Fetching select attributes from Google Contact API - google-contacts-api

Question

While working with https://developers.google.com/google-apps/contacts/v3/reference, I haven't figured out a way yet to ONLY have Google return gd$email & gd$name instead of the following it returns by default.
["id", "gd$etag", "updated", "app$edited", "category", "title", "link", "gd$email", "gd$name"]
For our business use case, we only need these two attributes, having all the above in the response increases the response Pay Load and thus response time.
Any leads ?

Answer 1

You can change the response you get with contacts API. I tried for retrieving all the contacts, but to include only email and phone number in the response.
Here is the request https://www.google.com/m8/feeds/contacts/guntupalliswathi#gmail.com/full ?fields=entry/gd:email,entry/gd:phoneNumber(I tried in oauth playground)
Response:
<entry>
<gd:email rel="http://schemas.google.com/g/2005#other" address="xxxx#domain.com" primary="true"/>
</entry>
<entry>
<gd:phoneNumber rel="http://schemas.google.com/g/2005#mobile" uri="tel:[phone]"> </gd:phoneNumber>
</entry>
<entry>
<gd:email rel="http://schemas.google.com/g/2005#other" address="yyyy#domain.com" primary="true"/>
</entry>
<entry>
<gd:phoneNumber rel="http://schemas.google.com/g/2005#mobile">[phone]</gd:phoneNumber>
</entry>
Let me know if your issue is not resolved.

Answer 2

For JSON response, you can supply field list as follows:
https://www.google.com/m8/feeds/contacts/default/full/?alt=json&fields=feed(entry(gd$name(gd$fullName))),feed(entry(gd$email(address)))
This will give you just full name and email per contact. Hope this works.