# Service Region index file for AWS services
<a name="service-region-index-file-for-service"></a>


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To understand the service version index file for AWS services, see the following references:

**Contents**
+ [Example: Service Region index file for an AWS service](#service-region-index-file-for-service)
+ [Service Region index definitions](#service-region-index-definitions-services)

## Example: Service Region index file for an AWS service
<a name="service-region-index-file-for-service"></a>

The service Region index file for an AWS service looks like the following.

```
{
   "formatVersion":"The version number for the service region index format",
   "disclaimer":"The disclaimers for this service region index",
   "publicationDate":"The publication date of this service region index",
   "regions":{
      "firstRegion":{
         "regionCode":"A unique identifier that identifies this region",
         "currentVersionUrl":"The relative URL for the service regional price list file of this version"
      },
      "secondRegion":{
         "regionCode": ...,
         "currentVersionUrl": ...
      },
      ...
   }
}
```

## Service Region index definitions
<a name="service-region-index-definitions-services"></a>

The following list defines the terms in the service Region index file.

**formatVersion**  
An attribute that tracks which format version the service Region index file is in. The `formatVersion` of the file is updated when the structure is changed. For example, the version will change from `v1` to `v2`.

**disclaimer**  
Any disclaimers that apply to the service Region index file.

**publicationDate**  
The date and time in UTC format when a service Region index file was published. For example, `2023-03-28T23:47:21Z`.

**regions**  
The list of available AWS Region for the AWS service.

**regions:regionCode**  
A unique code for the Region in which this AWS service is offered. This is used as the lookup key in the Regions list. For example, `us-east-2` is the US East (Ohio) Region.

**regions:regionCode:currentVersionUrl**  
The relative URL for the service Region index file of this version. For example, `/offers/v1.0/aws/AmazonRDS/20230328234721/us-east-2/index.json`.