Is there a way to write metadata to the docx file in Node.js?

A Docx file comprises of a collection of XML files that are contained inside a ZIP archive. The contents of a new Word document can be viewed by unzipping its contents.

So, to edit write docx file's metadata is to

1. Unzip the docx file.

you can use unzipper npm to unzip docx file.

  fs.createReadStream('path/to/archive.zip')
    .pipe(unzipper.Extract({ path: 'output/path' }));

2. Once unzip the docx file, you can see app.xml and core.xml files in docProps directory, and update this as you require for the metadata of the docx file.

3. Zip the entire folder. It's important that the files that make up the docx are not within another folder, i.e. [Content_Types].xml must be in the root of the resulting zipped file. When you open (or extract to the current directory) the zip file, you should have something similar to the following:

./docProps/
./word/
./_rels/
./customXml/
./[Content_Types].xml