gistfile1.js

#!/usr/bin/env node

var fs = require("fs")
  , path = require("path")
  , npm = require("npm")
  , readJSON = require("npm/utils/read-json");

npm.load(function(){
  readJSON(process.argv[2], function(err, data){
    if(err) throw err;
    if(data["dependencies"]) {
      var d = [];
      Object.keys(data.dependencies).forEach(function (dep) {
        d.push(dep+"@"+data.dependencies[dep])
      });
    
      npm.commands.install(d, function(){
        console.log("done.");
        process.exit(0);
      });
    } else {
      process.exit(0);
    }
  });
});