# Expansions and Fields

## expansions

Expansions enable you to request additional data objects that relate to the originally returned List, Space, Tweets, or users. Submit a list of desired expansions in a comma-separated list without spaces. The ID that represents the expanded data object will be included directly in the List, Space, Tweet, or user data object, but the expanded object metadata will be returned within the includes response object, and will also include the ID so that you can match this data object to the original Space, Tweet, or user object.

At this time, the only expansion available to endpoints that primarily return List objects is expansions=owner_id. You will find the expanded user data object living in the includes response object.

For methods that return Spaces, the following data objects can be expanded using this parameter:

• The Spaces creator’s user object

• The user objects of any Space co-host

• Any mentioned users’ object

• Any speaker’s user object

For methods that return Tweets, the following data objects can be expanded using this parameter:

• The Tweet author’s user object

• The user object of the Tweet’s author that the original Tweet is responding to

• Any mentioned users’ object

• Any referenced Tweets’ author’s user object

• Attached media’s object

• Attached poll’s object

• Attached place’s object

• Any referenced Tweets’ object

At this time, the only expansion available to endpoints that primarily return user objects is expansions=pinned_tweet_id. You will find the expanded Tweet data object living in the includes response object.

## list_fields

This fields parameter enables you to select which specific List fields will deliver with each returned List objects. Specify the desired fields in a comma-separated list without spaces between commas and fields. These specified List fields will display directly in the List data objects.

## media_fields

This fields parameter enables you to select which specific media fields will deliver in each returned Tweet. Specify the desired fields in a comma-separated list without spaces between commas and fields. The Tweet will only return media fields if the Tweet contains media and if you’ve also included the expansions=attachments.media_keys query parameter in your request. While the media ID will be located in the Tweet object, you will find this ID and all additional media fields in the includes data object.

## place_fields

This fields parameter enables you to select which specific place fields will deliver in each returned Tweet. Specify the desired fields in a comma-separated list without spaces between commas and fields. The Tweet will only return place fields if the Tweet contains a place and if you’ve also included the expansions=geo.place_id query parameter in your request. While the place ID will be located in the Tweet object, you will find this ID and all additional place fields in the includes data object.

## poll_fields

This fields parameter enables you to select which specific poll fields will deliver in each returned Tweet. Specify the desired fields in a comma-separated list without spaces between commas and fields. The Tweet will only return poll fields if the Tweet contains a poll and if you’ve also included the expansions=attachments.poll_ids query parameter in your request. While the poll ID will be located in the Tweet object, you will find this ID and all additional poll fields in the includes data object.

## space_fields

This fields parameter enables you to select which specific Space fields will deliver in each returned Space. Specify the desired fields in a comma-separated list.

## tweet_fields

For methods that return Tweets, this fields parameter enables you to select which specific Tweet fields will deliver in each returned Tweet object. Specify the desired fields in a comma-separated list without spaces between commas and fields. You can also pass the expansions=referenced_tweets.id expansion to return the specified fields for both the original Tweet and any included referenced Tweets. The requested Tweet fields will display in both the original Tweet data object, as well as in the referenced Tweet expanded data object that will be located in the includes data object.

For methods that return users, this fields parameter enables you to select which specific Tweet fields will deliver in each returned pinned Tweet. Specify the desired fields in a comma-separated list without spaces between commas and fields. The Tweet fields will only return if the user has a pinned Tweet and if you’ve also included the expansions=pinned_tweet_id query parameter in your request. While the referenced Tweet ID will be located in the original Tweet object, you will find this ID and all additional Tweet fields in the includes data object.

## user_fields

For methods that return Spaces or Tweets, this fields parameter enables you to select which specific user fields will deliver in each returned Space or Tweet. Specify the desired fields in a comma-separated list without spaces between commas and fields. While the user ID will be located in the original Tweet object, you will find this ID and all additional user fields in the includes data object.

You must also pass one of the user expansions to return the desired user fields:

• expansions=author_id

• expansions=entities.mentions.username

• expansions=in_reply_to_user_id

• expansions=referenced_tweets.id.author_id

For methods that return users, this fields parameter enables you to select which specific user fields will deliver with each returned users objects. Specify the desired fields in a comma-separated list without spaces between commas and fields. These specified user fields will display directly in the user data objects.