handle login function

function handleLogin (){
    let user = {
       userName: 'Jhon Doe',
       email: 'jhondoe@gmial.com',
       password: 'superstar@123'
    }

    const BASE_URL = 'http://localhost:3000/api/v1'
    
    fetch(BASE_URL + '/users/login', {
        method: 'POST',
        headers: {
        'Content-Type': 'application/json'
     },
        body: JSON.stringify(user)
     })
     
     //here we are getting the response and converting that response into json format.
    .then(res => res.json())
    .then(data => {
        // we get data over here and we can use it now
        console.log(data, 'user login data');
        if (data.success) {
            sending data to reducer
            this.props.dispatch({ type: 'LOGIN', payload: data });
        } else if (!data.success) {
            console.log('login user unsuccessfull...');
            this.props.history.push('/users/login');
        }
    })
    .catch(err => {
       console.log(err, 'login user catch err...');
    });
};