Reader aid items in this section

• REST API & Interactive Documentation

  eCFR data originates with the files used to produce the print and PDF editions. During the publication process these are transformed into bulk XML files made available by the Government Publishing Office (GPO). In order to create the point-in-time features of the eCFR we process these XML files into smaller units that we...

• Understanding eCFR Dates

  A request to the eCFR titles endpoint (documented as part of the interactive documentation) returns three date fields per title—latest_amended_on, latest_issue_date, and up_to_date_as_of—as well as additional fields. Understanding these date values is essential for interpreting the state of eCFR content and confidently...