I have created a new language "en-JP" and used the below entry in LanguageDefinitions.config file

<language id="en" region="JP" codepage="65001" encoding="utf-8" charset="iso-8859-1" icon="flags/16x16/flag_Japan.PNG" />

But when I switch an item language in Sitecore CMS, it is throwing the below error.

Error Screen

Could you please suggest to me how we can add this language and I wanted to show en-JP in my url and based on context language we're also pulling search results. Hence it is not recommended to use any alternate language code apart from "en-jp"

1 Answer 1


You need to register custom language in .NET and then try to define that in Sitecore.

Sample code:

string culture = "en-JP";
string name = "English (Japanese)";
//Create Culture & Region Info with an existing Language Culture (Eg: en-US)
CultureInfo cultureInfo = new CultureInfo("en-US");
RegionInfo regionInfo = new RegionInfo(cultureInfo.Name);
CultureAndRegionInfoBuilder cultureAndRegionInfoBuilder = new CultureAndRegionInfoBuilder(culture, CultureAndRegionModifiers.None);
cultureAndRegionInfoBuilder.CultureEnglishName = cultureAndRegionInfoBuilder.CultureNativeName = name;
//Register the Custom Language Culture

Check this blog that talks in detail about this - https://subbu.ca/blogs/adding-custom-language-in-sitecore/

There is a Sitecore SE post on this topic here that might be useful to you.

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