Gruntfile.js and package.json for the task uglify

//Gruntfile.js
module.exports = function(grunt){
    grunt.initConfig({
        pkg: grunt.file.readJSON('package.json'),
        uglify: {
            options: {
                mangle: true
            },
            mytarget: {
                files: {
                    'dest/output.min.js' : ['src/*.js']
                }
            }//end of my_target
        }//end of uglify
    });
    grunt.loadNpmTasks('grunt-contrib-uglify');

    grunt.registerTask('default',['uglify']);
};


//package.json
{
  "name": "Uglification",
  "version": "0.1.0",
  "description": "used for minification of js files",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [
    "uglify",
    "minify",
    "compress"
  ],
  "author": "Demon",
  "license": "BSD-2-Clause",
  "devDependencies": {
    "grunt": "~0.4.1",
    "grunt-contrib-uglify": "~0.2.7"
  }
}