> For the complete documentation index, see [llms.txt](https://blobbi.gitbook.io/fractale/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://blobbi.gitbook.io/fractale/options.md).

# Options

```javascript
'use strict';

const Fractale = require('fractale');

Fractale.setOptions({
    use_moment: () => { try { require('moment'); return true; } catch (error) { return false; }}, // Specify to fractale to transform date to moment instance
});
```

## Field options

```javascript
'use strict';

const Fractale = require('fractale');

const Child = Fractale.create('Child', {
    mixed: undefined,
    boolean: Boolean,
    number: Number,
    string: String,
});

const Parent = Fractale.create('Parent', Child, {
    parent: Fractale.with(Fractale.SELF, {
        // Pass number of parent to number of great-parent
        through: ['number'],
    }),
    children: [
        Fractale.with(Child, {
            // Pass number of parent to mixed of child
            // Pass string of parent to string of child
            through: { number: 'mixed', string: 'string' },
        })      
    ],
});
```

## Field validators

```javascript
'use strict';

const Fractale = require('fractale');

const Simple = Fractale.create('Simple', {
    anyway: Fractale.with(undefined, {
        validator: (value) => value !== 'A value'
    }),
    mixed: Fractale.with(undefined, {
        validator: {
            in: ['foo', 'bar', 42]
        }
    }),
    number: Fractale.with(Number, {
        validator: {
            gt: 17,
            gte: 18,
            lt: 51,
            lte: 50,
            between: [18, 50]
        }
    }),
    date: Fractale.with(Date, {
        validator: {
            gt: '2019-11-17',
            gte: new Date('2019-11-18'),
            lte: moment('2019-11-20'),
            lt: moment(),
            between: [18] // If one value is between ... and today or today and ...
        }
    }),
    string: Fractale.with(String, {
        validator: {
            like: /bar$/
        }
    }),
});
```