节点js应用程序中的pdf2json解析错误

Question

我无法使用 pdf2json 将 pdf 转换为 json 格式。我想通过nodejs使用pdf2json库将pdf文件转换为json格式。但是，我为json指定的目录中没有json文件，我放一个空的json文件时它并没有过期。当我在调试模式下运行我的代码时，它会输出以下日志。我该怎么做才能保存为json？我遵循这些步骤； https://github.com/modesty/pdf2json控制台日志消息/Desktop/nodejs-pdf-parse/app.jsDebugger listening on ws://127.0.0.1:45843/bb0e57e8-b28d-4652-81f8-2cba00f4372bFor help, see: https://nodejs.org/en/docs/inspectorDebugger attached.Waiting for the debugger to disconnect...Process finished with exit code 130 (interrupted by signal 2: SIGINT)节点let fs = require('fs'), PDFParser = require("pdf2json");let pdfParser = new PDFParser(this, 1);try {    pdfParser.loadPDF("/Desktop/nodejs-pdf-parse/pdf/Paycheck-Protection.pdf");}catch (e) {    console.log(e)}pdfParser.on("pdfParser_dataError", errData => console.error(errData.parserError) );pdfParser.on("pdfParser_dataReady", pdfData => {    fs.writeFile("/Desktop/nodejs-pdf-parse/parsed-json/parsed.json", JSON.stringify(pdfData));});运行：节点 app.jsfs.js:148  throw new ERR_INVALID_CALLBACK(cb);  ^TypeError [ERR_INVALID_CALLBACK]: Callback must be a function. Received undefined    at maybeCallback (fs.js:148:9)    at Object.writeFile (fs.js:1298:14)    at PdfParser.<anonymous> (/home/mutlueren/Desktop/nodejs-pdf-parse/app.js:7:8)    at PdfParser.emit (events.js:315:20)    at PdfParser._onPDFJSParseDataReady (/home/mutlueren/Desktop/nodejs-pdf-parse/node_modules/pdf2json/pdfparser.js:25:9)    at cls.emit (events.js:315:20)    at /home/mutlueren/Desktop/nodejs-pdf-parse/node_modules/pdf2json/lib/pdf.js:250:38    at processTicksAndRejections (internal/process/task_queues.js:79:11) {  code: 'ERR_INVALID_CALLBACK'}

Answer 1

const pdfParser = new PDFParser();

  pdfParser.on("pdfParser_dataError", (errData) =>

    console.error(errData.parserError)

  );

  pdfParser.on("pdfParser_dataReady", (pdfData) => {

    fs.writeFile(

      "/Desktop/nodejs-pdf-parse/parsed-json/parsed.json",

      JSON.stringify(pdfData),

      function (err, result) {

        console.log(err);

      }

    );

  });

  pdfParser.loadPDF("/Desktop/nodejs-pdf-parse/pdf/Paycheck-Protection.pdf");