package.json

 PACKAGE.JSON

it contains descriptive and functional metadata about a project,such as a name ,version and dependencies

metadata- data about data

package.son of figlet

{
  "dependencies": {
    "figlet": "^1.8.0"
  }
}

we can install the node modules of the package even when deleted if we have package.son in the direectory. as it contains the dependecy and version 

command npm install (no need of package name too)

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