If you need to use our rest API from the server, we recommend using the Rest API Utility package as it handles many edge cases when dealing with files in node.
When using the utility package in node, the API is the exact same, however you must pass a ReadStream instead of a Blob.
Example:
const Utils = require('@pdftron/pdfjs-express-utils').default;
const fs = require('fs');
const u = new Utils({
serverKey: 'YOUR_KEY_HERE'
});
(async () => {
const readStream = fs.createReadStream('myPDF.pdf');
const xfdf = `<?xml version="1.0" encoding="UTF-8" ?><xfdf xmlns="http://ns.adobe.com/xfdf/" xml:space="preserve"><pdf-info xmlns="http://www.pdftron.com/pdfinfo" version="2" import-version="3" /><fields /><annots><square page="0" rect="414.95599999999996,1393.51,635.3059999999999,1546.05" color="#000000" flags="print" name="5616161f-3466-9898-dfea-228357f8c855" title="Guest" subject="Rectangle" date="D:20210713134128-07'00'" width="9.437031125299281" creationdate="D:20210713134127-07'00'"/></annots><pages><defmtx matrix="1,0,0,-1,-309.27599999999995,1630.8" /></pages></xfdf>`
u.setFile(readStream)
.setXFDF(xfdf);
const response = await u.merge(); // merge XFDF
const mergedFile = await response.getBlob();
await response.deleteFile();
fs.writeFileSync('out.pdf', mergedFile)
})()
