Javascript Code Execution

Run custom JavaScript scripts directly inside your workflow. Use it for fast data formatting, string manipulation, date operations, or lightweight logic between nodes.

1. Add the Module

Add the JavaScript Code module to your workflow as an action node.

2. Pass Data In Context

In the module configuration panel, add context variables under the Context section. Each entry takes a Name and a Value use the variable picker to map values from upstream nodes.

Each context entry becomes a key on WORKFLOW_CONTEXT inside your script:

function main(WORKFLOW_CONTEXT) {
    const amount = WORKFLOW_CONTEXT.amount;
    const currency = WORKFLOW_CONTEXT.currency;
}

3. Write Your Script

Your script must define a main function. Stacksync automatically injects WORKFLOW_CONTEXT as the argument containing all your context values.

function main(WORKFLOW_CONTEXT) {
    const amount = WORKFLOW_CONTEXT.amount;
    const currency = WORKFLOW_CONTEXT.currency;
    return {
        amount: amount,
        currency: currency
    };
}

4. Return Data

Whatever main returns becomes the node's output, available to downstream nodes via standard node referencing.

Reference in downstream nodes:

{{ your_module_id.amount }}
{{ your_module_id.currency }}

Debugging: console.log() output is captured and surfaced under metadata.stdout in the execution logs. Use it for debugging, it does not pass data downstream.

Available Libraries

Library	Use case
dayjs	Date parsing and formatting
moment	Date manipulation
live-plugin-manager	Dynamic module loading
Node.js 23 standard library	All built-in modules

Note: You cannot install additional packages at runtime with npm install.

Limits

Limit	Value
Timeout	6s
Memory	8 GB
Filesystem	Read-only, no writes
Runtime packages	Pre-installed only

Watch out: Avoid using JavaScript for slow HTTP calls, heavy loops, or large dataset operations as the timeout is 6 seconds, use the Python Code module instead.