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Flutter ARB — English

A Flutter Application Resource Bundle (English) — JSON messages with matching @key metadata (descriptions and typed placeholders) using ICU {name} syntax, as Flutter's gen-l10n consumes.

Localization catalogs Internationalization Editor testing

Preview — first 38 linesarb

{
  "@@locale": "en",
  "greeting": "Hello",
  "@greeting": {
    "description": "Greeting shown on the home screen"
  },
  "welcome": "Welcome, {name}",
  "@welcome": {
    "description": "Welcome message with the user's name",
    "placeholders": {
      "name": {
        "type": "String",
        "example": "Sam"
      }
    }
  },
  "save": "Save",
  "@save": {
    "description": "Save button label"
  },
  "cancel": "Cancel",
  "@cancel": {
    "description": "Cancel button label"
  },
  "search": "Search",
  "@search": {
    "description": "Search field placeholder"
  },
  "settings": "Settings",
  "@settings": {
    "description": "Settings menu item"
  },
  "logout": "Log out",
  "@logout": {
    "description": "Log out menu item"
  }
}

Specifications

Format: Flutter ARB (JSON)
Locale: en
Placeholders: ICU {name}
Metadata: @key blocks

What is a .arb file?

An ARB file (.arb, Application Resource Bundle) is a JSON-based localization format used by Flutter and Google tools. Alongside each key's translated string it stores metadata in a matching @key object — a description and typed placeholders — and uses ICU message syntax with {name} placeholders and plural/select rules.

How to use this file

Use an example .arb file to test Flutter's gen-l10n pipeline, ARB editors and converters, and ICU message-syntax parsers, or to exercise placeholder and plural handling.

How to use this file for testing

“Flutter ARB — English” is a deterministic Novus Examples fixture for Localization catalogs, Internationalization, Editor testing. Gettext PO/POT, XLIFF, Apple .strings, Flutter .arb, Android strings.xml, .NET .resx, and i18next JSON — with RTL and CJK variants — for testing localization pipelines, translation-memory tools, and catalog converters.

Documented properties for this file: Flutter ARB (JSON). Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.

Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such — expect parsers to fail loudly rather than silently accept them.

Translation-catalog fixtures carry the same message set across formats, each with its native placeholder syntax. Test your i18n loader, catalog converter, or translation-memory tool, and use the RTL and CJK variants to check bidirectional text and Unicode handling.

Load the catalog with your i18n framework and verify placeholder interpolation and plural handling; the RTL and CJK variants exercise bidirectional text and font fallback.

Code examples

import json

data = json.load(open("app_en.arb", encoding="utf-8"))
msgs = {k: v for k, v in data.items() if not k.startswith("@")}
print(len(msgs), "messages")

Generated by generation/localization.py. Free for any use, no attribution required — license.

Specifications

What is a .arb file?

How to use this file

How to use this file for testing

Code examples

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