Chat/src/reducers/auth.js

import { decode as atob } from 'base-64';

function authReducer(state, { type, token }) {
    if (state === undefined) {
        if (localStorage.authToken) {
            type = "LOGIN"
            token = localStorage.authToken
        } else {
            return {}
        }
    }

    if (type === "LOGIN") {
        localStorage.authToken = token
        return { token, payload: JSON.parse(atob(token.split(".")[1])) }
    }
    if (type === "LOGOUT") {
        localStorage.removeItem("authToken")
        return {}
    }
    return state
}

export default authReducer