# How to test if package is installed

**URL:** <https://discourse.julialang.org/t/how-to-test-if-package-is-installed/3508>\
**Category:** General Usage\
**Tags:** question\
**Created:** [May 4, 2017, 6:18am UTC](https://discourse.julialang.org/t/how-to-test-if-package-is-installed/3508 "2017-05-04T06:18:47Z")\
**Posts on this page:** 1\
**Showing post:** 14

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**Author:** ![00vareladavid](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/00vareladavid/32/23521_2.png) [@00vareladavid](https://discourse.julialang.org/u/00vareladavid)\
**Post date:** [November 9, 2018, 4:02am UTC](https://discourse.julialang.org/t/how-to-test-if-package-is-installed/3508/14 "2018-11-09T04:02:30Z")

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`Pkg.installed()` returns a `Dict`, it does not take arguments. So if you want to check for a specific package, use `haskey`. For example: `haskey(Pkg.installed(), "Colors")`

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