input: 
  def fetch_data_from_sql_as_json() -> str:
      """ Fetches data from an SQL database and presents the data in the form of a JSON using a Flask API.
      >>> fetch_data_from_sql_as_json()
      '[{"id": 1, "name": "Alice"}, {"id": 2, "name": "Bob"}]'
      """
      import json 
      import sqlite3
      from flask import Flask, request, jsonify 
  
      app = Flask(__name__) 
    
      def dict_factory(cursor, row):
          d = {}
          for idx, col in enumerate(cursor.description):
              d[col[0]] = row[idx]
          return d 
    
      @app.route('/', methods=['GET'])
      def index(): 
          connection = sqlite3.connect('database.db')
          connection.row_factory = dict_factory
          cur = connection.cursor() 
          all_users = cur.execute('SELECT * FROM users;').fetchall() 
          return jsonify(all_users) 
    
      if __name__ == '__main__': 
          app.run(debug = True)
      
      return json.dumps(all_users)
  
output:     import json 
      import sqlite3
      from flask import Flask, request, jsonify 
  
      app = Flask(__name__) 
    
      def dict_factory(cursor, row):
          d = {}
          for idx, col in enumerate(cursor.description):
              d[col[0]] = row[idx]
          return d 
    
      @app.route('/', methods=['GET'])
      def index(): 
          connection = sqlite3.connect('database.db')
          connection.row_factory = dict_factory
          cur = connection.cursor() 
          all_users = cur.execute('SELECT * FROM users;').fetchall() 
          return jsonify(all_users) 
    
      if __name__ == '__main__': 
          app.run(debug = True)
      
      with app.test_client() as client:
          response = client.get('/')
          return response.get_data(as_text=True)