gistfile1.js

// GET http://localhost:5984/blog/_view/articles/tags?group=true&group_level=1

{"rows":[
  {"key":"awesome","value":1},
  {"key":"agile","value":2},
  {"key":"ajax","value":2},
  {"key":"apache","value":2},
  {"key":"api","value":1},
  {"key":"caching","value":1},
  {"key":"coding","value":7},
  {"key":"conference","value":1},
  // and so on ...
]}