"smd components cant wire on top layer and switch to bootm layer" Route to a via then swap to bottom layer. Start the trace on your desired layer; left click once to end the track on that layer; press the letter or number key for the layer you want to swap the trace routing to (in your case if you started at J1 pin 4 on the Bottom layer you would press the T key to swap to the Top layer); A via will appear; Do not click anything: just continue routing on the new layer and end routing in the normal way adding more vias in the same way if required. [https://docs.easyeda.com/en/PCB/Route/index.html#Route-Tracks](https://docs.easyeda.com/en/PCB/Route/index.html#Route-Tracks)

View from bottom of PCB: Please see: [https://easyeda.com/forum/topic/possibility-to-choose-the-point-of-view-from-bottom-layer-or-from-top-layer-205d6e036743446d83b4d0cd87e27bef](https://easyeda.com/forum/topic/possibility-to-choose-the-point-of-view-from-bottom-layer-or-from-top-layer-205d6e036743446d83b4d0cd87e27bef)

photo view is just to preview the pcb i've understood, i want to see pcb from underside when wireing. all the components are mirrored accordiing too the datasheets when looking from the top.

Hi EasyEDA doesn't support to flip the bottom view yet. Thanks

@UserSupport oh okay then

Would be nice to have a key for placing a via while routing. Maybe there is, I don't know. When drawing a trace, pressing for example V would place a via belonging to the same net as the trace you're drawing to the location of the last clicked trace point or where the cursor currently is. Now you need to end the trace, create a via, then you try to route to that via and realize it won't connect because it's not in the same net and then you need to change the via's net. Of course more experienced designers probably decide before routing that this trace is going through a via and place them accordingly beforehand.

@kimmo.lehto, [https://docs.easyeda.com/en/PCB/Route/index.html](https://docs.easyeda.com/en/PCB/Route/index.html)