PyJEXL-Extended

Python implementation of the JEXL expression language with extended grammar—over 80 built-in functions and transforms for strings, numbers, arrays, objects, dates, and more.

NOTE: This library is based on TomFrost's JEXL and extends the original mozilla/pyjexl with a rich set of features inspired by jexl-extended.

Features

• 🚀 80+ Built-in Functions & Transforms: String manipulation, math, arrays, objects, dates, and more
• 🧩 Modular Grammar: Use the entire library or import individual functions
• 🐍 Pythonic Semantics: Type-safe, predictable behavior
• 🧪 Extensible: Add your own functions, transforms, and operators

📚 Full Documentation: https://docs.konnektr.io/docs/jexl/

Quick Start

Install:

pip install pyjexl-extended

Basic usage:

from pyjexl.jexl_extended import JexlExtended

context = {
    "users": [
        {"name": "John", "age": 32},
        {"name": "Jane", "age": 34},
        {"name": "Bob", "age": 33}
    ]
}

jexl = JexlExtended(context)
result = jexl.eval('users|filter("value.age > 32")|map("value.name")|join(", ")')
# "Jane, Bob"

Extended Grammar Examples

• String: "hello world"|uppercase → "HELLO WORLD"
• Array: [1,2,3]|sum → 6
• Object: {foo:1, bar:2}|keys → ['foo', 'bar']
• Date: now() → ISO datetime string
• Math: 10.123456|round(2) → 10.12

See jexl-extended for the full list of available functions and transforms.

Playground

Try out expressions interactively:

• JEXL Playground

Related Projects

• jexl-extended (TypeScript) — The original extended grammar for JEXL
• JexlNet (C#) — C# implementation with extended grammar
• PyJEXL (Mozilla) — Original Python JEXL parser
• jexl-rs (Rust) — Rust-based JEXL parser

License

Licensed under the MIT License. See LICENSE for details.