Results for “validation”

Check a 17-character vehicle identification number and its check digit; enforced for North American VINs.

Check an HMRC Unique Taxpayer Reference's modulus 11 check digit, accepting the K and spacing people type.

Is this a plausible email address? A documented, pragmatic subset of RFC 5322, not the full grammar.

Check a 20-character Legal Entity Identifier against its ISO 17442 / ISO 7064 MOD 97-10 check digits.

Check an IBAN against the ISO 13616 mod-97-10 checksum and the registered length for its country.

Check a digit string against the Luhn mod-10 checksum used by payment cards and many identifiers.

Check a UK National Insurance number's format and HMRC's disallowed prefix letters, and normalise it.

Validate a UK postcode and normalise it to canonical upper case with one space before the inward code.

Validate a sign-up form (email, password, name) in one call, with a message per field, in the browser and the API alike.

Check a UK VAT registration number against HMRC's mod-97 checksum, including the post-2010 9755 variant.

Check an NHS number's modulus 11 check digit and normalise it to ten digits.

Check an ISBN-10 or ISBN-13 and convert between them; the normalised form is always the ISBN-13.

Check a UK sort code and account number with the Vocalink/Pay.UK modulus rules, against a table you supply.

Validate one network inventory entry: name, host, ports, optional MAC and subnet, with every problem listed.

Parse Vocalink's VALACDOS.txt and SCSUBTAB.txt into the table UK sort code modulus checking needs.

Compute or check the GS1 mod-10 check digit of any GS1 key: GTIN, SSCC, GLN, GSRN, GDTI, GSIN and the rest.

Check a login form (email, password): the normalised email to look up, or a message for each field to fix.

Check the format of a SWIFT/BIC code (8 or 11 characters) and split it into its parts.

Check a Companies House company number's format and prefix (SC, NI, OC, LP...) and zero-pad it to eight characters.

Check an EAN-8, UPC-A, EAN-13 or GTIN-14 barcode number against the GS1 mod-10 check digit.

Check a double-entry journal: debits equal credits, no zero or two-sided lines, one currency, well-formed account codes.

Normalise a phone number to E.164 (+447700900123) using a default country's trunk and dialling prefixes.

Check a change-password form: current password given and correct, new one meeting the policy and different.

Check a QRISK3 cardiovascular risk input set against the calculator's published ranges; does not compute risk.

The to-do item type (Todo, TodoDraft, Recurrence) and its validators, with a message per field.

Check a coupon against a basket: dates, usage limits, eligible products and minimum spend, with reason codes.

Check a host name against RFC 1123 and RFC 952 label rules and length limits, and normalise it.

Check a date typed into day, month and year boxes, with GOV.UK's error messages and the boxes to mark in error.

Check the format of a commodity code: 6-digit HS, 8-digit CN or 10-digit TARIC/UK code, with chapter and heading checks.

Validate a MAC address in colon, hyphen, Cisco dot or bare form and normalise it, with multicast and local bits.

A "There is a problem" box linking to each field in error, focused on arrival, built from a validator's fields (GOV.UK).

A form's state as a pure reducer: values, touched fields, validator errors and the submit, for useReducer.

Read todos from a CSV file (RFC 4180) as todo.export-csv writes it, checking every row, with row-numbered errors.

Parse, format and check dotted-quad IPv4 addresses, refusing leading zeros, octal, hex and short forms.

Check a new password against a named policy (NIST SP 800-63B-4 by default): length, common passwords, name and email.

Display an NHS number in the 3-3-4 format ("943 476 5919") after checking its modulus 11 check digit.

How long a TLS certificate has left before its notAfter, and whether that is ok, a warning, critical or expired.

Trim an email address and lower-case its domain for storage and lookup, or null if it is not a plausible address.

Ofgem energy price cap unit rate and daily standing charge for a fuel and payment method on a date (GB average).

Bank of England Bank Rate (base rate) in force on a date, from the Bank's official history since 2001.

Freight charge from a carrier's dated weight-break tariff for a zone, with the fuel surcharge in force on the ship date.

Delivery charge from a dated rate table by service, zone, chargeable weight and size, with a free-over threshold.

Sign, verify and decode HS256 JSON Web Tokens (RFC 7519): signature, algorithm and exp/nbf/iat checked with leeway.

Day, month and year boxes under one legend, with hint, error message and the boxes in error marked (GOV.UK date input).

Climate Change Levy on a business supply of electricity, gas, LPG or solid fuel, at the main rate in force on the date.

Turn one typed line like "Pay rent tomorrow !high #home every month" into a todo draft.

Issue an API's HS256 access token, read one from an Authorization header, and refuse revoked or superseded ones.

Compound interest accrued period by period in minor units, the way a statement is built.

Look up the VAT rate in force for a jurisdiction, category and date.

UK Insurance Premium Tax at the standard or higher rate in force on a date, added to or taken out of a premium.

