How can I add a Preview in JSON local task?

My link is exactly the same of entity.node.canonical, but I have to add a query string (?_format=json). I know how to add the local task, but I don't know how to append the query string to the URL.

1 Answer 1


You need to configure URL options in links.task.yml file. See Url::fromUri for details.

  title: Export
  route_name: entity.node.canonical
    query: {_format: json}
  base_route: entity.node.canonical

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