read-excel-file/modules/unpackXlsxFileNode.js

Read `*.xlsx` files in a browser or Node.js. Parse to JSON with a strict schema.

import fs from 'fs';
import Stream from 'stream';
import unzip from 'unzipper';

/**
 * Reads XLSX file in Node.js.
 * @param  {(string|Stream)} input - A Node.js readable stream or a path to a file.
 * @return {Promise} Resolves to an object holding XLSX file entries.
 */
export default function unpackXlsxFile(input) {
  // XLSX file is a zip archive.
  // The `entries` object stores the files
  // and their contents from this XLSX zip archive.
  var entries = {};

  var stream = input instanceof Stream ? input : fs.createReadStream(input);

  return new Promise(function (resolve, reject) {
    var entryPromises = [];

    stream
    // This first "error" listener is for the original stream errors.
    .on('error', reject).pipe(unzip.Parse())
    // This second "error" listener is for the unzip stream errors.
    .on('error', reject).on('close', function () {
      return Promise.all(entryPromises).then(function () {
        return resolve(entries);
      });
    }).on('entry', function (entry) {
      var contents = '';
      // To ignore an entry: `entry.autodrain()`.
      entryPromises.push(new Promise(function (resolve) {
        entry.on('data', function (data) {
          return contents += data.toString();
        }).on('end', function () {
          return resolve(entries[entry.path] = contents);
        });
      }));
    });
  });
}
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