# why after input .vtu file to vtureader inside of itk.js, then the vtkread inside of vtureader does not output any thing from my case

**URL:** https://discourse.vtk.org/t/why-after-input-vtu-file-to-vtureader-inside-of-itk-js-then-the-vtkread-inside-of-vtureader-does-not-output-any-thing-from-my-case/9815
**Category:** Web
**Tags:** code
**Created:** [November 14, 2022, 10:13am UTC](https://discourse.vtk.org/t/why-after-input-vtu-file-to-vtureader-inside-of-itk-js-then-the-vtkread-inside-of-vtureader-does-not-output-any-thing-from-my-case/9815 "2022-11-14T10:13:55Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![peng\_peter](https://discourse.vtk.org/user_avatar/discourse.vtk.org/peng_peter/32/6029_2.png) [@peng\_peter](https://discourse.vtk.org/u/peng_peter)
#### Post date: [November 14, 2022, 10:13am UTC](https://discourse.vtk.org/t/why-after-input-vtu-file-to-vtureader-inside-of-itk-js-then-the-vtkread-inside-of-vtureader-does-not-output-any-thing-from-my-case/9815/1 "2022-11-14T10:13:55Z")

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I use vue3+vite+typescript+@kitware/vtk.js+itk.js , then I input a .vtu file to vtu reader， I can see the vtu file that I input from rawDataBuffer, but the output is null, anyone can give me any help. thank you so much

 ![image](https://discourse.vtk.org/uploads/default/original/2X/d/da7f65f4783435fc7eca5e2e9181308cd8a57b29.jpeg)

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### Author: ![Forrest](https://discourse.vtk.org/user_avatar/discourse.vtk.org/forrest/32/300_2.png) [@Forrest](https://discourse.vtk.org/u/Forrest)
#### Post date: [November 15, 2022, 3:42pm UTC](https://discourse.vtk.org/t/why-after-input-vtu-file-to-vtureader-inside-of-itk-js-then-the-vtkread-inside-of-vtureader-does-not-output-any-thing-from-my-case/9815/2 "2022-11-15T15:42:39Z")

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`itkPolyDataReader.parseAsArrayBuffer` returns a promise. Are you awaiting this promise before getting the output?