Why don't have to upload node modeles folder to remote repositories?

When uploading local working respositories to remote repositories like Github, package-lock.json in root folder declares dependencies need to be downloaded by deploying system. So there's no necessary to upload local dependencies, while node modeles folder is often very big.

package-lock.json is automatically generated when running npm install. If there's no package-locak.json file in root foler of project, or there're updates in dependencies, npm will automatically generate or update the file.