> For the complete documentation index, see [llms.txt](https://docs.oceanprotocol.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.oceanprotocol.com/developers/ddo.js/edit-fields.md).

# Edit DDO Fields

To edit fields in the DDO structure, DDO instance from `DDOManager` is required to call `updateFields` method which is present for all types of DDOs, but targets specific DDO fields, according to DDO's version.

**NOTE**: There are some restrictions that need to be taken care of before updating fields which do not exist for certain DDO.

For e.g. `deprecatedDDO`, the update on `services` key is not supported, because a `deprecatedDDO` is not supposed to store `services` information. It is design to support only: `id`, `nftAddress`, `chainId`, `indexedMetadata.nft.state`.

Supported fields to be updated are:

```javascript

export interface UpdateFields {
  id?: string;
  nftAddress?: string;
  chainId?: number;
  datatokens?: AssetDatatoken[];
  indexedMetadata?: IndexedMetadata;
  services?: ServiceV4[] | ServiceV5[];
  issuer?: string;
  proof?: Proof;
}
```

## Usage of Update Fields Function

Now let's use [DDO V4 example](/developers/ddo.js/instantiate-ddo.md#usage-examples), `DDOExampleV4` into the following javascript code, assuming `@oceanprotocol/ddo-js` has been installed as dependency before:

```javascript
const { DDOManager } = require ('@oceanprotocol/ddo-js');

const ddoInstance = DDOManager.getDDOClass(DDOExampleV4);
const nftAddressToUpdate = "0xfF4AE9869Cafb5Ff725f962F3Bbc22Fb303A8aD8"
ddoInstance.updateFields({ nftAddress: nftAddressToUpdate }) // It supports update on multiple fields
// The same script can be applied on DDO V5 and deprecated DDO from `Instantiate DDO section`.
```

**Execute script**

```bash
node update-ddo-fields.js
```


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.oceanprotocol.com/developers/ddo.js/edit-fields.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.