app.js

import React, { Component } from 'react';
import React from 'react';
import Docxtemplater from 'docxtemplater';
import PizZip from 'pizzip';
import PizZipUtils from 'pizzip/utils/index.js';
import { saveAs } from 'file-saver';
import DocViewer, { DocViewerRenderers } from 'react-doc-viewer';

function loadFile(url, callback) {
  PizZipUtils.getBinaryContent(url, callback);
}

export const App = class App extends React.Component {
  render() {
    const docs = [
      { uri: 'https://docxtemplater.com/tag-example.docx' },
      { uri: 'https://docxtemplater.com/tag-example.docx' },
    ];
    const generateDocument = () => {
      loadFile(
        'https://docxtemplater.com/tag-example.docx',
        function (error, content) {
          if (error) {
            throw error;
          }
          var zip = new PizZip(content);
          var doc = new Docxtemplater(zip, {
            paragraphLoop: true,
            linebreaks: true,
          });
          doc.setData({
            first_name: 'John',
            last_name: 'Doe',
            phone: '0652455478',
            description: 'New Website',
          });
          try {
            // render the document (replace all occurences of {first_name} by John, {last_name} by Doe, ...)
            doc.render();
          } catch (error) {
            // The error thrown here contains additional information when logged with JSON.stringify (it contains a properties object containing all suberrors).
            function replaceErrors(key, value) {
              if (value instanceof Error) {
                return Object.getOwnPropertyNames(value).reduce(function (
                  error,
                  key
                ) {
                  error[key] = value[key];
                  return error;
                },
                {});
              }
              return value;
            }
            console.log(JSON.stringify({ error: error }, replaceErrors));

            if (error.properties && error.properties.errors instanceof Array) {
              const errorMessages = error.properties.errors
                .map(function (error) {
                  return error.properties.explanation;
                })
                .join('\n');
              console.log('errorMessages', errorMessages);
              // errorMessages is a humanly readable message looking like this :
              // 'The tag beginning with "foobar" is unopened'
            }
            throw error;
          }
          var out = doc.getZip().generate({
            type: 'blob',
            mimeType:
              'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
          }); //Output the document using Data-URI
          saveAs(out, 'output.docx');
        }
      );
    };

    return (
      <div className="p-2">
        <DocViewer pluginRenderers={DocViewerRenderers} documents={docs} />
        <button onClick={generateDocument}>Generate document</button>
      </div>
    );
  }
};