# achkit

> The ACH file toolkit for developers. Generate, parse and validate NACHA ACH
> files in a few lines. Fully typed, zero dependencies, returns and NOC handled.
> Available for JavaScript/TypeScript (npm) and Python (PyPI) with byte-identical
> output across both languages. MIT licensed.

## Install

- npm: `npm i achkit`
- PyPI: `pip install achkit`

## What it does

- Generate NACHA ACH files: a typed builder that pads, balances batches, computes
  entry hash and file/batch control totals, and adds block padding automatically.
- Parse ACH files into a typed model with no positional string slicing.
- Validate files against reconciliation rules: ABA routing checksum, entry hash,
  batch and file control totals, blocking factor - the errors an ODFI rejects on.
- Returns (R-codes) and Notification of Change (C-codes) decoding.
- SEC codes: PPD, CCD, WEB, TEL, CTX and addenda.
- Money is always integer cents; dates are always YYYY-MM-DD.

## Links

- Docs and source: https://github.com/achkit/achkit
- npm: https://www.npmjs.com/package/achkit
- PyPI: https://pypi.org/project/achkit

## Hosted validation API

achkit.com offers a hosted validation API adding live routing-number validity,
NACHA rule updates pushed as they take effect, and return-file monitoring with
webhooks - the parts that cannot ship as a static library.