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Slug Validator Field Guide: When Five Rules Decide the Permalink Shape
A valid URL slug isn't a guess. It's the lowest-common-denominator format every CMS, every CDN…
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Luhn Checksum Field Guide: When One mod-10 Walk Beats Eight Different Identifier Pipelines
A field guide to the four-step Luhn algorithm, the eight identifier families that depend on it, and the three failure modes that silently ship past unit tests.
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OCR PDF To Structured JSON Bridge Field Guide: When Text-Layer Geometry And Schema Validation Meet At The Field Boundary
A geometry-aware PDF text extractor that walks your JSON Schema field by field, coerces every value to the declared type, and validates the result with ajv before you paste it into your ERP or form.
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IBAN & SWIFT Code Validator Field Guide: When Two Bank Identifiers Share One Input Box But Use Different Checksums
The cross-border payment hits your invoice queue at 4:47 AM on a Tuesday. The customer swears the IBAN is correct, your bank says the SWIFT is misrouted, and your finance team is going to spend the...
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UUID Validator Field Guide: When a Well-Formed String Still Fails the Version and Variant Check
Most UUID bugs are well-formed strings carrying an unsupported version, non-conformant variant bits, or a sentinel value a regex waves through.
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ABA Routing Number Validator Field Guide: When MICR Modulus-10 and Federal Reserve Districts Decide What Nine Digits Mean
A nine-digit ABA routing number is not really nine digits. It is three pieces of…
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VIN Validator Field Guide: When Seventeen Characters Decide Whether Your Database Trusts the Vehicle
A VIN is not a serial number you read top-to-bottom. It is a 17-character contract…
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US Driver’s License Validator Field Guide: When State Grammars Do the Work That Regex Cannot
Every US state encodes its driver’s license differently. California uses one letter followed by seven…
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CUSIP Validator Field Guide: The Mod-10 Check That Quietly Catches Bad Securities IDs
Every North American stock, bond, and ETF ticker rides on a nine-character code, and the…
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Molar Mass Lookup Field Guide: Atomic Weights That Survive a Lab Bench Audit
Molar mass is just a number — until you ask where it came from. A…