[
  {
    "language": "javascript",
    "fileExt": ".js",
    "repoUrl": "https://github.com/diff-fixtures/javascript.git",
    "syntaxes": [
      {
        "syntax": "object",
        "insert": "{ \"key1\": \"value1\" };",
        "replacement": "{ \"key1\": \"value1\", \"key2\": \"value2\", \"key3\": \"3.0\" };"
      }
    ]
  }
]