Final answer:
Update npm packages by using 'npm update' with or without specifying a package name to update individual or all packages, and check outdated packages with 'npm outdated'.
Step-by-step explanation:
To update npm packages to their latest version, you can use the command 'npm update' followed by the package name. For example, if you want to update the 'express' package, you would run the command 'npm update express'. This will check for the latest version of the package and update it if necessary. If you want to update all packages in your project, you can use the 'npm update' command without specifying a package name.
Another option is to use the 'npm outdated' command to see which packages in your project are outdated. This will display a list of packages along with their current version, latest version, and a recommendation on whether to update them or not. To update all packages to their latest versions, you can then use the 'npm update' command without specifying a package name.
Remember to regularly update your npm packages to take advantage of the latest features, bug fixes, and security updates.