#format

A fast, fully-local number toolkit: spell numbers out in English words (great for amount-in-words on invoices and cheques), format ordinals (1st, 2nd, 112th), convert integers to and from Roman numerals (1 to 3999), convert numbers between any bases from 2 to 36, and format numbers locale-aware as decimal, currency or percent. Every endpoint accepts input via the query string or the request body. Pure server-side compute, no third-party upstream, so responses are instant and always available. Ideal for invoicing and billing, localization, education and developer formatting tooling.

api.oanor.com/number-api

A fast, fully-local XML toolkit: convert XML to JSON and JSON to XML with configurable attribute handling, validate XML well-formedness with line and column error details, and pretty-print XML while preserving element order. Every endpoint accepts input via the query string or the request body, up to 2 MB. Pure server-side compute, no third-party upstream, so responses are instant and always available. Ideal for system integrations, SOAP and legacy interop, RSS and sitemap processing, config tooling and data pipelines.

api.oanor.com/xml-api

A fast, fully-local date and time toolkit (UTC): parse any date string or unix timestamp into ISO, unix and components with the ISO week number, day-of-year and leap-year flag; format dates with custom tokens (YYYY-MM-DD, weekday and month names, and more); add or subtract month-aware durations; compute the difference between two dates in every unit plus a human-readable summary; and convert between unix timestamps and ISO. Every endpoint accepts input via the query string or the request body. Pure server-side compute, no third-party upstream, so responses are instant and always available. Ideal for scheduling, billing periods, reminders, analytics and any date arithmetic. (For the current time in a specific timezone, see the oanor Time API.)

api.oanor.com/datetime-api

A fast, fully-local JSON and CSV toolkit: validate JSON (with a clear error message, type and size), pretty-print and format it (with optional deep key-sorting), minify it (reporting bytes saved), and convert between CSV and JSON — RFC-4180 CSV parsing with automatic value typing, and JSON arrays to CSV. Every endpoint accepts input via the query string or the request body (up to 1 MB). Pure server-side compute, no third-party upstream, so responses are instant and always available. Ideal for data pipelines, ETL, webhooks, config tooling and developer utilities.

api.oanor.com/json-api