What is an ARB file? An ARB file is an application resource bundle used by an Android app created using Dart or Flutter. It contains localization strings used to show the app's text in a user's language. Developers eventually convert ARB files into corresponding .DART files, which store the localization strings as part of Dart source code.

More Information ARB file open in Microsoft Visual Studio Code Using Dart or Flutter, Android app developers can generate a template ARB file for their application. This template file contains a single JSON table, which lists all the app's strings in the app's default language. Developers can then copy this table into another file, replace the default strings with internationalized versions of their strings, and save the resulting ARB file(s) to create a translation file(s) for their application. After creating all the translation files their app needs, developers can convert their ARB files into DART files and import them into their app, for use in localization-related code.