Save a JSON response containing a base64 value to a PDF file within Postman. Added this script to the `Tests` tab and view the response in the Visualiser. Reference post - https://medium.com/younited-tech-blog/serve-yourself-combining-postman-and-express-3fd1dd9f545c

saveToPDF.js

let myPDFData = {
    contract: Buffer.from(pm.response.json().contract, 'base64'),
    reference: pm.response.json().reference
} 

let template = `
<script src="https://unpkg.com/jspdf@latest/dist/jspdf.min.js"></script>

<button onclick="savePDF()">Save To PDF</button>
 
<script type="text/javascript">
function savePDF() {

  let pdf = new jsPDF();
  
  pdf.text("${myPDFData.contract}", 10, 10);
  pdf.save("${myPDFData.reference}.pdf");
}
</script>
`
pm.visualizer.set(template, myPDFData);