Display customized images
With image optimization and art direction in mind, let’s go through how to display customized images in your app so that they appear just as content creators intended.
How customized images are stored
Behind the scenes, customized images are stored as asset renditions with metadata describing how to transform the original image. The following JSON example from Delivery API shows an asset element containing the image. Notice therenditions property in the asset’s value, which specifies how to customize the image.
{
"type": "asset",
"name": "Image",
"value": [
{
"name": "iStock-1140334771.jpg",
"description": null,
"type": "image/jpeg",
"size": 4858659,
"url": "https://assets-us-01.kc-usercontent.com/40886722-9bde-00cb-08d7-36b32d4a6d7b/9858cb0a-46de-4d5e-8970-42222e35463d/iStock-1140334771.jpg",
"width": 3863,
"height": 2578,
"renditions": {
"default": {
"rendition_id": "7618a0e0-ce51-4748-b404-e0b828861c69",
"preset_id": "a6d98cd5-8b2c-4e50-99c9-15192bce2490",
"width": 1600,
"height": 1200,
"query": "w=1600&h=1200&fit=clip&rect=1539,0,1600,1200"
}
}
}
]
}query to the asset’s url.
Display customized images
When you get a content item with an asset element, check if the asset element specifies an asset rendition and then apply the rendition. Content creators can create only a single customization per image, so it’s safe to use the default rendition for all images.
The JavaScript SDK can apply asset renditions automatically for you. To automatically use the default asset rendition, provide the 
when initializing the Delivery client.
defaultRenditionPreset configuration option when initializing the Delivery client.// Tip: Find more about JS/TS SDKs at https://kontent.ai/learn/javascript
import { createDeliveryClient } from '@kontent-ai/delivery-sdk';
// Specifies which asset rendition to use by default by providing defaultRenditionPreset
const deliveryClient = createDeliveryClient({
environmentId: 'KONTENT_AI_ENVIRONMENT_ID',
// Automatically applies the 'default' asset rendition if assets specify it
defaultRenditionPreset: 'default'
});
// Requests a content item
const response = await deliveryClient.item('my_article')
.toPromise();
// Gets the first asset in the 'teaser_image' asset element
const asset = response.data.item.elements.teaser_image.value[0];
// Gets the asset's URL. If the asset specifies a rendition, it's automatically applied.
const assetUrl = asset.url;
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