IBAN validation code examples, REST API integration guides, and open-source libraries for Python, JavaScript, PHP, Java, C#, Go, and Ruby.
Why OIDC cannot do npm's first publish, why Packagist needs no workflow, and the PyPI name check that returns 200 for names nobody owns.
Read article →A validator for the 28-character Northern Cyprus UBAN, plus a directory of all 23 registered banks. What UBAN ...
Read →A bare 400 with no error body, caused by a 20 May 2026 registry rule. The exact npm version boundary, the one ...
Read →I'm launching ibanchecker.cash on Product Hunt on August 31, 2026. Why I built a free, zero-log IBAN checker, ...
Read →Performance patterns for high-volume IBAN validation: local MOD-97 pre-filtering, micro-batching, two-layer ca...
Read →Event-driven IBAN validation: webhook receivers in Node.js, HMAC signature verification, idempotency, retry ba...
Read →Validate IBANs in Ruby with the ibanizator and banktools-eu gems, a pure-Ruby MOD-97 implementation, a Rails v...
Read →IBAN validation in Swift: a MOD-97 struct with chunked arithmetic, real-time UITextField feedback, async/await...
Read →Validate IBANs in JavaScript: call the API with fetch, implement MOD-97 with BigInt offline, wire up browser f...
Read →Convert a French RIB to a valid FR IBAN. Covers the clé RIB formula, MOD-97 check digits, Python and TypeScrip...
Read →Validate IBANs in Go: a zero-allocation MOD-97 implementation, the go-iban library, Gin middleware integration...
Read →Three production-ready Java approaches: the REST API, Apache Commons Validator, and iban4j, with Spring Boot i...
Read →Validate IBANs in C#: the IbanNet package, a zero-dependency MOD-97 method, ASP.NET Core annotations, and Flue...
Read →Three production-ready PHP approaches: a zero-dependency MOD-97 function, the globalcitizen/php-iban package, ...
Read →Country-specific regex patterns for DE, GB, FR, NL plus a generic IBAN regex, and why regex is only step 1 of ...
Read →Compare ibantools, python-stdnum, php-iban, and go-iban on features, MOD-97 support, and BIC lookup, plus when...
Read →Architect-level guide to IBAN API design: GET vs POST tradeoffs, error code standards, normalization, caching ...
Read →Two production-ready approaches: call the API for bank metadata, or implement MOD-97 yourself. Includes workin...
Read →Step-by-step guide to converting a Dutch rekeningnummer to a valid NL IBAN. Covers zero-padding, bank codes (A...
Read →Convert a Belgian 3-7-2 account number to a valid BE IBAN. Covers both check digit systems, the MOD-97 algorit...
Read →Build a valid TR IBAN from a Turkish bank code and account number. Covers the reserved digit, zero-padding, BD...
Read →Two approaches: call the ibanchecker.cash API for full bank data, or implement MOD-97 validation yourself. Inc...
Read →