Starting from February 1st, 2020, it will no longer possible to directly create, duplicate, update or delete modular block items using the following endpoints:

• POST /items

• PUT /items/:id

• POST /items/:id/duplicate

• DELETE /items/:id

• DELETE /items/

The only supported way to perform any operation on modular block items will be by updating a modular content field on the parent item.

For example, to create an item with two modular blocks inside its modular content field:

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import { SiteClient, buildModularBlock } from 'datocms-client';
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const client = new SiteClient('YOUR_TOKEN');
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client.items.create({
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  itemType: '111',
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  content: [
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    buildModularBlock(text: "Foo", itemType: '222'),
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    buildModularBlock(text: "Bar", itemType: '222'),
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  ]
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})

This change is required to ensure atomic, reliable operations on content.