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title intro redirect_from versions autogenerated category
Unions
A union is a type of object representing many objects.
/v4/union
/v4/reference/union
fpt ghec ghes
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graphql
Explore the schema reference

About unions

A union is a type of object representing many objects.

For example, a field marked as an ProjectCardItem could be an Issue or a PullRequest because each of those objects can be inside a project card. Using a union instead of an object gives you flexibility.

For more information, see AUTOTITLE.

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