# Source for the 5-character hash in $HOME/.julia/packages/\<pkgname\>/

**URL:** <https://discourse.julialang.org/t/source-for-the-5-character-hash-in-home-julia-packages-pkgname/92793>\
**Category:** General Usage\
**Created:** [January 11, 2023, 5:46am UTC](https://discourse.julialang.org/t/source-for-the-5-character-hash-in-home-julia-packages-pkgname/92793 "2023-01-11T05:46:41Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![harris-chris](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/harris-chris/32/23877_2.png) [@harris-chris](https://discourse.julialang.org/u/harris-chris)\
**Post date:** [January 11, 2023, 5:46am UTC](https://discourse.julialang.org/t/source-for-the-5-character-hash-in-home-julia-packages-pkgname/92793/1 "2023-01-11T05:46:41Z")

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Hello all,

I notice that each package in my `$HOME/.julia/packages/<pkgname>/` folder has what looks like a 5-character hash code - for example, `$HOME/.julia/packages/HTTP/aTjcj`. Can anyone tell me how this hash is derived, or where it can be read from?

Thanks!

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**Author:** ![skleinbo](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/skleinbo/32/36080_2.png) [@skleinbo](https://discourse.julialang.org/u/skleinbo)\
**Post date:** [January 11, 2023, 7:06am UTC](https://discourse.julialang.org/t/source-for-the-5-character-hash-in-home-julia-packages-pkgname/92793/2 "2023-01-11T07:06:38Z")

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It’s derived from the package UUID and the tree hash as recorded in the manifest.

Start at

> <https://github.com/JuliaLang/julia/blob/8985403c0090b0f41bb0c4165ba1666e3611151e/base/loading.jl#L419:420>

and you will eventually land on

> <https://github.com/JuliaLang/julia/blob/8985403c0090b0f41bb0c4165ba1666e3611151e/base/loading.jl#L202>

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<div class="post-metadata">

**Author:** ![harris-chris](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/harris-chris/32/23877_2.png) [@harris-chris](https://discourse.julialang.org/u/harris-chris)\
**Post date:** [January 11, 2023, 8:08am UTC](https://discourse.julialang.org/t/source-for-the-5-character-hash-in-home-julia-packages-pkgname/92793/3 "2023-01-11T08:08:05Z")

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Thank you! That’s exactly what I needed to know.