TerserFlow

Powered by Terser

TerserFlow is a Javascript and NodeJS obfuscation tool with support for the latest ES6 Javascript syntax, it also encrypts all strings using a method that makes them uneditable after obfuscation.

Contents

• Tech
• Installation
• Usage
  • Command Line Usage
    • CLI Options
  • API Reference
    • Demonstration
• License

Tech

TerserFlow uses a number of npm libraries to work properly:

• Buffer From
• Source Map
• Source Map Support
• commander

Installation

TerserFlow requires Node.js v4+ to run.

From NPM for use as a command line app:

$ npm i terserflow -g

From NPM for programmatic use:

$ npm i terserflow

Usage

This tool is a command-line tool and a Node.js Module meaning it can be used from your computer's command line interface(CLI) and programmatically from a javascript file.

Command line usage

Help interface :

$ terserjs -h

This outputs :

Usage: terserjs [options]

Options:
  -i, --input <inputFile>    input file location of source code to be obfuscated.
  -o, --output [outputFile]  Output file location to save obfuscated code to.
  -e, --extrasecurity        Adds an extra layer of security to the obfuscated code. Negative side effect : Increases file size
  -h, --help                 display help for command

input.js contents (unobfuscated):

console.log("Hello");

Now we will obfuscate it.

$ terserjs -i input.js

output (obfuscated):

Obfuscated Code :
String.prototype.d546280=function(){let t,r=this.match(/.{1,4}/g)||[],e="";for(t=0;t<r.length;t++)e+=String.fromCharCode(parseInt(r[t],16));return e},console.log("00480065006c006c006f".d
546280());

Don't forget to put all the code on one line if you are using this method rather than the save output to file method (remove all the new line characters) like:

String.prototype.d189452=function(){let t,o=this.match(/.{1,4}/g)||[],r="";for(t=0;t<o.length;t++)r+=String.fromCharCode(parseInt(o[t],16));return r},console.log("00480065006c006c006f".d189452());

Save Output Method (recommended):

We are now going to use the same exaples as before but this time we are going to save the output to a file:

$ terserjs -i input.js -o outputFile.js

This is going to create a file called outputFile.js and put the obfuscated code in it (no need to remove any new lines or change the format, it will be ready immediately).

outputFile.js contents (obfuscated)

String.prototype.d189452=function(){let t,o=this.match(/.{1,4}/g)||[],r="";for(t=0;t<o.length;t++)r+=String.fromCharCode(parseInt(o[t],16));return r},console.log("00480065006c006c006f".d189452());

Optionally, you can add the -e flag to a command to add an extra layer of security to the obfuscated code.

Command Line Options

Usage: terserjs [options]

Options:
  -i, --input <inputFile>    input file location of source code to be obfuscated.
  -o, --output [outputFile]  Output file location to save obfuscated code to.
  -e, --extrasecurity        Adds an extra layer of security to the obfuscated code. Negative side effect : Increases
                             file size
  -h, --help                 display help for command

API Reference

Assuming installation via NPM, you can load Terser in your application like this:

const tf = require("terserflow");

There are 2 main ways you can access the output of this function:

Method 1 - Promise

const tf = require("terserflow");

let codeToBeObfuscated = `function printMsg(msg) {console.log("This is a message from the obfuscated printMsg function :  " + msg)}`;
let extraSecurity = true; // This is passed into the obfuscate method below
let resolvedPromise =tf.obfuscate(codeToBeObfuscated, extraSecurity);
//         extraSecurity is optional and false by default ^^^^^^
resolvedPromise.then((obfuscated) => {
console.log(obfuscated);
//Do whatever you want with the variable obfuscated here for example write it to a file
}).catch((error) => {console.error(error);});

Method 2 - async and await

const tf = require("terserflow");

async function obfuscateAndDoSomething(code) {
let extraSecurity = true; // This is passed into the obfuscate method below
let obfuscated = await tf.obfuscate(code, extraSecurity);
// extraSecurity is optional and false by default ^^^^
console.log(obfuscated);
//Do whatever you want with the variable obfuscated here for example write it to a file
}
obfuscateAndDoSomething("alert('Help');");

Try It Out!

License

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