Here maps added autocomplete function to its geocoder api
http://autocomplete.geocoder.cit.api.here.com/6.2/suggest.json
?app_id={YOUR_APP_ID}
&app_code={YOUR_APP_CODE}
&query=Pariser+1+Berl
&beginHighlight=<b>
&endHighlight=</b>
It is complete new and not well documented right now. I do not know how to call it with js api. Do anybody use it with the js api or know how to use it with js api?
Most js api acts as wrapper class for geocorder, so i want to prefer using existing wrapper before building my own.
There is now a project to wrap the HERE Maps JS API, you can find it on NPM here:
https://www.npmjs.com/package/node-heremaps
If you're looking to display maps in the browser, I've started working on a project for a React integration here:
https://www.npmjs.com/package/react-here-maps
And you can of course just include the HERE Maps script directly.