language-subtag-registry
BCP 47 language subtag data in JSON format with multiple indices.
Pricing
Free tier
Flat rate
Adoption
↘CoolingLicense
Open Source
Data freshness
Aging · Jun 8, 2026Overview
What is language-subtag-registry?
Provides full BCP 47 language subtag data from the official IANA repository, formatted as JSON with multiple indices for easy access and integration into various applications. This tool is crucial for developers needing accurate and up-to-date language tagging information.
Key differentiator
“language-subtag-registry offers a comprehensive, regularly updated JSON dataset of BCP 47 language subtags from IANA, making it an essential tool for developers needing accurate language tagging data.”
Capability profile
Capability Radar
Honest assessment
Strengths & Weaknesses
↑ Strengths
↓ Weaknesses
Primary language is JavaScript, with limited official support for other languages
Requires manual configuration and dependency management to ensure compatibility with project requirements
Processing extensive language subtag data can lead to performance degradation, especially in real-time applications
Limited contributions from the open-source community and a small number of available plugins or extensions for other tools
Fit analysis
Who is it for?
✓ Best for
Projects needing precise BCP 47 language subtag data for integration
Developers working on applications with strong internationalization requirements
✕ Not a fit for
Applications that do not require detailed language tagging information
Scenarios where real-time updates to the registry are critical and cannot be handled through periodic refreshes
Cost structure
Pricing
Free Tier
Available
Open source — free to use
Starts at
$0
Model
Flat rate
Enterprise
None
Performance benchmarks
How Fast Is It?
Ecosystem
Relationships
Integrations
Next step
Get Started with language-subtag-registry
Step-by-step setup guide with code examples and common gotchas.