"just kidding" meaning in English

{
  "head_templates": [
    {
      "args": {},
      "expansion": "just kidding",
      "name": "en-interj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "I wasn't serious; it was only a joke."
      ],
      "id": "en-just_kidding-en-intj-hlwHgv1v",
      "links": [
        [
          "serious",
          "serious"
        ],
        [
          "joke",
          "joke"
        ]
      ],
      "raw_glosses": [
        "(informal) I wasn't serious; it was only a joke."
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "word": "just kidding"
}

{
  "head_templates": [
    {
      "args": {},
      "expansion": "just kidding",
      "name": "en-interj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English informal terms",
        "English interjections",
        "English lemmas",
        "English multiword terms"
      ],
      "glosses": [
        "I wasn't serious; it was only a joke."
      ],
      "links": [
        [
          "serious",
          "serious"
        ],
        [
          "joke",
          "joke"
        ]
      ],
      "raw_glosses": [
        "(informal) I wasn't serious; it was only a joke."
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "word": "just kidding"
}