# Access to PDF.js viewer when your servers are unavailable

**URL:** <https://pdfjs.community/t/access-to-pdf-js-viewer-when-your-servers-are-unavailable/1260>\
**Category:** Technical Support\
**Created:** [December 20, 2021, 8:41am UTC](https://pdfjs.community/t/access-to-pdf-js-viewer-when-your-servers-are-unavailable/1260 "2021-12-20T08:41:06Z")\
**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:** [December 20, 2021, 8:41am UTC](https://pdfjs.community/t/access-to-pdf-js-viewer-when-your-servers-are-unavailable/1260/3 "2021-12-20T08:41:11Z")

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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:
- [Integrating PDF.js Express Plus into a new Blazor project - Prerequisites](https://pdfjs.express/documentation/get-started/blazor/new-project#prerequisites)
- [Set up real-time collaboration](https://pdfjs.express/documentation/collaboration/setup)
- [PDF.js Express Viewer APIs](https://pdfjs.express/documentation/viewer/api)

APIs:
- [PDF.js Express Utilities](https://pdfjs.express/api/utils/index.html#__anchor)
- [ExpressUtils(optionsopt) - # async merge() → {Promise.}](https://pdfjs.express/api/utils/ExpressUtils.html#merge__anchor)
- [Adding a download button](https://pdfjs.express/api/utils/tutorial-Adding%20a%20download%20button.html#__anchor)

Forums:
- [How to move rubber stamp out of mis tool and remove another group annotation](https://pdfjs.community/t/how-to-move-rubber-stamp-out-of-mis-tool-and-remove-another-group-annotation/844/1)
- [How can we create our custom thumbnail panel beside our viewer?](https://pdfjs.community/t/how-can-we-create-our-custom-thumbnail-panel-beside-our-viewer/811/1)
- [Undefined is not a valid destination type](https://pdfjs.community/t/undefined-is-not-a-valid-destination-type/809/1)

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