appComponent.js

@Component
class App extends Vue {
  // ...
  decodeData(data) {
    try {
      this.decodedData = atob(data) // can throw DOMException
    } catch(error) {
      Toast.error(error.message)
    }
  }
  async getData() {
    try {
      this.data = await api.getData() // can throw Error
    } catch(error) {
      Toast.error(error.message)
    }
  }
}