Instagram Username Lookup (by User ID)

{
  "type": "object",
  "required": [
    "user_id"
  ],
  "properties": {
    "user_id": {
      "type": "string",
      "examples": [
        "18527"
      ],
      "description": "Numeric Instagram user id to resolve to a username."
    }
  },
  "additionalProperties": false
}

{
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "description": "The queried account's own numeric Instagram user id, echoed back as a string."
    },
    "username": {
      "type": "string",
      "description": "The account's current public username (handle), e.g. \"instagram\"."
    },
    "profile_pic_url": {
      "type": [
        "string",
        "null"
      ],
      "description": "The account's public profile picture URL. Value withheld (stripped to `null`) in this tool's output -- only whether a profile picture is set is observable, not the image itself."
    }
  },
  "description": "The account record, as returned at routing.responseResultPath ($.output). Observed as an empty object `{}` when the given `user_id` does not resolve to an existing Instagram account -- confirmed against the `invalid-user-id-not-found` fixture, which was NOT billed (cost 0, billedUnits 0) unlike the found case.",
  "additionalProperties": true
}