The After Effects Engine

The engine uses tk-framework-adobe to wrap the Javascript API to python. To get or set a variable or to call a method in javascript one may do so by using the engine’s “adobe” member.

An example:

Assuming Aftereffects has a comp-item selected. To get the layerName of the currently active comp item one can use the following python commands:

comp_item =
layer1 = comp_item.active_item.layers[1]

The Javascript equivalent to this would be:

var comp_item = app.project.active_item
var layer1 = comp_item.layers[1]


Everytime a datatype of an argument is describes as adobe.[…]Object it refers to the Adobe JavaScript equivalent.

To see the reference of the After Effects Javascript API please visit this link or download this pdf