# Migrating back and forth from PDF.JS Express to PDFTron WebViewer

**URL:** <https://pdfjs.community/t/migrating-back-and-forth-from-pdf-js-express-to-pdftron-webviewer/1344>\
**Category:** FAQ\
**Created:** [February 1, 2022, 3:36pm UTC](https://pdfjs.community/t/migrating-back-and-forth-from-pdf-js-express-to-pdftron-webviewer/1344 "2022-02-01T15:36:45Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![inincic](https://yyz1.discourse-cdn.com/flex031/user_avatar/pdfjs.community/inincic/32/227_2.png) [@inincic](https://pdfjs.community/u/inincic)\
**Post date:** [February 1, 2022, 3:36pm UTC](https://pdfjs.community/t/migrating-back-and-forth-from-pdf-js-express-to-pdftron-webviewer/1344/1 "2022-02-01T15:36:45Z")

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Migrating back and forth PDF.JS Express to PDFTron WebViewer is very simple (the core API is the exact same) as long as you restrict the app to a subset of functionality supported by Express.

For details, please see: https://pdfjs.express/documentation/learn-more/pdfjs-express-to-pdftron