For Creators
Dynamic NFTs
Getting Started

Getting Started with Dynamic NFTs

This guide will walk you through creating your first Dynamic NFT on Genify. We'll cover the basic setup, code structure, and essential concepts.

Prerequisites

  • Basic knowledge of JavaScript
  • Familiarity with P5.js or similar creative coding libraries
  • A modern web browser
  • A code editor

Project Setup

1. File Structure

Create a new directory for your project with the following structure:

your-project/
├── index.html
├── p5.js          # Download from p5js.org
├── genify.js      # Core random generator
└── sketch.js      # Your artwork code
// genify.js
class Genify {
  constructor() {
    this.genhash = this._getHashFromUrl();
    this.genhash =
      this.genhash && this.genhash.length === 66
        ? this.genhash
        : this._generateHash();
    this._initRandom();
    this._setupMessageListener();
  }
 
  _getHashFromUrl() {
    const params = new URLSearchParams(window.location.search);
    const hash = params.get("genhash");
    return hash && hash.length === 66 ? hash : null;
  }
 
  _generateHash() {
    return (
      "0x" +
      [...Array(64)]
        .map(() => Math.floor(Math.random() * 16).toString(16))
        .join("")
    );
  }
 
  _initRandom() {
    this._random = this._createAlea(this._crc32(this.genhash));
  }
 
  _setupMessageListener() {
    window.addEventListener("message", (event) => {
      if (event.data === "gen_getFeatures") {
        parent.postMessage(
          {
            id: "gen_getFeatures",
            data: window.$genFeatures,
          },
          "*"
        );
      }
    });
  }
 
  _crc32(str) {
    const table =
      "00000000 77073096 EE0E612C 990951BA 076DC419 706AF48F E963A535 9E6495A3 0EDB8832 79DCB8A4 E0D5E91E 97D2D988 09B64C2B 7EB17CBD E7B82D07 90BF1D91 1DB71064 6AB020F2 F3B97148 84BE41DE 1ADAD47D 6DDDE4EB F4D4B551 83D385C7 136C9856 646BA8C0 FD62F97A 8A65C9EC 14015C4F 63066CD9 FA0F3D63 8D080DF5"
        .split(" ")
        .map((s) => parseInt(s, 16));
 
    let crc = -1;
    for (let i = 0; i < str.length; i++) {
      crc = (crc >>> 8) ^ table[(crc ^ str.charCodeAt(i)) & 0xff];
    }
    return (crc ^ -1) >>> 0;
  }
 
  _createAlea(seed) {
    function Mash() {
      let n = 4022871197;
      return function (r) {
        let t, s, f;
        for (let u = 0, e = 0.02519603282416938; u < r.length; u++)
          (s = r.charCodeAt(u)),
            (f = e * (n += s) - ((n * e) | 0)),
            (n = 4294967296 * ((t = f * ((e * n) | 0)) - (t | 0)) + (t | 0));
        return (n | 0) * 2.3283064365386963e-10;
      };
    }
 
    return function () {
      let m = Mash();
      let a = m(this.genhash.slice(0, 22));
      let b = m(this.genhash.slice(22, 44));
      let c = m(this.genhash.slice(44));
      let x = 1;
 
      seed = seed.toString();
      a -= m(seed);
      b -= m(seed);
      c -= m(seed);
      a < 0 && a++;
      b < 0 && b++;
      c < 0 && c++;
 
      return function () {
        let y = x * 2.3283064365386963e-10 + a * 2091639;
        (a = b), (b = c);
        return (c = y - (x = y | 0));
      };
    }.call(this);
  }
 
  reset() {
    this._initRandom();
  }
 
  random() {
    return this._random();
  }
 
  randInt(min, max) {
    min = Math.ceil(min);
    max = Math.floor(max);
    return Math.floor(this.random() * (max - min)) + min;
  }
 
  randFloat(min, max) {
    return this.random() * (max - min) + min;
  }
 
  choice(arr) {
    return arr[this.randInt(0, arr.length)];
  }
 
  setFeatures(features) {
    window.$genFeatures = features;
    console.table(window.$genFeatures);
    parent.postMessage(
      {
        id: "gen_getFeatures",
        data: window.$genFeatures,
      },
      "*"
    );
  }
 
  renderDone() {
    window.$renderOK = true;
    parent.postMessage(
      {
        id: "gen_renderDone",
        data: true,
      },
      "*"
    );
  }
}
 
window.genify = new Genify();

2. Required Files

Make sure all files are in the same directory. Do not use CDN links - all dependencies should be local files.

<!DOCTYPE html>
<html>
  <head>
    <script src="p5.js"></script>
    <script src="genify.js"></script>
    <script src="sketch.js"></script>
  </head>
  <body>
    <main></main>
  </body>
</html>

3. Basic P5.js Template

// sketch.js
function setup() {
  createCanvas(1024, 1024);
  // Important: Set random seed from genify
  let seed = ~~(genify.random() * 123456789);
  randomSeed(seed);
  noiseSeed(seed);
  noLoop();
}
 
function draw() {
  background(220);
  // Your art generation code here
 
  // Set artwork attributes
  genify.setFeatures({
    background: "light",
    style: "geometric",
  });
 
  // Notify completion
  genify.renderDone();
}

Important Notes

Packaging Your Project

When creating your project archive, zip the files directly:

# ✅ Correct: Zip files from inside the project directory
cd your-project
zip -r ../my-artwork.zip ./*
 
# ❌ Wrong: Don't zip the folder itself
zip -r my-artwork.zip your-project/  # This creates wrong paths
⚠️

Wrong Zip Archive When this error occurs, it means that the zip file is not correctly packaged.

Using Random Values

Always use genify's random functions instead of Math.random():

// ✅ Correct
let value = genify.random();
let number = genify.randInt(0, 10);
let color = genify.choice(["red", "blue", "green"]);
 
// ❌ Wrong
let value = Math.random(); // Don't use Math.random

Setting Features

All feature values must be strings:

// ✅ Correct
genify.setFeatures({
  background: "light",
  count: "5",
  size: "42.5",
});
 
// ❌ Wrong
genify.setFeatures({
  background: "light",
  count: 5, // Number not allowed
  size: 42.5, // Must be string
});

Next Steps

IntroductionBasic Example