getPostsReduxAction.js

import axios from 'axios';

export const GET_POSTS_START = 'GET_POSTS_START';
export const GET_POSTS_SUCCESS = 'GET_POSTS_SUCCESS';
export const GET_POSTS_FAIL = 'GET_POSTS_FAIL';

const getPostsStart = () => ({
  type: GET_POSTS_START,
});

const getPostsSuccess = posts => ({
  type: GET_POSTS_SUCCESS,
  posts,
});

const getPostsFail = error => ({
  type: GET_POSTS_FAIL,
  error,
});

export const getPosts = () => (dispatch) => {
  dispatch(getPostsStart());

  return axios({
    url: `/api/posts`,
    method: 'get',
  })
    .then(res => {
      dispatch(getPostsSuccess(res.data));
      return res;
    })
    .catch(error => {
      dispatch(getPostsFail(error));
      return error;
    });
};