Ionic 4 json data pull

export class BtcService {
	  public todos: todo[] = [];

	constructor () {
		    // Set some test todos
    this.todos = [
      { id: 'todo-one', title: 'Todo One', description: 'Do Stuff' },
      { id: 'todo-two', title: 'Todo Two', description: 'Do Stuff' },
      { id: 'todo-three', title: 'Todo Three', description: 'Do Stuff' },
      { id: 'todo-four', title: 'Todo Four', description: 'Do Stuff' },
      { id: 'todo-five', title: 'Todo Five', description: 'Do Stuff' },
      { id: 'todo-six', title: 'Todo Six', description: 'Do Stuff' },
      { id: 'todo-seven', title: 'Todo Seven', description: 'Do Stuff' }
    ];

  }

like this
how same json data pull ??? https://api.coinmarketcap.com/v1/ticker/