test.js

const { PdfReader } = require('pdfreader');

const reader = new PdfReader();

const makeLines = (rows) => {
  Object.keys(rows)
    .sort((y1, y2) => parseFloat(y1) - parseFloat(y2))
    .forEach(y => text += `${(rows[y] || []).join('')}\n`);
};

const readFromPdf = () => new Promise((resolve, reject) => {
  let text = '';
  reader.parseFileItems('test.pdf', (err, item) => {
    if (item !== undefined) {
      if (item.page) {
        text += '\n';
      } else {
        text += item.text;
      }
    }
    if (err) throw reject(err);
  });
  resolve(text);
});

readFromPdf().then((text) => console.log(text));