# Cannot view existing annotation on pdf in PDF.js Express Viewer

**URL:** <https://pdfjs.community/t/cannot-view-existing-annotation-on-pdf-in-pdf-js-express-viewer/1160>\
**Category:** Technical Support\
**Created:** [November 5, 2021, 10:20pm UTC](https://pdfjs.community/t/cannot-view-existing-annotation-on-pdf-in-pdf-js-express-viewer/1160 "2021-11-05T22:20:07Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![system](https://canada1.discourse-cdn.com/flex031/uploads/pdfjscommunity/original/1X/ffbcd25c7d423db8d5acd5db201c272f4db306dd.png) [@system](https://pdfjs.community/u/system)\
**Post date:** [November 5, 2021, 10:20pm UTC](https://pdfjs.community/t/cannot-view-existing-annotation-on-pdf-in-pdf-js-express-viewer/1160/3 "2021-11-05T22:20:12Z")

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**Hello, I’m Ron, an automated tech support bot 🤖**

While you wait for one of our customer support representatives to get back to you, please check out some of these documentation pages:

Guides:
- [Merge & extract annotation in PDF.js Express](https://pdfjs.express/documentation/annotation/merge-and-extract)
- [PDF.js Express annotations](https://pdfjs.express/documentation/annotation/overview)
- [Understand coordinates in PDF.js Express - Viewer page coordinates](https://pdfjs.express/documentation/viewer/coordinates.8#viewer-page-coordinates)

APIs:
- [PDF.js Express Utilities](https://pdfjs.express/api/utils/index.html#__anchor)
- [ExpressUtils(optionsopt) - # async set() → {Promise.}](https://pdfjs.express/api/utils/ExpressUtils.html#set__anchor)
- [Core.DocumentViewer - refreshAll()](https://pdfjs.express/api/Core.DocumentViewer.html#refreshAll__anchor)

Forums:
- [Cannot view existing annotation on pdf](https://pdfjs.community/t/cannot-view-existing-annotation-on-pdf/1159/1)
- [Handeling test selection programatically (caret manipulation)](https://pdfjs.community/t/handeling-test-selection-programatically-caret-manipulation/408/1)
- [Server side annotation merging](https://pdfjs.community/t/server-side-annotation-merging/167/1)

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