# Debug using fuse preview?

**URL:** <https://forums.fusetools.com/t/debug-using-fuse-preview/6802>\
**Category:** How-to Discussions\
**Created:** [February 5, 2016, 1:46pm UTC](https://forums.fusetools.com/t/debug-using-fuse-preview/6802 "2016-02-05T13:46:59Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![josh1](https://yyz1.discourse-cdn.com/flex035/user_avatar/forums.fusetools.com/josh1/32/567_2.png) [@josh1](https://forums.fusetools.com/u/josh1)\
**Post date:** [February 5, 2016, 1:46pm UTC](https://forums.fusetools.com/t/debug-using-fuse-preview/6802/1 "2016-02-05T13:46:59Z")

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Hello,

The fusetools documentation says:

"Targets that use the V8 JavaScript engine include Android, DotNet (including local preview) on both OS X and Windows, CMake on OS X, and MSVC on Windows.

Fuse uses the V8 JavaScript engine and its debugger protocol. Fuse applications that are built using the -DDEBUG\_V8 automatically listen for connections on a local socket, port 5858. While any debugger that uses the V8 debugger protocol should work in principle, we recommend using Visual Studio Code, which is available both for OS X and Windows."

How do you do this using the local preview? “fuse preview -DDEBUG\_V8” simply returns the error “Could not find a fuse project to preview”, which is nonsense as “fuse preview” in the same directory works.

Any help would be appreciated.

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**Author:** ![Anders\_Lassen](https://yyz1.discourse-cdn.com/flex035/user_avatar/forums.fusetools.com/anders_lassen/32/522_2.png) [@Anders\_Lassen](https://forums.fusetools.com/u/Anders_Lassen)\
**Post date:** [February 5, 2016, 3:09pm UTC](https://forums.fusetools.com/t/debug-using-fuse-preview/6802/2 "2016-02-05T15:09:23Z")

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Check out this video tutorial:

[https://www.youtube.com/watch?v=GloEpBr2lK0&list=PLdlqWm6b-XALJgM3fGa4q95Yipsgb8Q1o&index=22](https://www.youtube.com/watch?v=GloEpBr2lK0&list=PLdlqWm6b-XALJgM3fGa4q95Yipsgb8Q1o&index=22)

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**Author:** ![josh1](https://yyz1.discourse-cdn.com/flex035/user_avatar/forums.fusetools.com/josh1/32/567_2.png) [@josh1](https://forums.fusetools.com/u/josh1)\
**Post date:** [February 5, 2016, 3:24pm UTC](https://forums.fusetools.com/t/debug-using-fuse-preview/6802/3 "2016-02-05T15:24:36Z")

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Found the problem. The command is “fuse preview . -DDEBUG\_V8”

Thanks for the help

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**Author:** ![muaddib2004](https://avatars.discourse-cdn.com/v4/letter/m/e495f1/32.png) [@muaddib2004](https://forums.fusetools.com/u/muaddib2004)\
**Post date:** [March 19, 2023, 11:09am UTC](https://forums.fusetools.com/t/debug-using-fuse-preview/6802/4 "2023-03-19T11:09:59Z")

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Where have these videos moved to? (or updated version)

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**Author:** ![elinasadiq](https://yyz1.discourse-cdn.com/flex035/user_avatar/forums.fusetools.com/elinasadiq/32/1125_2.png) [@elinasadiq](https://forums.fusetools.com/u/elinasadiq)\
**Post date:** [July 13, 2024, 7:48am UTC](https://forums.fusetools.com/t/debug-using-fuse-preview/6802/5 "2024-07-13T07:48:04Z")

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Hello,  
Thanks for asking this.

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**Author:** ![caflischsivi](https://avatars.discourse-cdn.com/v4/letter/c/eada6e/32.png) [@caflischsivi](https://forums.fusetools.com/u/caflischsivi)\
**Post date:** [November 19, 2024, 10:30am UTC](https://forums.fusetools.com/t/debug-using-fuse-preview/6802/6 "2024-11-19T10:30:20Z")

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Thanks for the information