input: from typing import List
  
  def list_all_countries_api(data: List[str]) -> str:
      """Create a basic REST API using Python and Flask to list all the countries in the world.
      The function should return the Flask API code that reads the list of countries from a JSON file.
      >>> list_all_countries_api([])
      'import flask\\nfrom flask import Flask, request, jsonify\\nimport json\\n\\napp = Flask(__name__)\\n\\n@app.route('/countries', methods=['GET'])\\ndef get_countries():\\n    with open('data.json', 'r') as f:\\n        countries = json.load(f)\\n    return jsonify(countries)\\n\\nif __name__ == \'__main__\':\\n    app.run()'
      """
output:     return f'import flask\nfrom flask import Flask, request, jsonify\nimport json\n\napp = Flask(__name__)\n\n@app.route(\'/countries\', methods=[\'GET\'])\ndef get_countries():\n    with open(\'data.json\', \'r\') as f:\n        countries = json.load(f)\n    return jsonify(countries)\n\nif __name__ == \'__main__\':\n    app.run()'