> ## Documentation Index
> Fetch the complete documentation index at: https://docs.versori.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Inputs and outputs

Each task is called with a context object which contains some input data on the `data` property. The task is expected to
return some output data which will be used as the input for the next task.

<Warning>
  The return value of the task should be a serializable by `JSON.stringify()`, or a Promise which resolves to a
  serializable value.

  Users **should not** return the context object as this will cause the runtime to fail.
</Warning>

```typescript theme={null}
import { webhook } from '@versori/run';

/**
 * Send the following payload:
 *  {
 *    "items": [
 *      { "sku": "123", "price": 100 },
 *      { "sku": "456", "price": 200 },
 *    ]
 *  }
 * 
 * The workflow will return the following payload:
 *  {
 *    "skus": ["123", "456"],
 *    "total": 300,
 *  }
*/
const workflow = webhook('my-webhook')
    .then((ctx) => {
        if (typeof ctx.data !== 'object') {
            throw new Error('Body must be an object');
        }

        if (!ctx.data.items) {
            return [];
        }

        if (!Array.isArray(ctx.data.items)) {
            return [ctx.data.items];
        }

        // the next task's input will be an array of items
        return ctx.data.items;
    })
    .then((ctx) => ({
        skus: ctx.data.map((item) => item.sku),
        total: ctx.data.reduce((acc, item) => acc + item.price, 0),
    }));
```