Here is the problem, I have a Google Chrome extension and I want to use the BOSS API in it. The problem is that I do not know if it is possible to use the API without a webserver running.
The documentation does not provide any example using JavaScript. Thus my question:
Is it possible to use the Yahoo BOSS OAuth with JavaScript only?
Probably not...
All the examples Yahoo provides are using server side languages
http://developer.yahoo.com/boss/search/boss_api_guide/codeexamples.html
First you'd have to figure out how to use OAuth with JavaScript, and how will you obscure your API keys from users in a JS File? If you don't have to worry about that, say you are just using this for personal use. Maybe check out the code sample for Node.JS and modify it for your own uses.
http://developer.yahoo.com/boss/search/boss_api_guide/codeexamples.html#oauth_js