| I need to know if its possible to print only the required key, for eg: i need nodes with add:street key , but what i want in the output is only that addr:street key not other tags like name,addr:city etc. asked 04 Feb '16, 13:10 Arun Gowtham | 
One Answer:
| out:csv is one way to do this. Something like (untested)  For ways and relations,  answered 04 Feb '16, 13:35 maxerickson | 

@maxerickson Is there any workaround for JSON format?
Not that I know of. I guess it is easy enough to do on the client side that filtering tags isn't a high priority.