if page id

// Add to lib file (example ab-design.at)
lib.currentPageId = TEXT
lib.currentPageId.data = TSFE:id


<f:if condition="{f:cObject(typoscriptObjectPath:'lib.currentPageId')} == 55">
              <f:then>
                // something
              </f:then> <f:else>
                // something
              </f:else>
          </f:if>
          
          https://stackoverflow.com/questions/40088721/check-if-pid-of-current-page-is-x