Updating Entry field with GraphQL mutation
To edit an entry via a GraphQL mutation you will need to pass the id of the entry you want to edit (similar to front end entry form).
This example assumes a news Section, an article Entry Type and will update the entry title.
Mutation
mutation MyMutation($id: ID = &quot;&quot;, $title: String = &quot;&quot;) {
  save_news_article_Entry(id: $id, title: $title) {
    id
    title
  }
}

Query variables
{
  &quot;id&quot;: &quot;12345&quot;,
  &quot;title&quot;: &quot;My title update&quot;
}