Do you mean to say how do I use this stuff?

You can find the documentation [here][1] or there's a Get Started section at the right of this page.


For example if you want to see a list of users you could send a web request to http://api.stackoverflow.com/1.0/users and parse then JSON response.

Now if you want to find out details about a particular user lets say your details http://stackoverflow.com/users/566610/jared

Do you see the number 566610 thats the id. Every question, answer, comment ,or user has a id.

So here you need to send your web request to http://api.stackoverflow.com/1.0/users/566610

**Your JSON response :** 

    {
      "total": 1,
      "page": 1,
      "pagesize": 30,
      "users": [
        {
          "user_id": 566610,
          "user_type": "registered",
          "creation_date": 1294388578,
          "display_name": "Jared",
          "reputation": 28,
          "email_hash": "e51f7fdd3c09fc9246278abf89f1881e",
          "age": 19,
          "last_access_date": 1294538702,
          "website_url": "http://wphax.com",
          "location": "Wisconsin, US",
          "about_me": "<p>Freelance WordPress Expert</p>\n",
          "question_count": 2,
          "answer_count": 2,
          "view_count": 1,
          "up_vote_count": 0,
          "down_vote_count": 0,
          "association_id": "d0249d62-3c97-4b50-9df1-8c7f377846f6",
          "user_questions_url": "/users/566610/questions",
          "user_answers_url": "/users/566610/answers",
          "user_favorites_url": "/users/566610/favorites",
          "user_tags_url": "/users/566610/tags",
          "user_badges_url": "/users/566610/badges",
          "user_timeline_url": "/users/566610/timeline",
          "user_mentioned_url": "/users/566610/mentioned",
          "user_comments_url": "/users/566610/comments",
          "user_reputation_url": "/users/566610/reputation",
          "badge_counts": {
            "gold": 0,
            "silver": 0,
            "bronze": 4
          }
        }
      ]
    }

Take one more example. Lets assume we want to find out list of questions for this you should send your web request to http://api.stackoverflow.com/1.0/questions

and if you want questions related to a particular tag for example wordpress

your url will be http://api.stackoverflow.com/1.0/questions?tagged=wordpress

And once you have finished with your application you can register for an [API key][2].

Read [How API Keys Work][3] for more details.

-----

**Edit :** 

You can use [StackAPI][4] which is an interactive way to explore the API of the stack family of sites. 

I hope this helps.


  [1]: http://api.stackoverflow.com/1.0/help
  [2]: http://stackapps.com/apps/register
  [3]: http://stackapps.com/questions/67/how-api-keys-work
  [4]: http://stackapps.com/questions/595/stackapi-com-stack-api-explorer