Validate an ORCID iD (researcher identifier) with its ISO 7064 check character and give the canonical form.

Validate a 20-character Legal Entity Identifier with the ISO 7064 mod 97-10 check and split its parts.

Validate a 17-character vehicle VIN check digit and decode region, manufacturer code and model-year candidates.

Parse CSV text (quotes, escaped quotes, embedded commas and newlines) into JSON rows, detecting the delimiter.

Room air-conditioner BTU from floor area (ENERGY STAR chart), tons, and an under- or over-sizing check against a load.

R-value and U-factor of a wall or roof assembly from layers and thickness, with a framing-fraction correction and heat flow.

Validate a 9-character CUSIP security identifier check digit and split issuer and issue codes.

Validate a UPC-A, EAN-8, EAN-13 or GTIN-14 barcode check digit and name its format.

Validate a securities ISIN check digit and split it into country code and national security number.

Pretty-print or minify JSON, optionally sorting keys, and report the size before and after.

Check whether text is valid JSON; if not, return the error with line and column. If valid, report type, size and depth.

Split a URL into scheme, host, port, path, query parameters and fragment, and flag credentials, IP hosts and odd ports.

Extract one value from JSON by a simple path such as a.b[0].c, with its type; reports exactly where a path breaks.

Is the US stock market (NYSE/Nasdaq) open right now or at a given time: session, hours, early close and the next open.

NYSE market holidays and 1 PM early closes for a year, with the weekday of each, from the exchange's published rules.

Is a date a public holiday in a country? Also whether it is a business day and the next holiday after it.

Long weekends in a year for a country, with length in days and the bridge days that would extend them.

Validate a UUID and read its version, variant and, for v1 and v7, the embedded timestamp.

The next upcoming public holidays in a country within the coming year, with days until each.

US monthly equity option expirations for a year: third Friday, moved to Thursday on a market holiday; flags triple witching.