Puppeteer: page.pdf() Cannot handle parameter type:

PDF dimension input is neither a supported number nor a string.

Error message

page.pdf() Cannot handle parameter type:

How this error happens

A PDF width or height must be a number or string. Passing an object from a form or configuration parser is not supported.

The snippets use an open Puppeteer page named page.

await page.pdf({
    width: {
        value: 210,
        unit: "mm",
    },
});

How to fix

Convert structured configuration into the string or number the PDF API expects.

const paperWidth = {
    value: 210,
    unit: "mm",
};

await page.pdf({
    width: paperWidth.value + paperWidth.unit,
    height: "297mm",
});

Things to keep in mind

Numeric dimensions are interpreted as pixels. Add an explicit unit if your configuration uses millimeters or inches.

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