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Memento Project

Memento was a project of the United States National Digital Information Infrastructure and Preservation Program (NDIIPP). It was funded with the aim of making Web-archived content more easily discoverable and accessible to the public. The project concluded on 5 September 2025.

Technical description

Memento is defined in as an implementation of the time dimension of content negotiation. HTTP accomplishes negotiation of content using headers that allow clients and servers to find content that the user desires.

The header provided by HTTP does not necessarily reflect when a particular version of a web page came into existence. Also, the header may not exist in some cases. To provide more information, the header has been introduced to indicate when a specific representation of a web page was observed on the web.

Usage

Copies of page can be found by simply navigating, in a web browser, to a link formatted, replacing <code>urltoarchive</code> with the full URL of the page desired.

JSON description of a Memento:

  • <code><nowiki>http://timetravel.mementoweb.org/api/json/YYYY/</nowiki>urltoarchive</code>
  • <code><nowiki>http://timetravel.mementoweb.org/api/json/YYYYMM/</nowiki>urltoarchive</code>
  • <code><nowiki>http://timetravel.mementoweb.org/api/json/YYYYMMDD/</nowiki>urltoarchive</code>
  • <code><nowiki>http://timetravel.mementoweb.org/api/json/YYYYMMDDHH/</nowiki>urltoarchive</code>
  • <code><nowiki>http://timetravel.mementoweb.org/api/json/YYYYMMDDHHMM/</nowiki>urltoarchive</code>

Or redirect to a Memento with a datetime that is close to a desired datetime:

  • <code><nowiki>http://timetravel.mementoweb.org/memento/YYYY/</nowiki>urltoarchive</code>
  • <code><nowiki>http://timetravel.mementoweb.org/memento/YYYYMM/</nowiki>urltoarchive</code>
  • <code><nowiki>http://timetravel.mementoweb.org/memento/YYYYMMDD/</nowiki>urltoarchive</code>
  • <code><nowiki>http://timetravel.mementoweb.org/memento/YYYYMMDDHH/</nowiki>urltoarchive</code>
  • <code><nowiki>http://timetravel.mementoweb.org/memento/YYYYMMDDHHMM/</nowiki>urltoarchive</code>

References

External links