"よくやった" meaning in Japanese

{
  "forms": [
    {
      "form": "yoku yatta",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "interjection",
        "2": "よく やった"
      },
      "expansion": "よくやった • (yoku yatta)",
      "name": "ja-pos"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese phrasebook",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "well done; good job"
      ],
      "id": "en-よくやった-ja-intj-9LXZJUrP",
      "synonyms": [
        {
          "roman": "yoku dekimashita",
          "word": "よくできました"
        }
      ]
    }
  ],
  "word": "よくやった"
}

{
  "forms": [
    {
      "form": "yoku yatta",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "interjection",
        "2": "よく やった"
      },
      "expansion": "よくやった • (yoku yatta)",
      "name": "ja-pos"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        "Japanese entries with incorrect language header",
        "Japanese entries with language name categories using raw markup",
        "Japanese hiragana",
        "Japanese interjections",
        "Japanese lemmas",
        "Japanese links with redundant wikilinks",
        "Japanese phrasebook",
        "Japanese terms with redundant sortkeys"
      ],
      "glosses": [
        "well done; good job"
      ]
    }
  ],
  "synonyms": [
    {
      "roman": "yoku dekimashita",
      "word": "よくできました"
    }
  ],
  "word": "よくやった"
}

{
  "called_from": "parser/1336",
  "msg": "no corresponding start tag found for </span>",
  "path": [
    "よくやった"
  ],
  "section": "Japanese",
  "subsection": "interjection",
  "title": "よくやった",
  "trace": ""
}