How Do I use a node.js module with Next.js?

Do I need to use express with next.js?

Im trying to add this code into a next.js application. ( from npm module example code: pdf2json )

let fs = require('fs');
var PDFParser = require("pdf2json");
let pdfParser = new PDFParser(this,1);

pdfParser.on("pdfParser_dataError", errData => 
   console.error(errData.parserError) );
pdfParser.on("pdfParser_dataReady", pdfData => {
fs.writeFile("./sometxt.txt", pdfParser.getRawTextContent());
pdfParser.loadPDF("./page1.pdf");