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Rotating a PDF page in Node.js

To rotate a page in a PDF document.

const doc = await PDFNet.PDFDoc.createFromURL(filename);

// Rotate the first page 90 degrees clockwise.
const page = await doc.getPage(1);
const originalRotation = await page.getRotation();
var rotation;
switch (originalRotation)
{
  case Page.e_0:   rotation = Page.e_90;  break;
  case Page.e_90:  rotation = Page.e_180; break;
  case Page.e_180: rotation = Page.e_270; break;
  case Page.e_270: rotation = Page.e_0;   break;
  default:         rotation = Page.e_0;   break;
}
page.setRotation(rotation);

linkAbout rotating pages

A page can be rotated clockwise, by 90 degrees, when displayed or printed. The Page.GetRotation() method returns the Page.Rotate enum specifying the current rotation. Similarly, Page.SetRotation() sets the current rotation.

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