Supported JavaScript Features

The MODLR scripting engine includes a small set of common JavaScript utilities that web and Node.js developers typically expect.

These features behave similarly to their browser counterparts and are safe to use inside MODLR scripts.

Available Features

URL Utilities

• URL
  https://developer.mozilla.org/en-US/docs/Web/API/URL
• URLSearchParams
  https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams

Base64 Helpers

• atob
  https://developer.mozilla.org/en-US/docs/Web/API/atob
• btoa
  https://developer.mozilla.org/en-US/docs/Web/API/btoa

Standard JavaScript Language Features

The scripting engine supports a modern subset of ECMAScript (ES2020+).

This includes most commonly used language features such as:

• let / const
• Arrow functions
• Destructuring
• Spread (...)
• Template strings
• Optional chaining (?.)
• Nullish coalescing (??)
• Modern array methods (map, filter, reduce, etc.)

If it's standard, non-async JavaScript syntax, it will generally work as expected.

Not Supported

The scripting engine does not currently support:

• async/await
• Promises
• fetch()
• DOM or browser APIs
• setTimeout / setInterval