I have a model in Blender, which I have tried to export into Adobe After Effects as .obj and adobe after effects file (.jsx). None of these open in After effects. Does anyone know how to export it?
After Effects is not a 3D program, therefore it can not import 3D objects by itself. There are 3rd party programs that can help import an OBJ file. One of the best is Element 3D by Video Copilot ($200). After Effects also comes with Cinema 4D lite which has built in pipeline for working with 3D. You could always export from Blender into Cinema 4D and then use the built in pipeline to get it into After Effects.
Hope this helps.
You Better Export Your Animation as Image Sequences and use EXtractoR Plugin... you can check this video too for further instructions https://www.youtube.com/watch?v=thc0-1ze8po