Currency Minor Unit Lint

Finds the money lines that send the wrong amount to a payment API: the x100 that charges 100x in JPY, the toFixed(2) that truncates KWD, and the currency codes that stopped being legal tender.

Install

npx @readystack/currency-minor-unit-lint file

Node 18+. The same 24 rules as the VS Code extension, from a terminal or CI.

Free

• Checks the file you have open against all 24 rules and names every wrong amount, its currency, its ISO 4217 exponent and the date a code changed - no key, no limit, no watermark.
• --rules lists every rule

With a licence ($29 once)

• Scans every file in the repository, fails a CI build before a wrong amount can merge, exports the findings as CSV, JSON or HTML, and rewrites the retired currency codes in place.

@readystack/currency-minor-unit-lint --dir ./templates --report html --out report.html

Payment processors publish a $15.00 fee for every dispute received, and it is not returned when you lose the dispute.

Use from an AI agent (MCP)

Claude Code · Cursor · Windsurf · any MCP client - add to your MCP config:

{ "mcpServers": { "currency-minor-unit-lint": { "command": "npx", "args": ["-y", "@readystack/currency-minor-unit-lint", "--mcp"] } } }

Tools: check_text and check_file (free) · check_dir (licence). The agent gets every finding with the line number.

Use in CI

- name: Currency Minor Unit Lint
  run: npx -y @readystack/currency-minor-unit-lint --dir . --ci

(container: docker run --rm -v "$PWD:/work" getreadystack/currency-minor-unit-lint --dir /work --ci)

The folder sweep, reports and CI mode need one licence — one payment, no subscription. Set READYSTACK_LICENSE=<key> or run --license <key> once.

Get a licence