ally-bcp-47BCP-47 Language Tag Validation

A comprehensive TypeScript library for validating, parsing, and canonicalizing BCP-47 language tags

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Complete Validation

Fully validates language tags against the RFC 5646 specification including syntax and registry validation

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Accessibility Ready

Ensures compliance with ADA, Section 508, and European Accessibility Act requirements

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Lightweight & Fast

Fully tree-shakable with minimal footprint (1KB for single function imports). Optimized for performance with zero dependencies.

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TypeScript Support

First-class TypeScript support with complete type definitions

Build Your Language Tag

Search for your language and country to build a correct BCP-47 language tag

Language

Bulgarian

Catalan

Czech

Danish

German

Greek

English

Spanish

Estonian

Basque

Finnish

French

Irish

Galician

Croatian

Hungarian

Italian

Luxembourgish

Lithuanian

Latvian

Maltese

Dutch

Norwegian

Polish

Portuguese

Romanian

Slovak

Slovenian

Swedish

Turkish

Country

Austria

Belgium

Bulgaria

Croatia

Cyprus

Czech Republic

Denmark

Estonia

Finland

France

Germany

Greece

Hungary

Ireland

Italy

Latvia

Lithuania

Luxembourg

Malta

Netherlands

Poland

Portugal

Romania

Slovakia

Slovenia

Spain

Sweden

United Kingdom

Switzerland

Norway

Select language and country

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