devicelog_15.js

# terminal:
$npm install axios

import axios from 'axios';

...

onSubmit(e){
    e.preventDefault();
    const device = {
        accountname: this.state.accountname,
        description: this.state.description,
        duration: this.state.duration,
        date: this.state.date
    };

    axios.post('http://52.198.4.100:5000/devices/add', device)
    .then(res => console.log(res.data));
};