# `afterGenerate(callback(data) => { ... })`

A hook to adjust the fixture output (`object`) of the HelixSpec that is called right after the fixture is [generated](./generate.md).

### Arguments

| Argument   | Type       | Description                                        |
| ---------- | ---------- | -------------------------------------------------- |
| `callback` | `function` | Callback function to adjust the fixture data.      |
| `data`     | `object`   | Generated fixture data passed into the `callback`. |

### Returns

`HelixSpec`: Returns itself.

### Example

```js
const Dinosaur = createSpec({
  id: faker.datatype.number(),
  name: faker.name.firstName(),
  location: faker.address.country(),
});

Dinosaur.afterGenerate((data) => {
  const { name } = data;
  return {
    name,
    location: "Mexico",
    status: "Happy",
    email: "noop@superprivacy.com",
  };
});

Dinosaur.generate();
// {
//   name: 'Alice',
//   location: 'Mexico'
//   status: 'Happy',
//   email: 'noop@superprivacy.com'
// }
```