@rustledger/wasm
v0.8.5TypeScript
Beancount WebAssembly bindings for JavaScript/TypeScript
0/weekUpdated yesterdayGPL-3.0-onlyUnpacked: 3.3 MB
Published by robcohen
npm install @rustledger/wasmrustledger
A blazing-fast Rust implementation of Beancount
Parse and validate your ledger faster than Python beancount.
---
Why rustledger?
| | |
|---|---|
| 10-30x faster | Parse and validate large ledgers in milliseconds (see benchmarks) |
| No dependencies | No Python runtime, no libraries to install |
| Drop-in replacement | Compatible bean-* CLI commands for easy migration |
| Full compatibility | Parses any valid beancount file |
| Editor support | LSP server for VS Code, Neovim, Helix, and more |
| AI-ready | MCP server for Claude, Cursor, and other AI assistants |
| Runs anywhere | WebAssembly support for browser and Node.js |
| Better errors | Detailed error messages with source locations |
| 20 built-in plugins | Plus Python plugin compatibility via WASI sandbox |
Install
| Platform | Command |
|----------|---------|
| macOS | brew install rustledger/rustledger/rustledger |
| Windows | scoop bucket add rustledger https://github.com/rustledger/scoop-rustledger && scoop install rustledger |
| Cargo | cargo binstall rustledger or cargo install rustledger |
| Fedora/RHEL | sudo dnf copr enable robcohen/rustledger && sudo dnf install rustledger |
| Nix | nix run github:rustledger/rustledger |
| Docker | docker run --rm -v "$PWD:/data" ghcr.io/rustledger/rustledger /data/ledger.beancount |
| Binaries | GitHub Releases |
| npm (WASM) | npm install @rustledger/wasm |
| npm (MCP) | npx @rustledger/mcp-server (Model Context Protocol server) |
Missing your platform? Open an issue to request it.
Quick Start
``bash`
rledger check ledger.beancount
rledger query ledger.beancount "SELECT account, SUM(position) GROUP BY account"
CLI Commands
| Command | Description |
|---------|-------------|
| rledger check | Validate ledger files with detailed error messages |rledger query
| | Run BQL queries (interactive shell or one-shot) |rledger format
| | Auto-format beancount files |rledger report
| | Generate balance, account, and statistics reports |rledger doctor
| | Debugging tools for ledger issues |rledger extract
| | Import transactions from CSV/OFX bank statements |rledger price
| | Fetch commodity prices from online sources |
Python beancount users can also use bean-check, bean-query, etc.
CLI examples
`bashValidate with plugins
rledger check --native-plugin auto_accounts ledger.beancount
Interactive query shell
rledger query ledger.beancount
One-shot query
rledger query ledger.beancount "SELECT date, narration WHERE account ~ 'Expenses:Food'"
Reports
rledger report ledger.beancount balances
rledger report ledger.beancount stats
Format in place
rledger format --in-place ledger.beancount
`
Crates
| Crate | Description |
|-------|-------------|
|
| CLI tool (rledger check, rledger query, etc.) |
| rustledger-core | Core types: Amount, Position, Inventory |
| rustledger-parser | Lexer and parser with error recovery |
| rustledger-loader | File loading and includes |
| rustledger-booking | Interpolation and 7 booking methods |
| rustledger-validate | 27 validation error codes |
| rustledger-query | BQL query engine |
| rustledger-plugin | 20 built-in plugins + Python plugin support |
| rustledger-importer | CSV/OFX import framework |
| rustledger-lsp | Language Server Protocol for editor integration |
| rustledger-wasm | WebAssembly bindings for JavaScript/TypeScript |
Booking methods (7)
| Method | Description |
|--------|-------------|
|
STRICT | Lots must match exactly (default) |
| STRICT_WITH_SIZE | Exact-size matches accept oldest lot |
| FIFO | First in, first out |
| LIFO | Last in, first out |
| HIFO | Highest cost first |
| AVERAGE | Average cost basis |
| NONE | No cost tracking |
Built-in plugins (20)
| Plugin | Description |
|--------|-------------|
|
auto_accounts | Auto-generate Open directives |
| auto_tag | Automatically tag transactions |
| check_average_cost | Validate average cost bookings |
| check_closing | Zero balance assertion on account close |
| check_commodity | Validate commodity declarations |
| check_drained | Ensure accounts are drained before close |
| close_tree | Close descendant accounts |
| coherent_cost | Enforce cost OR price (not both) |
| commodity_attr | Validate commodity attributes |
| currency_accounts | Enforce currency constraints on accounts |
| document_discovery | Auto-discover document files |
| implicit_prices | Generate price entries from transaction costs |
| leafonly | Error on postings to non-leaf accounts |
| noduplicates | Hash-based duplicate transaction detection |
| nounused | Warn on unused accounts |
| onecommodity | Single commodity per account |
| pedantic | Enable all strict validations |
| sellgains | Cross-check capital gains against sales |
| unique_prices | One price per day per commodity pair |
| unrealized | Calculate unrealized gains |Python plugins: Run existing Python beancount plugins via CPython-WASI sandbox.
Performance
Benchmarks run nightly on 10K transaction ledgers. View workflow →
Benchmark details
What's measured:
- Validation: Parse ledger + validate (balance assertions, account opens, etc.)
- Balance Report: Parse + compute all account balances
Memory efficiency:
rustledger typically uses 3-5x less memory than Python beancount thanks to Rust's zero-cost abstractions and efficient data structures.
Run locally:
`bash
Quick comparison (requires nix)
nix develop .#bench
./scripts/bench.shCriterion micro-benchmarks
cargo bench -p rustledger-core
cargo bench -p rustledger-parser
``See BENCHMARKING.md for detailed benchmark documentation.
Contributing
See CLAUDE.md for architecture and development setup.
By submitting a pull request, you agree to the Contributor License Agreement.
License
Commercial licensing available - contact us for proprietary license options.
Funding
rustledger is free and open source. If you find it useful, consider supporting development:
