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ICU Message Catalog Auditor

Parse bounded ICU message catalogs and compare named arguments without evaluating translations.

✓ Browser-local processing
Processed in this tab. Up to 100,000 characters unless this tool states a smaller limit.

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How to use ICU Message Catalog Auditor

Find invalid messages, missing entries and changed argument signatures across two flat JSON catalogs. Plural/select branches remain parsed data; no functions or translation services run.

  1. Enter input, comparison catalog (blank for syntax only).
  2. Choose the settings for icu message catalog auditor, then run the tool.
  3. Review the result and any limitations before copying or downloading it.

Good to know

  • 50,000 combined characters across the flat catalogs,500 messages,10,000 characters per message and conservative raw brace/AST nesting20. Total AST budget10,000 nodes.
  • Uses a pinned FormatJS parser, not an ICU evaluator. Literal quoted braces count toward the conservative preparse nesting bound. Syntax failure is reported per message.
  • Processing is local. Output is limited to 1,000,000 text characters unless a stricter file limit is stated.

Common questions

Are plural expressions executed?

No. Parsed branch structure and argument names are inspected without formatting any message or invoking callbacks.

Is this input sent to a server?

No. The application processes this input inside your browser tab and does not save it to persistent storage.

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