Rakexl - Extended Grammar for JEXL

Rakexl is an opinionated fork of jexl-extended by Niko Raes, which extends the Jexl expression parser and evaluator by TomFrost.

Features

• 80+ Built-in Functions - String manipulation, math, arrays, objects, dates, and more
• Monaco Editor Support - Syntax highlighting, IntelliSense, and hover documentation
• TypeScript Support - Full type definitions included
• Modular - Use the entire library or import individual functions

Documentation

Full documentation available at rxl.rakerone.sh

Installation

npm install rakexl

Quick Start

import jexl from 'rakexl';

const data = [
  {name: "John", age: 32},
  {name: "Jane", age: 34},
  {name: "Bob", age: 33}
];

const result = jexl.evalSync('data|filter("value.age > 32")|map("value.name")|join(", ")', {data});
// "Jane, Bob"

Monaco Editor Integration

Get a rich IDE experience for JEXL expressions:

import * as monaco from 'monaco-editor';
import { Monaco } from 'rakexl';

// Register JEXL language support
Monaco.registerJexlLanguage(monaco);

// Create editor with JEXL support
const editor = Monaco.createJexlEditor(monaco, document.getElementById('editor'), {
  value: 'users|filter("value.active")|map("value.name")|sort',
  theme: 'vs-dark'
});

It is also possible to use the extended grammar in the original Jexl library by importing parts of the grammar you need and adding it to the Jexl instance.

import jexl from 'jexl';
import { arrayMap } from 'rakexl/extended-grammar';

jexl.addTransform('map', arrayMap);
const result = jexl.evalSync('[{name:"tek",age:32}, {name:"bar",age:34}, {name:"baz",age:33}, {name:"foo",age:35}]|map("value.age")');
// [32, 34, 33, 35]

Related Projects

• Jexl - The original JavaScript implementation of JEXL that this library extends
• jexl-rs - A Rust-based JEXL parser and evaluator
• PyJEXL - Mozilla's Python-based JEXL parser and evaluator