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What is the difference between user_id and account_id in the User object ? Both are different and I'm looking for the unique ID of the User.

  "items": [
      "user_id": 2144246,
      "user_type": "registered",
      "creation_date": 1362659682,
      "display_name": "Tony",
      "profile_image": "",
      "reputation": 68,
      "reputation_change_day": 0,
      "reputation_change_week": 0,
      "reputation_change_month": 15,
      "reputation_change_quarter": 25,
      "reputation_change_year": 67,
      "last_access_date": 1377435062,
      "last_modified_date": 1377018698,
      "is_employee": false,
      "link": "",
      "website_url": "",
      "account_id": 2417804,
      "badge_counts": {
        "gold": 0,
        "silver": 0,
        "bronze": 5
  "quota_remaining": 9999,
  "quota_max": 10000,
  "has_more": false
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up vote 4 down vote accepted

The user_id is the per-site user id (in the above case, for Stack Overflow). The account_id is the global Stack Exchange account id (i.e. the id of your Stack Exchange account).

The account_id is probably the best key if you're looking for a global identifier, since the individual per-site user ids will be different on each site the account is associated with.

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