I would like to add a section on my website (Drupal 7) which consists of articles with external links (as source). To avoid spam and duplicated content, I would like to avoid that users may add a URL more than one time. Basically, I need something which checks if the external URL is unique and not being used more than once.

I've looked for modules on Drupal.org, and tried googling some information. But I couldn't really find a solution. The Link checker module seems fine for checking if the URL is still available, but it doesn't avoid the same URL is used more than once.

1 Answer 1


You should take a look at the Unique Field module:

This module performs additional validation when a node is created or updated by a user to require that a node's title, author, language, and CCK fields are unique within a given context.

  • Considering the module has a setting for the scope of the unique values (e.g. content type, all nodes, the single node), this is the module I would suggest too.
    – apaderno
    Commented Nov 25, 2012 at 21:30
  • Bit of a shame that I didn't looked into that direction. Anyway I did some testing seems to do the job so far, thanks for your help!
    – Avelino
    Commented Nov 27, 2012 at 14:56

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