billfox 0.2.2

Composable document data extraction: load, preprocess, OCR, LLM parse, store with vector search.

billfox

Composable document data extraction: load, preprocess, OCR, LLM parse, store with vector search.

billfox is a Python library that lets you build document processing pipelines from independent, swappable stages. Each stage implements a simple protocol, so you can mix built-in modules with your own.

Architecture

                          billfox pipeline
 ┌─────────┐  ┌──────────────┐  ┌───────────┐  ┌────────┐  ┌───────┐
 │  Source  │→ │ Preprocessor │→ │ Extractor │→ │ Parser │→ │ Store │
 │         │  │   (optional)  │  │   (OCR)   │  │ (LLM)  │  │       │
 └─────────┘  └──────────────┘  └───────────┘  └────────┘  └───────┘
  LocalFile    Resize, YOLO,     MistralOCR     LLMParser   SQLite +
               Chain                            (any LLM)   hybrid
                                                            search

Protocols at every boundary -- implement DocumentSource, Preprocessor, Extractor, Parser[T], Embedder, or DocumentStore[T] to plug in your own components.

Installation

# Core only (just types and protocols)
pip install billfox

# With Mistral OCR
pip install 'billfox[mistral]'

# With LLM parsing (pydantic-ai)
pip install 'billfox[llm]'

# With SQLite storage and search
pip install 'billfox[store]'

# With CLI
pip install 'billfox[cli]'

# Everything
pip install 'billfox[all]'

Quick Start

1. OCR Only -- Extract Markdown from a Document

import asyncio
from billfox.source import LocalFileSource
from billfox.extract import MistralExtractor

async def main():
    source = LocalFileSource()
    extractor = MistralExtractor()  # uses MISTRAL_API_KEY env var

    doc = await source.load("invoice.pdf")
    result = await extractor.extract(doc)
    print(result.markdown)

asyncio.run(main())

2. Full Pipeline -- OCR + LLM Parse + Store

import asyncio
from pydantic import BaseModel
from billfox import Pipeline
from billfox.source import LocalFileSource
from billfox.extract import MistralExtractor
from billfox.parse import LLMParser
from billfox.preprocess import ResizePreprocessor
from billfox.store import SQLiteDocumentStore

class Invoice(BaseModel):
    vendor_name: str
    total: float
    date: str

async def main():
    pipeline = Pipeline(
        source=LocalFileSource(),
        extractor=MistralExtractor(),
        parser=LLMParser(
            model="openai:gpt-4.1",
            output_type=Invoice,
            system_prompt="Extract invoice fields from this document.",
        ),
        preprocessors=[ResizePreprocessor(max_side=1024)],
        store=SQLiteDocumentStore(db_path="invoices.db", schema=Invoice),
    )

    invoice = await pipeline.run("scan.jpg", document_id="inv-001")
    print(f"{invoice.vendor_name}: ${invoice.total}")

asyncio.run(main())

3. CLI -- Process from the Terminal

# Extract markdown via OCR
billfox extract receipt.jpg

# Parse into structured JSON
billfox parse receipt.jpg --schema ./models.py:Receipt --model openai:gpt-4.1

# Search stored documents
billfox search "coffee" --db invoices.db

# Configure API keys
billfox config set api_keys.mistral sk-...

Optional Extras

Extra	Packages	Use case
mistral	mistralai	Mistral OCR extraction
yolo	onnxruntime, numpy, Pillow	YOLO document cropping
llm	pydantic-ai	LLM structured parsing
openai	openai	OpenAI text embeddings
store	sqlalchemy, aiosqlite, sqlite-vec	SQLite storage + search
cli	typer, rich, tomli-w	Command-line interface
all	All of the above	Everything

Documentation

Full documentation is available at docs/:

• Getting Started
• Custom Extractor
• Custom Preprocessor
• Storage and Search

Contributing

See CONTRIBUTING.md for development setup, running tests, and submitting pull requests.

License

MIT -- see LICENSE for details.