jsonata-rs

Python bindings for the Rust port of jsonata-java.

PyPI distribution name: jsonata-rs — pip install jsonata-rs
Import name: jsonata — import jsonata
Requires Python ≥ 3.11; published as a single abi3 wheel per platform (Linux amd64 + arm64, macOS arm64).

import jsonata

expr = jsonata.Jsonata("Account.Order.Product.(Price * Quantity) ~> $sum()")
expr.evaluate(data)            # evaluate against a dict / list / scalar

# variable bindings
jsonata.Jsonata("$x + 1").evaluate(None, {"x": 41})   # -> 42

# one-shot convenience
jsonata.evaluate("a + b", {"a": 2, "b": 3})           # -> 5

# custom functions written in Python
e = jsonata.Jsonata("$greet(name)")
e.register_function("greet", lambda n: f"Hello, {n}!")
e.evaluate({"name": "World"})                          # -> "Hello, World!"

Errors raise jsonata.JsonataError with .code (e.g. "S0201") and .position. An internal engine bug (a caught Rust panic) raises jsonata.JsonataInternalError — a subclass of JsonataError, so existing handlers still catch it — with .code == "PANIC" and a .panic_location.

try:
    result = jsonata.Jsonata(expr).evaluate(data)
except jsonata.JsonataError as e:
    print(e.code, e.position)   # e.g. "S0201" 4

Type checking

The package ships PEP 561 type information (a jsonata.pyi stub plus a py.typed marker), so mypy and pyright type the full public API out of the box — including JsonataError.code: str, .position: int, and JsonataInternalError.panic_location: str | None. No stub package to install.

Value mapping

JSONata	Python
number	`int` (whole) / `float`
string	`str`
boolean	`bool`
null	`None`
undefined	`None`
array	`list`
object	`dict`

Building

pip install maturin
maturin build --release -m crates/jsonata-py/Cargo.toml   # wheel in target/wheels/
# or for local dev:
maturin develop --release -m crates/jsonata-py/Cargo.toml

CI (.github/workflows/CI.yml) cross-builds wheels for amd64 + arm64 across Linux (manylinux + musllinux) and macOS with PyO3/maturin-action, and publishes to PyPI with pypa/gh-action-pypi-publish (Trusted Publishing) on tag pushes.

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