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CodeClassify API — Barcode & Business Code Toolkit

Deterministic validation & conversion for the product and business codes you deal with every day: barcode check digits (GTIN / UPC / EAN / SSCC), ISBN conversion, IBAN, EU VAT, ISIN, VIN, ISO 6346 shipping containers, US ABA routing numbers, plus NAICS / SIC / HS code lookups and the SIC ↔ NAICS crosswalk. Same input, same output, every time — no AI guessing.

Links

🌐 Website + 16 free browser tools: https://code-classify.com
📖 API docs, endpoints & pricing: https://code-classify.com/api/

Getting started

Get a free API key at https://code-classify.com/api/
Set the collection variable api_key to your key (the X-Api-Key header is then sent automatically on every request).
Send any request in the folders below.

Most validation endpoints accept a single value or a batch of up to 100 per call. Every successful response is JSON with ok: true; batch endpoints also return count, valid (how many passed) and a per-item results array that echoes each input and, when a check digit is wrong, the expected digit and the corrected code.

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Validate the check digit of one or up to 100 barcodes (GTIN-8, UPC-A 12, EAN-13, GTIN-14). Send a single \"code\" or an array \"codes\". Each result echoes the input and, if the check digit is wrong, returns the expected digit and the corrected code. Free browser version: https://code-classify.com/gtin-check-digit/

Given a barcode WITHOUT its final check digit (7, 11, 12 or 13 digits), compute the missing check digit and return the complete code.

Convert between UPC-A (12) and EAN-13 (13) and build the GTIN-14 case/carton code with your chosen packaging indicator (1-8, default 1). The input's check digit is verified first. Free browser version: https://code-classify.com/upc-to-ean/

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Convert a book ISBN both ways. The check digit is recomputed and validated. 979-prefixed ISBN-13s have no ISBN-10 form (isbn10 is null). Free browser version: https://code-classify.com/isbn-converter/

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Validate one or up to 100 IBANs with the ISO 13616 MOD-97 checksum and per-country length rules. Send a single \"iban\" or an array \"ibans\". Checksum/structure only — not a registry or account-existence check. Free browser version: https://code-classify.com/iban-checker/

Validate the per-country format (and checksum where publicly defined) of one or up to 100 EU VAT numbers. Send \"vat\" or \"vats\". Format only — confirm a number is active via the official VIES service. Free browser version: https://code-classify.com/vat-number-validator/

Validate one or up to 100 numbers that use the Luhn (mod-10) algorithm — payment cards, IMEI, and more. Send \"number\" or \"numbers\". When a number fails, the expected check digit is returned. Free browser version: https://code-classify.com/luhn-checker/

Validate one or up to 100 securities identifiers with the ISO 6166 check digit (Luhn over the letter-expanded code). Send \"isin\" or \"isins\". Returns the 2-letter country/issuer prefix. Free browser version: https://code-classify.com/isin-validator/

Validate one or up to 100 US bank routing numbers with the ABA 3-7-1 checksum. Send \"number\" or \"numbers\". Checksum only — bank-name lookup is not provided. Free browser version: https://code-classify.com/routing-number-validator/

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Validate one or up to 100 SSCC-18 logistics serial shipping container codes with the GS1 mod-10 check digit. Send \"sscc\" or \"ssccs\". When wrong, the expected digit and corrected code are returned. Free browser version: https://code-classify.com/sscc-check-digit-calculator/

Validate one or up to 100 ISO 6346 intermodal container numbers. Send \"container\" or \"containers\". Each result breaks out the owner code, equipment category, serial number and check-digit result. Free browser version: https://code-classify.com/container-number-validator/

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Validate one or up to 100 Vehicle Identification Numbers. Send \"vin\" or \"vins\". The position-9 check digit is mandatory for North-American-market vehicles; genuine European VINs can still fail it, so the expected digit is always returned for reference. Free browser tool + NHTSA decode: https://code-classify.com/vin-validator/

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Search the official U.S. Census NAICS 2022 taxonomy by keywords or by a numeric code prefix. Returns matching codes at every hierarchy level (l = number of digits) ranked by relevance. Free browser version: https://code-classify.com/naics-lookup/

Search the legacy U.S. SIC 1987 code list by keywords or numeric prefix. Useful for older filings and datasets still keyed on SIC.

Map codes between systems using the official Census concordance. Provide either \"sic\" (SIC→NAICS) or \"naics\" (NAICS→SIC). Free browser version: https://code-classify.com/sic-to-naics/

Search Harmonized System customs headings (from the public-domain U.S. HTS) by product keywords or numeric prefix. Suggested classifications only — not customs advice; only an official ruling is binding. Free browser version: https://code-classify.com/hs-code-lookup/

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