How to get value from Multiple Checkbox to array in react?

Question

onToggle(index, e){

    let newItems = this.state.items.slice();

    newItems[index].checked = !newItems[index].checked

    this.setState({

      items: newItems

    })

  }

 <div>

          <ul>

            {this.state.GroupList.map((item, i) =>

              <li key={i}>

                {item.Name}

                <input type="checkbox" onChange={this.onToggle.bind(this, i)} />

              </li>

            )}

          </ul>

          <br/>

          You checked: {JSON.stringify(this.state.GroupList.filter(item => item.checked))}

        </div>

Here checked value is displayed but i want only the text "Hello"