Cannot access correct this inside an axios callback [duplicate]

Answer 1

The problem is not that the state doesn't exist, it is that you are not using the correct context for state.

You need to bind the axios callback function, otherwise this inside it will refer to its own context rather than that of the react component

axios.get(//url//)
  .then( (response) => {
    this.setState({data: response.data});
  })
  .catch( (error) => {
    console.log(error);
  })

and in render

render() {
    return (
      <ul>
        {this.state.data.map(v => <li key={v.id}>{v.body}</li>)}
      </ul>
    )

  };