Question

What Is Obfuscation in javascript?

Answer 1

Obfuscation is the deliberate act of creating obfuscated javascript code(i.e, source or machine code) that is difficult for humans to understand. It is something similar to encryption, but a machine can understand the code and execute it. Let's see the below function before Obfuscation,

function greeting() {
  console.log("Hello, welcome to JS world");
}

And after the code Obfuscation, it would be appeared as below,

eval(
  (function (p, a, c, k, e, d) {
    e = function (c) {
      return c;
    };
    if (!"".replace(/^/, String)) {
      while (c--) {
        d[c] = k[c] || c;
      }
      k = [
        function (e) {
          return d[e];
        },
      ];
      e = function () {
        return "\\w+";
      };
      c = 1;
    }
    while (c--) {
      if (k[c]) {
        p = p.replace(new RegExp("\\b" + e(c) + "\\b", "g"), k[c]);
      }
    }
    return p;
  })(
    "2 1(){0.3('4, 7 6 5 8')}",
    9,
    9,
    "console|greeting|function|log|Hello|JS|to|welcome|world".split("|"),
    0,
    {}
  )
);