bai2
BAI2 Parser
Decision gist · record as of 2026-08-14
Yes, if you need to parse or generate BAI2 files and can tolerate Beta status. The library has low install friction, no dependencies, active maintenance, and covers the core use case. However, the maintainers explicitly warn it is not production-ready due to insufficient real-world test data—verify compatibility with your specific bank's BAI2 variant before deploying to production.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Only tested on Python 3.10+, though documented as likely working on 3.7+; requires Python 3.6 or later.
- Low install friction with no runtime dependencies.
- Actively maintained; last commit 2026-03-01 with recent version 0.15.0 (2025-11-04) testing on Python 3.10 through 3.14.
License · maintenance · safety
MIT (permissive) — MIT license (permissive) allows use in commercial and private projects with minimal restrictions.
last release 2025-11-04 (283 days) · last repo commit 2026-03-01 · 30 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 102,820 downloads/mo, #12,845 on PyPI
Alternatives
Verify before relying
pip install bai2
from bai2 import bai2
with open('file.bai2') as f:
bai2_file = bai2.parse_from_file(f)
# or parse from string
bai2_file = bai2.parse_from_string(bai2_data)- Extent of real-world BAI2 file compatibility beyond NatWest, RBS, and JP Morgan implementations mentioned.
- Current production-readiness status given the library's own note about insufficient test data.
- Whether custom transaction type code overrides (TypeCodes) cover all common bank-specific variations.
What it is and what it does
bai2 is a Python parser and writer for BAI2 files, the standard format used by banks to report account balances and transactions for cash management. It reads BAI2 data from files, strings, or line-by-line input and returns structured model objects representing the file hierarchy (Bai2File → Group → Account → TransactionDetail). It can also construct and write BAI2 files programmatically.
The library is actively maintained but explicitly notes it is not yet production-ready due to limited test data. It handles parsing errors, unsupported features, and integrity checks via three exception types. Known to work with files from NatWest, RBS, and JP Morgan, though different banks implement the BAI2 spec with variations. Supports custom transaction type codes for bank-specific extensions.
Use it for
- Parse bank-supplied BAI2 files to extract account balances and transaction details for reconciliation or reporting.
- Integrate bank balance data into accounting or treasury management systems that consume BAI2 format.
- Generate BAI2 files programmatically for cash management data interchange between internal systems and banks.
- Validate BAI2 file integrity by checking control totals and object counts against reported values.
- Handle bank-specific transaction codes by registering custom type codes for non-standard implementations.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need to parse or generate BAI2 files and can tolerate Beta status.
The library has low install friction, no dependencies, active maintenance, and covers the core use case. However, the maintainers explicitly warn it is not production-ready due to insufficient real-world test data—verify compatibility with your specific bank's BAI2 variant before deploying to production.
Install
bai2 on PyPI
Before you install
Low install friction with no runtime dependencies. Actively maintained; last commit 2026-03-01 with recent version 0.15.0 (2025-11-04) testing on Python 3.10 through 3.14. Development status is Beta.
Only tested on Python 3.10+, though documented as likely working on 3.7+; requires Python 3.6 or later.
License in practice
MIT license (permissive) allows use in commercial and private projects with minimal restrictions.
Quickstart
pip install bai2
from bai2 import bai2
with open('file.bai2') as f:
bai2_file = bai2.parse_from_file(f)
# or parse from string
bai2_file = bai2.parse_from_string(bai2_data)Verify before relying
- Extent of real-world BAI2 file compatibility beyond NatWest, RBS, and JP Morgan implementations mentioned.
- Current production-readiness status given the library's own note about insufficient test data.
- Whether custom transaction type code overrides (TypeCodes) cover all common bank-specific variations.
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.6 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Actively maintained 283 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 102,820 / month, #12,845 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 4 - BetaIntended Audience :: DevelopersLicense :: OSI Approved :: MIT LicenseNatural Language :: EnglishOperating System :: OS IndependentProgramming Language :: Python :: 3Programming Language :: Python :: 3 :: OnlyProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Topic :: Software Development :: Libraries :: Python Modules |
Evidence: bai2-0.15.0-py3-none-any.whl
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