# Update sync list item

**POST /v1/Services/{ServiceSid}/Lists/{ListSid}/Items/{Index}**


Items in a sync list

## Servers
- https://sync.twilio.com: https://sync.twilio.com ()


## Authentication methods
- Account sid auth token


## Parameters
### Headers
- **If-Match** (string)
  If provided, applies this mutation if (and only if) the “revision” field of this [map item] matches the provided value. This matches the semantics of (and is implemented with) the HTTP [If-Match header](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-Match).

### Path parameters
- **ServiceSid** (string)
  The SID of the [Sync Service](https://www.twilio.com/docs/sync/api/service) with the Sync List Item resource to update.
- **ListSid** (string)
  The SID of the Sync List with the Sync List Item resource to update. Can be the Sync List resource's `sid` or its `unique_name`.
- **Index** (integer)
  The index of the Sync List Item resource to update.


### Body: application/x-www-form-urlencoded (object)

- **Data** ()
  A JSON string that represents an arbitrary, schema-less object that the List Item stores. Can be up to 16 KiB in length.
- **Ttl** (integer)
  An alias for `item_ttl`. If both parameters are provided, this value is ignored.
- **ItemTtl** (integer)
  How long, [in seconds](https://www.twilio.com/docs/sync/limits#sync-payload-limits), before the List Item expires (time-to-live) and is deleted.
- **CollectionTtl** (integer)
  How long, [in seconds](https://www.twilio.com/docs/sync/limits#sync-payload-limits), before the List Item's parent Sync List expires (time-to-live) and is deleted. This parameter can only be used when the List Item's `data` or `ttl` is updated in the same request.


## Responses
### 200
OK
#### Headers
- **ETag** (string)

- **Access-Control-Allow-Origin** (string)
  Specify the origin(s) allowed to access the resource
- **Access-Control-Allow-Methods** (string)
  Specify the HTTP methods allowed when accessing the resource
- **Access-Control-Allow-Headers** (string)
  Specify the headers allowed when accessing the resource
- **Access-Control-Allow-Credentials** (boolean)
  Indicates whether the browser should include credentials
- **Access-Control-Expose-Headers** (string)
  Headers exposed to the client

#### Body: application/json (object)
- **index** (integer)
  The automatically generated index of the List Item. The `index` values of the List Items in a Sync List can have gaps in their sequence.
- **account_sid** (string | null)
  The SID of the [Account](https://www.twilio.com/docs/iam/api/account) that created the List Item resource.
- **service_sid** (string | null)
  The SID of the [Sync Service](https://www.twilio.com/docs/sync/api/service) the resource is associated with.
- **list_sid** (string | null)
  The SID of the Sync List that contains the List Item.
- **url** (string(uri) | null)
  The absolute URL of the List Item resource.
- **revision** (string | null)
  The current revision of the item, represented as a string.
- **data** (object | null)
  An arbitrary, schema-less object that the List Item stores. Can be up to 16 KiB in length.
- **date_expires** (string(date-time) | null)
  The date and time in GMT when the List Item expires and will be deleted, specified in [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) format. If the List Item does not expire, this value is `null`. The List Item resource might not be deleted immediately after it expires.
- **date_created** (string(date-time) | null)
  The date and time in GMT when the resource was created specified in [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) format.
- **date_updated** (string(date-time) | null)
  The date and time in GMT when the resource was last updated specified in [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) format.
- **created_by** (string | null)
  The identity of the List Item's creator. If the item is created from the client SDK, the value matches the Access Token's `identity` field. If the item was created from the REST API, the value is `system`.


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