A TLS certificate's expiry state as a check status: ok and warning are up, critical is degraded, expired is down.

NEWS2 early warning score from one set of observations: parameter scores, aggregate and RCP clinical risk band.

A status page component's state from its checks: operational, degraded, partial or major outage, or maintenance.

Whether a Faster Payment fits the scheme maximum, the bank's per-payment limit and what is left of its daily limit.

Gift Aid claim totals for a period from donation records: donor lines, aggregated small gifts, tax due.

Build an 18-digit SSCC pallet label number from extension digit, GS1 company prefix and serial, with its check digit.

kgCO2e from kWh or litres of a fuel, using the UK government GHG conversion factors for the year.

Roaming charges for a trip abroad from a dated tariff table of zones: daily fees, data, calls and texts.

Compare two byte strings in time that does not depend on where they differ, for checking MACs and hashes.

Invoice due date from payment terms: net N days, end of month, N days after month end, day N of next month.

Visitor levy (tourist tax) on an overnight stay: Edinburgh's 5%, Cardiff's per person per night, or a caller's own rule.

Parse "£1,234.50" or "1.234,50 €" into integer minor units, strictly: no guessing, no rounding.

Check a TCP/UDP port number and name the IANA service registered on it, with its system/user/dynamic range.

Apply BOGOF, 3-for-2, percent off, amount off and multibuy deals to a basket, best for the customer, allocated to lines.

The token from an HTTP Authorization header of the form "Bearer <token>" (RFC 6750), or null if it has none.

Calendar days from one ISO date to another, signed: negative when the second date is earlier.

Whether a year is a Gregorian leap year: every 4th, except centuries, except every 400th.

Trial balance from journal lines: debit or credit balance per account, and proof that debits equal credits.

A labelled multi-line text box with hint, error and an optional live character or word count (GOV.UK).

Write todos as a CSV file (RFC 4180) with one column per field, for backups, spreadsheets and other apps.

Merge imported todos into a list by id: an imported todo replaces the one with its id, new ids are appended.

The words and figures to write on a cheque: "One hundred and twenty pounds and fifty pence only", "£120.50".

Working days between two dates, excluding weekends and a caller-supplied holiday list.

Unix time in seconds to an ISO 8601 UTC timestamp such as 2026-09-26T12:00:00Z, for years 0001 to 9999.

Read a tags box as typed, "#Home, work errands", into normalised tags: split on spaces and commas.

English text for a repeating todo's chip: "Every weekday", "Every 2 weeks on Monday", "Every month on the 31st".

When a repeating todo's due date is moved by hand, move its series with it: the new date becomes the anchor.

Move a date forward or back by working days, skipping weekends and a caller-supplied holiday list.

Early settlement discount available on a payment date under "2/10 net 30" style terms, and the amount to pay.

Classify one HTTP probe as up, degraded or down, with a reason and message, from status, body and latency.

The to-do list reducer: add, edit, complete, remove, clear and reorder todos, each returning a new list.

Clean up tags as typed: trim, drop the #, lower-case slug form, drop empties and duplicates, keep the order.

Gestational age (weeks+days) and estimated due date from the last menstrual period by Naegele's rule, cycle-adjusted.

NHS England referral-to-treatment (RTT) wait in days and weekly bands, with the 18-week breach flag.

Adult body mass index (kg/m², 1 decimal place) and its NICE/WHO weight category.

Body surface area in m² by the Mosteller and the DuBois & DuBois formulas, to 2 decimal places.

eGFR in mL/min/1.73 m² by the race-free CKD-EPI 2021 creatinine equation, from creatinine in µmol/L or mg/dL.

Weight-based dose (per kg) capped at a maximum single dose and rounded to a measurable volume, in exact micro-units.

Age in completed months and days on a given date, for paediatric charts and doses; month ends handled like birthdays.

Bookable appointment slots from clinic sessions, a slot length, breaks and existing bookings.

Retention held and released on a construction valuation: full rate, half at practical completion, none at the end.

Interim valuation: gross value to date, retention, previous payments, amount due, VAT or reverse charge, and CIS.

Check a measurement against a nominal size and its upper and lower deviations, in whole micrometres.

A heartbeat's state as a check status for a status page: up, late as degraded, down as down, new as nothing yet.

The scheduled maintenance window in force at a moment, if any, so alerts and uptime can be suppressed during it.

Check pay for a pay reference period against the minimum or living wage for age and apprenticeship.

A password input with a Show/Hide button and an optional live checklist of a password policy (GOV.UK password input).

Whether a cron job that pings on a schedule is new, up, late or down, from its last ping, period and grace time.

Tidy a personal name: trim, collapse whitespace and title-case, with Mc, Mac, O', hyphen and van/de rules.

Fuzzy-match a name against existing clients and parties for a conflict check: normalised, token-sorted Jaro-Winkler.