flickrex

{
  "stat": "ok",
  "method": {
    "response": {
      "_content": "<user id=\"12037949632@N01\">\n\t<username>Stewart</username> \n</user>"
    },
    "requiredperms": 0,
    "needssigning": 0,
    "needslogin": 0,
    "name": "flickr.urls.lookupUser",
    "description": {
      "_content": "Returns a user NSID, given the url to a user's photos or profile."
    }
  },
  "errors": {
    "error": [
      {
        "message": "User not found",
        "code": "1",
        "_content": "The passed URL was not a valid user profile or photos url."
      },
      {
        "message": "Invalid API Key",
        "code": 100,
        "_content": "The API key passed was not valid or has expired."
      },
      {
        "message": "Service currently unavailable",
        "code": 105,
        "_content": "The requested service is temporarily unavailable."
      },
      {
        "message": "Write operation failed",
        "code": 106,
        "_content": "The requested operation failed due to a temporary issue."
      },
      {
        "message": "Format \"xxx\" not found",
        "code": 111,
        "_content": "The requested response format was not found."
      },
      {
        "message": "Method \"xxx\" not found",
        "code": 112,
        "_content": "The requested method was not found."
      },
      {
        "message": "Invalid SOAP envelope",
        "code": 114,
        "_content": "The SOAP envelope send in the request could not be parsed."
      },
      {
        "message": "Invalid XML-RPC Method Call",
        "code": 115,
        "_content": "The XML-RPC request document could not be parsed."
      },
      {
        "message": "Bad URL found",
        "code": 116,
        "_content": "One or more arguments contained a URL that has been used for abuse on Flickr."
      }
    ]
  },
  "arguments": {
    "argument": [
      {
        "optional": 0,
        "name": "api_key",
        "_content": "Your API application key. <a href=\"/services/api/misc.api_keys.html\">See here</a> for more details."
      },
      {
        "optional": "0",
        "name": "url",
        "_content": "The url to the user's profile or photos page."
      }
    ]
  }
}