Nepal's tax and market rates, as JSON

Conventions

• Every file has dataset, updated (the date its figures were last checked against the source) and sources (a list of { "title", "url" }; url is optional).
• Rates are percentages: 13 means 13%, and 0.015 means 0.015%.
• Amounts are whole rupees (NPR). An upper bound of null means the slab has no upper limit.
• Shares with no exact decimal are fractions in a string, such as "1/3".
• Dates are AD, as YYYY-MM-DD. Fiscal-year files also give the start of the year in Bikram Sambat: "starts": { "bs": "2083-04-01", "ad": "2026-07-17" }.
• Each fiscal year is its own file and is never changed afterwards except to fix a mistake, so a calculation for a past year keeps working. A change that would break existing readers goes in /v2/.
• Responses can be cached for up to 10 minutes. Any website can fetch the files: they are sent with Access-Control-Allow-Origin: *.
• Python's built-in urllib is turned away unless it sends its own User-Agent header, as in the Python examples below. Other clients work as they are.

Errors

An address with no file behind it, such as a fiscal year that isn't published yet, returns 404 with GitHub Pages' HTML error page rather than JSON. Check res.ok (or the status code) before parsing, and use index.json to see which files exist.