# Custom Object (JSON)

Defining a field as a Custom object allows you to enter field values as raw JSON.\
\
As long as you adhere to valid JSON syntax, you are free to define anything you like in your very own structure.\
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If you have a JSON field with this content:

```json
{
  "make": "Audi",
  "model": "RS6" 
}
```

you can use it directly in Liquid:

```liquid
{% assign car = product.metafields.accentuate.specs %}

<p>My car is the brand new {{ car.make }} {{ car.model }}</p>
```

If you need the custom field as a client-side Javascript variable, you can use the JSON filter:

```javascript
<script>
  let car = {{ product.metafields.accentuate.specs | json }}
  alert('My car is the brand new ' + car.make + ' ' + car.model);
</script>
```

### Restrictions&#x20;

JSON objects can be as simple or as complex as you need **but** if you need to create an array of JSON objects, either use repeatable fields (see separate article) or define the array as a property within the JSON object.\
\
An **outer-most array is reserved** for ACF's handling of repeatable JSON fields.\
\
So while this works well:

```json
{
  "colors": ["Red", "Blue", "Green"]
}
```

this will cause ACF to split the values after you save them

```liquid
["Red", "Blue", "Green"]
```