Docs

Start here for a guided overview, then dive into the full reference.

Getting Started

• What is RexxJS? A modern REXX targeting Node.js, browsers, and a standalone binary, with rich built‑in libraries.
• Try it in your browser: Online REPL
• Browse the full Reference

Key Topics

• Language Basics — Basic Syntax, Control Flow, Advanced Statements
• Everyday Functions — Strings, Math, Arrays, Date/Time
• Data & Web — JSON, Web, Filesystem, SQLite Address
• Reliability — Error Handling, Assertions & Expect, Testing with rexxt
• Orchestration — Application Addressing, ADDRESS Patterns, Require System

Examples

Hello world with arrays and mapping:

LET nums = [1,2,3,4]
LET doubled = MAP(nums, "x * 2")
SAY doubled

Fetch JSON and validate a field:

LET data = JSON_PARSE(URL_READ("https://api.example.com/todo/1"))
IF IS_OBJECT(data) & data.id = 1 THEN SAY "ok"

Next Steps

• Explore the Function Reference
• Learn the REPL
• See Interpolation Patterns