How should exchange-rate JSON be stored?
A common structure stores base, date, rates, data source, and update timestamp.
Choose a base currency and generate exchange-rate JSON or CSV for multi-currency forms, pricing systems, finance reports, and API debugging.
offline reference
A common structure stores base, date, rates, data source, and update timestamp.
CSV works well for reports, Excel, Google Sheets, and bulk imports into pricing or finance systems.
Use it as a reference. Production systems need licensing, caching, error handling, auditability, and SLA.