LEI Validation in JavaScript — GLEIF Lookup Without Rate Limits

📰 Dev.to · Leszek Czajka

Validate Legal Entity Identifiers (LEIs) in JavaScript using GLEIF lookup without rate limits to ensure accurate entity data

intermediate Published 5 Mar 2026
Action Steps
  1. Use the GLEIF database API to fetch LEI records
  2. Validate LEIs using a mod-97 check and additional verification steps
  3. Enrich LEI data with entity information from the GLEIF database
  4. Implement a caching mechanism to avoid rate limits on the GLEIF API
  5. Test the LEI validation function with sample data to ensure accuracy
Who Needs to Know This

Developers and data analysts working with financial or regulatory data can benefit from this technique to validate and enrich LEI data

Key Insight

💡 Mod-97 alone is not enough for LEI validation, and using a GLEIF database lookup can provide more accurate and comprehensive results

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🚀 Validate LEIs in JavaScript without rate limits using GLEIF lookup! 📈

Key Takeaways

Validate Legal Entity Identifiers (LEIs) in JavaScript using GLEIF lookup without rate limits to ensure accurate entity data

Full Article

How to validate Legal Entity Identifiers, why mod-97 alone isn't enough, and how to enrich LEIs with entity data from a 2.3M record GLEIF database.
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