Formatting lost after base64 conversion

[ajRED777]

The screenshot below shows 2 documents-My Document(37), and My Document(38).
38 was generated using the Express demo app hosted by dolanmiu- https://runkit.com/dolanmiu/docx-demo4
37 was generated using a sam app with lambda and API gateway locally.
Doc 37 has lost the table formatting but 38 has retained it.

Code used to generate 37 is as follows:

const { Document, Packer, Paragraph, Table, TableCell, TableRow } = docx;
const correlationId = context.awsRequestId;

const table = new Table({
    rows: [
        new TableRow({
            children: [
                new TableCell({
                    children: [new Paragraph("Hello")],
                }),
                new TableCell({
                    children: [],
                }),
            ],
        }),
        new TableRow({
            children: [
                new TableCell({
                    children: [],
                }),
                new TableCell({
                    children: [new Paragraph("World")],
                }),
            ],
        }),
    ],
});

const doc = new Document({
    sections: [{
        children: [table],
    }],
});

const b64string = await Packer.toBase64String(doc);

return {
    headers: { 'Content-Type': 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
                'Content-Disposition': 'attachment; filename=My Document.docx'},
    statusCode: 200,
    body: b64string,
    isBase64Encoded: true
}

The template building is basically the same as the demo app-https://runkit.com/dolanmiu/docx-demo4
The only difference is the base64 generation, which is as follows(present in the above code but just putting to show specific change from demo code)

Also tried decoding the base64 string using https://base64.guru/converter/decode/file and got the doc with a broken format similar to 37. (Did this to verify if the AWS API gateway is changing something)

Tried Buffer object also but yielded the same results.

Hoping someone could help in identifying why the doc does not retain the formatting.

[ajRED777]

Apparently, it is not the base 64 conversion that is the issue. It is actually the version of the library that was different- I am using 7.4.1 but the demo is using 6.0.1 where something has changed with the margins of a doc.

Just putting here for reference:
If you are developing this using a SAM app with API gateway then you should specify in your response the 'Content-Type' and also the flag 'isBase64Encoded' with 'BinaryMediaType' property for API gateway in yml file as follows:

This will ensure the base64 is converted by the API gateway to a binary format and also not garble it into a different binary.

@dolanmiu are there any ways to get the same result in the newer versions i.e. getting margins in the document like in 6.0.1?

[dolanmiu]

Could you try explicitly adding margins to the page like so:

https://github.com/dolanmiu/docx/blob/master/demo/6-page-borders.ts