Module not found: Can't resolve 'popper.js'

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Borislav Hadzhiev

Last updated: Mar 17, 2022

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Module not found: Can't resolve 'popper.js' #

To solve the error "Module not found: Error: Can't resolve 'popper.js'", make sure to install the package by opening your terminal in your project's root directory and running the command npm install @popperjs/core and restart your development server.

module not found cant resolve popper js

Open your terminal in your project's root directory (where your package.json file is located) and run the following command:

shell
# 👇️ with NPM npm install @popperjs/core # ---------------------------------------------- # 👇️ with YARN yarn add @popperjs/core

The command will add the @popperjs/core package to the dependencies of your project.

If you prefer to use the CDN scripts instead, refer to the Installation section of the npm page for @popperjs/core.

Popper is used in popular libraries like Bootstrap, Foundation, Material UI, etc.

Make sure to restart your development server and your IDE if necessary. Your dev server won't pick up the changes until you stop it and re-run the npm start command.

If the error is not resolved, try to delete your node_modules and package-lock.json (not package.json) files, re-run npm install and restart your IDE.

shell
# 👇️ delete node_modules and package-lock.json rm -rf node_modules rm -f package-lock.json # 👇️ clean npm cache npm cache clean --force npm install
Make sure to restart your IDE and dev server if the error persists. VSCode often glitches and a reboot solves things sometimes.

If you're still getting the "Module not found: Error: Can't resolve 'popper.js'" error, open your package.json file and make sure it contains the @popperjs/core package in the dependencies object.

package.json
{ // ... rest "dependencies": { "@popperjs/core": "^2.11.4", }, }

The @popperjs/core module should NOT be globally installed or be in your project's devDependencies, it should be in the dependencies object in your package.json file.

You can try to manually add the lines and re-run npm install.

shell
npm install

Or install the latest version of the package:

shell
npm install @popperjs/core@latest

Conclusion #

To solve the error "Module not found: Error: Can't resolve 'popper.js'", make sure to install the package by opening your terminal in your project's root directory and running the command npm install @popperjs/core and restart your development server.

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