Janazah Prayer is regarded as Farz e Kifaya, if some people perform the prayer the obligation is accomplished. However, if no one performs the prayer, then all will be accountable for the negligence.
Here is Dua and Pray of Janazah Prayer that recites in the last takbeer of Janazah Prayer when we perform during the funeral.
"O Allah! Forgive all of our living ones and all the dead ones, and all those who are present and all those who are not present, and all our young ones and all our elderly ones, and all our men and all our women. Yā Allah! Whomever you keep alive from among us, keep him alive in Islam, and whomever of us you make die, make him die with faith."
Dua of Janazah funeral Prayer - Arabic Roman
Allah hummag fir le hayyena, wa mayyetena, wa shaaedena, wa gaaebena, wa sagheerena, wa kabirena ,wa zakarena ,wa unsana , Allah humma man aah yaiytahu , minna fa aah yehi alal Islam .Waman tawaf faiytahu minna fata waffahu alal Iman.
It is a useful information that we should be told by our elders and it is nice to see such things on webs
Mashallah Azzawajal this is very useful for us May Allah Subhanahu Ta'ala grant your efforts.Ameen.