react-currency-converter — Vite Tool Template

This is a React + Vite currency conversion tool template, positioned as a starting project that can be cloned and run directly. Exchange rate data comes from the open API provided by AllRatesToday, sourced from official rate tables published by 121 central banks and 3 tax authorities, including the European Central Bank, the Federal Reserve, the Bank of England, the Reserve Bank of India, and HM Revenue & Customs. The API requires no API key and no self-hosted backend, so requests can be made without additional configuration.

The conversion logic is centralized in src/rates.js: it requests https://allratestoday.com/api/open/central-bank/<bank> and parses any currency pair from the rate table published by that central bank. There are three parsing methods—direct quotation, taking the reciprocal, or cross-conversion via the central bank's local currency; the interface indicates which method the current result uses, because this distinction affects results in invoicing and tax filing scenarios.

It should be noted that official rate tables are daily fixings, not real-time quotes. If real-time mid-market rates covering more than 160 currencies are needed, a free API key must be requested, and calls must be made server-side to avoid exposing the key in the browser; the repository also includes a Next.js starter project demonstrating this server-side call approach. If only static data is needed, the central-bank-exchange-rates repository from the same organization publishes all rate tables daily in JSON and CSV format, hosted on jsDelivr.

The code is MIT licensed and may be used, modified, used commercially, and distributed for free; when distributing, the copyright notice and the full license notice must be retained. Exchange rate data may be used for free, but attribution to AllRatesToday is required. Licenses for third-party assets such as demo images, fonts, and icons must be checked separately, and external services such as domains and hosting may incur costs.