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Error: Cannot find module express in Node JS

If you're getting the "Cannot find module 'express'" error in your Node.js project, there are a few steps you can take to resolve it.

Resolving Error: Cannot find module express in Node JS

  1. First, make sure you have the express package installed in your project. To do this, open your terminal in the root directory of your project (the one that contains your package.json file) and run the following command:
npm install express
  1. If your project doesn't have a package.json file, you can create one by running the following command:
npm init -y
  1. If you're using TypeScript, you'll also need to install the @types/express package. You can do this by running the following command:
npm install @types/express --save-dev
  1. If you've installed the express package and are still getting the error, you may need to delete the node_modules directory and the package-lock.json file and re-run the npm install command. To do this, open your terminal in the root directory of your project and run the following commands:
rm -rf node_modules package-lock.json
npm install
  1. If you're still having trouble, you may need to restart your code editor (e.g. VSCode). If you're getting permissions errors when running the npm install command, you can try re-running the command with sudo, like this:
sudo npm install
  1. Finally, check your package.json file to make sure the express package is listed under the "dependencies" object, and not under "devDependencies". If it's not listed at all, you can try adding it manually and re-running the npm install command.

If you've tried all of these steps and are still getting the "Cannot find module 'express'" error, there may be some other issue causing the problem. You may want to check for any other error messages that might give you more clues about what's going wrong.

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