# How to paste mat ROI using javascript

**URL:** <https://forum.opencv.org/t/how-to-paste-mat-roi-using-javascript/17307>\
**Category:** Android/Java\
**Created:** [April 16, 2024, 12:33am UTC](https://forum.opencv.org/t/how-to-paste-mat-roi-using-javascript/17307 "2024-04-16T00:33:07Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Birkin](https://avatars.discourse-cdn.com/v4/letter/b/ee59a6/32.png) [@Birkin](https://forum.opencv.org/u/Birkin)\
**Post date:** [April 16, 2024, 12:33am UTC](https://forum.opencv.org/t/how-to-paste-mat-roi-using-javascript/17307/1 "2024-04-16T00:33:07Z")

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In C or C#  
Mat [RectROI] = newMat; If you add it like so:  
newMat is reflected in Mat’s RectROI.  
Is there a way to make it work like above in javascript?