In your Node.js project, there is a package.json file, which includes all the npm modules, your project depends on. To automatically add a npm module on install to this file, you have to enter the following command.
npm i bcrypt --save
The key is “–save”. Through that parameter, bcrypt will automatically be added to your package.json file.
If there are modules, which are only used for development, these can be installed and declared as development dependencies.
npm i nodemon --save-dave