js-to-json-logic

This is a Python library that parses a JavaScript expression and converts it into a JsonLogic-compatible object.

This is useful for cases where you want to allow users to input logical expressions in a familiar syntax, but you want to evaluate them using JsonLogic.

This library is inspired by the JavaScript library js-to-json-logic.

Usage

from json_logic import jsonLogic
from js_to_json_logic import transform_js

rule = transform_js("a > 5 && b < 10")
result = jsonLogic(rule, {"a": 6, "b": 8})

print(result)  # True

Supported JavaScript Syntax

Type	Example
Literals	42, "hello", true, false, null
Identifiers	a, b, myObject.property
Template literals	`Hello, ${name}!`
Arrays	[1, 2, 3], [1, 2, ...rest]
Unary operations	!a, !!b, -x, +x
Conditionals	a > 5, b < 10, c >= 15
Arithmetic	a + b, a - b, a * b, a / b, a % b
Equality and inequality	a == 5, b !== 10, c === 15, d !== 20
Logical expressions	a && b, a || b
If statements	if (a > 10) { "large" } else if (a > 5) { "medium" } else { "small" }
Ternaries	a > 5 ? "yes" : "no"
Call expressions	myFunction(a, b)
Regex literals	/^abc$/gi
Arrow functions	x => x > 5

License

This project is licensed under the terms of the MIT license.