# Old data to be extract from XFDF file and to store in firebase | Real Time Collaboration

**URL:** <https://pdfjs.community/t/old-data-to-be-extract-from-xfdf-file-and-to-store-in-firebase-real-time-collaboration/1184>\
**Category:** Technical Support\
**Created:** [November 17, 2021, 5:20pm UTC](https://pdfjs.community/t/old-data-to-be-extract-from-xfdf-file-and-to-store-in-firebase-real-time-collaboration/1184 "2021-11-17T17:20:23Z")\
**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 17, 2021, 5:20pm UTC](https://pdfjs.community/t/old-data-to-be-extract-from-xfdf-file-and-to-store-in-firebase-real-time-collaboration/1184/3 "2021-11-17T17:20:29Z")

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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:
- [Best practices for PDF.js Express - Store annotations](https://pdfjs.express/documentation/learn-more/best-practices#store-annotations)
- [XFDF format - In PDF.js Express Web Viewer](https://pdfjs.express/documentation/annotation/xfdf#in-pdf.js-express-web-viewer)
- [API for Real-time Collaboration With PDF.js Express](https://pdfjs.express/documentation/collaboration/api)

APIs:
- [PDF.js Express Utilities](https://pdfjs.express/api/utils/index.html#__anchor)
- [Core.DocumentViewer - setDocumentXFDFRetriever(retriever)](https://pdfjs.express/api/Core.DocumentViewer.html#setDocumentXFDFRetriever__anchor)
- [Core.Annotations.RedactionAnnotation - new RedactionAnnotation( [options])](https://pdfjs.express/api/Core.Annotations.RedactionAnnotation.html#RedactionAnnotation__anchor)

Forums:
- [Store annotation data from xfdf file to real time collaboration](https://pdfjs.community/t/store-annotation-data-from-xfdf-file-to-real-time-collaboration/1181/1)
- [Extracting and annotations](https://pdfjs.community/t/extracting-and-annotations/297/1)
- [Failed xfdf downloading](https://pdfjs.community/t/failed-xfdf-downloading/1174/1)

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