaticProps or getServerSideProps functions. Specifically, you can use the module to read data from a file and pass it to the component as a props value.

To do this, you’ll simply need to import the fs module at the top of your component file and use it within the relevant function. There is no need to modify any configuration files in this case.

Removing browser.fs property from package.json file (if using fs module in code)

If you’re using the fs module in your code, rather than simply attempting to resolve it, you’ll need to remove the browser.fs property from your package.json file. Doing so will ensure that Webpack includes the module in the browser bundle, allowing you to use it within your code.

Creating next.config.js file (if not using fs module in code)

If you’re not using the fs module directly in your code, you can create a next.config.js file within your project’s root directory to instruct Next.js to use the “empty” string to resolve the module. Add the following lines to the file:

const path = require(‘path’);

module.exports = {

webpack: (config, { isServer }) => {

if (!isServer) {

config.resolve.fallback.fs = false;

}

return config;

},

};

Adding fallback property to resolve.fallback in webpack.config.js file

Another potential solution for Next.js users involves adding the fallback property to the resolve.fallback object within the webpack.config.js file.

Add the following code to the file, replacing “abc” with the desired fallback value:

resolve: {

fallback: {

“fs”: “abc”

}

}

Adding path or abc property to config object in webpack.config.js file (if getting “Module not found” error for other modules)

Finally, if you’re encountering a “Module not found” error for other modules within webpack.config.js, you can try adding either the path or abc property to the config object, depending on your specific use case. For example, adding the following code to the file will tell Webpack to resolve the “path” module using the “empty” string:

config.resolve = {

…config.resolve,

alias: { path: false }

}

In conclusion, the “Module not found: Can’t resolve ‘fs'” error can be frustrating to deal with, but there are several solutions available depending on your specific context and use case.

By following the steps outlined in this article, you should be able to resolve the issue quickly and get back to writing code. In summary, the “Module not found: Can’t resolve ‘fs'” error can be a common issue for developers, and there are several solutions for resolving it.

Depending on the context and use case, you may need to edit configuration files such as webpack.config.js and package.json, or simply import the fs module correctly within your code. For Next.js users, the specific steps will vary, but creating a next.config.js file or adding fallback properties to the resolve.fallback object usually works.

Overall, it’s important to understand the steps to solve this error to avoid unnecessary frustration, and different approaches may be needed depending on the type of project and the developer’s specific requirements.

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