Server-side Image Generation with Node.js

const fs = require('fs');
// import polotno-node API
const { createInstance } = require('polotno-node');

async function run() {
  // create working instance
  const instance = await createInstance({
    // to create your own API key please go here: https://polotno.com/cabinet
    key: 'nFA5H9elEytDyPyvKL7T',
  });

  // load sample json
  const json = JSON.parse(fs.readFileSync('polotno.json'));
  // here you can manipulate JSON somehow manually
  // for example replace some images or change text

  // then we can convert json into image
  const imageBase64 = await instance.jsonToImageBase64(json); // default is PNG
  // write image into local file
  fs.writeFileSync('out.png', imageBase64, 'base64');

  // also we can export design into lower size
  // and change image type
  const jpegImage = await instance.jsonToImageBase64(json, {
    pixelRatio: 0.5, // make image twice smaller
    mimeType: 'image/jpeg',
  });
  fs.writeFileSync('out.jpg', jpegImage, 'base64');

  // enable rich text rendering if your design uses it
  const richTextImage = await instance.jsonToImageBase64(json, {
    richTextEnabled: true, // enable rich text support
  });
  fs.writeFileSync('out-rich.png', richTextImage, 'base64');

  // close instance
  instance.close();
}

run();

const instance = await createInstance({
  key: 'nFA5H9elEytDyPyvKL7T',
  navigationTimeout: 240000, // 4 minutes, for a slow machine
});

await instance.jsonToVideoFile(json, 'out.mp4', {
  blockPrivateNetwork: true, // also block loopback and private addresses
  fetchGuard: (url) => isAllowed(url), // your own rule, replaces the checks above
});