​ To learn more, see the sources I considered: [[1] Code Tool](https://docs.retellai.com/build/single-multi-prompt/code-tool) [[2] Code Node](https://docs.retellai.com/build/conversation-flow/code-node) ​

### Answer Based on the available documentation for both Code Tool and Code Node, here's what JavaScript syntax is supported: **Async/await**: Yes, async/await is explicitly supported. Top-level

await

is supported. [(1) ]() [(2) ]() **Standard JavaScript built-ins**: Yes, including

Math

,

JSON

,

Date

,

Array

,

Object

, and

String

methods. This means: - **JSON.parse() **: Yes, supported as part of the

JSON

built-in - **encodeURIComponent() **: Yes, shown in example code:

encodeURIComponent(dv.city)

- **const declarations**: Yes, used throughout the example code - **for loops with let**: Yes, modern JavaScript syntax is supported - **.replace() with regex**: Yes,

String

methods are available **What's NOT supported**: External packages (

require

,

import

) are not available. You must use

fetch()

for external integrations. **Code limitations**: Code is limited to 5,000 characters. **What causes errors**: The documentation doesn't specify what triggers a "bad code" error specifically. However, common issues would likely include: - Exceeding the 5,000 character limit - Attempting to use

require

or

import

- Syntax errors in your JavaScript - Code that exceeds the timeout period (5-60 seconds, default 30 seconds) The JavaScript environment is modern and supports ES6+ features like

const

,

let

, arrow functions, template literals, and async/await.

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.