See the docs for more details including the specification for ARB design, or the schema for validation.

Application Resource Bundle (abbreviated ARB) is a localization resource format that is

• simple - based on JSON,
• extensible - vocabulary can be added without affecting existing tools and usage,
• directly usable - applications can access the resource directly from this format without converting to another form.

In ARB, localizable resources are encoded as a JSON object. Each resource will have a resource entry identified by resource key, and an optional resource attribute entry with resource attribute key.

Example: