Luxon-jsonata NPM

JSONata is a great tool for transforming JSON data, but the date and time manipulation functions that it provides are lacklustre. This package adds a simple binding for Luxon's DateTime, Duration and Interval objects so they can be used directly in JSONata expressions.

Getting Started

import addLuxon from "luxon-jsonata";
import jsonata from "jsonata";

const expr = jsonata(
  '$Duration.fromISO("P2M").plus({"months":3, "days":10}).toISO()'
);

addLuxon(expr);

console.log(expr.evaluate({}));

// Result is "P5M10D"

Caveats

Not all methods are going to work. In particular, methods that themselves take functions, or require a standard Date object are a bit awkward to use in JSONata. Perhaps in future we can dynamically remove these from the bound objects.

For Luxon member functions that themselves take functions, like Duration.mapUnits, you can assign a Javascript function to the expression that takes the object and performs the operation you need:

const double = (x: Duration) => x.mapUnits((u) => u * 2);

const expr = jsonata(
  "$double($Duration.fromObject({ 'hours': 1, 'minutes': 30 })).toObject()"
);

addLuxon(expr);
expr.assign("double", double);

console.log(expr.evaluate({}));

// Result is { hours: 2, minutes: 60 }